Section 4    Fertilizers & Soil Amendments

4.1 General

The specifications of Section 4 shall apply to the composition and use of fertilizer, limestone, sulfur, gypsum, and compost intended for turfgrass seeding. All labor, equipment, and materials required for the completion of Section 4 shall be furnished by the seeding contractor, unless specified otherwise.

4.2 Fertilizer

4.2a Nitrogen, Phosphorus, Potassium and Sulfur Fertilizer Materials

Fertilizers which supply nitrogen, phosphorous, potassium, and sulfur for turfgrass seeding shall be uniform in composition, free flowing, and suitable for application with mechanized rotary spreaders, drop spreaders, hydraulic seeders, or other equipment capable of uniformly distributing fertilizer over the soil surface. Nitrogen, phosphorus, potassium, and sulfur fertilizers may include a single fertilizer compound and only one nutrient, or may include a combination of compounds which supply nitrogen, phosphorus, potassium, and sulfur. Such fertilizers shall be labeled according to Maryland fertilizer laws, and shall include the trade name of the product, the identity of the chemical ingredients of the product, and the guaranteed nutrient analysis of the product. The addition of nitrogen (N), phosphorus (P or P2O5 ), potassium (K or K2O), and Sulfur (S) to soils shall be in accordance with soil test results and the recommendations of the University of Maryland Soil Testing Laboratory, or another accredited soil testing laboratory, or the Maryland Cooperative Extension Service.

4.2b Nitrogen, Phosphorus, Potassium, and Sulfur Starter Fertilizer

.1. Definition. Starter fertilizer shall be defined as a general purpose fertilizer which is used at the time of seeding to enhance seedling establishment. Starter fertilizers typically include nitrogen, phosphorus, potassium, and may also include sulfur. The use of starter fertilizer is optional. Starter fertilizer may be used for turfgrass establishment in all sites, including sites where soil tests show no deficiency of nitrogen, phosphorus, potassium, or sulfur. Starter fertilizer may be applied up to 10 days before seeding, at the time of seeding, or up to 5 days after seeding operations are completed.

.2. Composition. Nitrogen, phosphorus, potassium, and sulfur may be applied separately or in any combination as a starter fertilizer at rates not to exceed 1.0 pound nitrogen (N) per 1000 ft2 (44 pounds N per acre) and 2.0 pounds phosphorus (P2O5) per 1000 ft2 (87 pounds P205 per acre) and 2.0 pounds potassium (K2O) per 1000 ft2 (87 pounds K20 per acre) and 0.5 pound sulfur (S) per 1000 ft2 (22 pounds S per acre). However, when compost is applied to the seeding site, the nutrient contribution of the compost shall be subtracted from the nutrient contribution of the starter fertilizer. See Section 4.6 for provisions regarding the application rates of compost with and without soil incorporation. See Section 14.3 thru Section 14.5 for information about selected fertilizer materials.

4.2c Micronutrient Fertilizers

Micronutrient fertilizers are fertilizers which contain guaranteed quantities of plant essential micronutrients such as iron, boron, zinc, copper, manganese, or other elements required for the growth of turfgrass, but which do not contain significant quantities of nitrogen, phosphorus, or potassium. Micronutrient fertilizers shall be uniform in composition, free flowing, and suitable for application with mechanized rotary spreaders, drop spreaders, hydraulic seeders, or other equipment capable of uniformly distributing fertilizer over the soil surface, or shall be formulated for use with sprayer equipment. Such fertilizers shall be specifically designated as appropriate for use in turfgrass, and shall be labeled according to Maryland fertilizer laws. Mirconutrient fertilizers shall include the trade name of the product, the identity of the chemical ingredients of the product, and the guaranteed nutrient analysis of the product. The addition of iron, boron, zinc, copper, manganese, or other micronutrients shall be in accordance with soil test results and the recommendations of the University of Maryland Soil Testing Laboratory, or another accredited soil testing laboratory, or the Maryland Cooperative Extension Service. Micronutrient fertilizers shall not be applied to soils which will be seeded to turfgrass in the absence of soil tests, and shall not be included in routinely applied starter fertilizers (see Section 4.2b).

4.3 Limestone

4.3a Limestone Composition and Physical Properties

Limestone may be used to increase soil pH by decreasing soil acidity, or may be used to supply calcium and sometimes magnesium, an essential plant nutrient. Limestone used for turfgrass soil pH modification and as a nutrient source of calcium shall be composed of finely ground calcitic or dolomitic limestone (calcium carbonate or calcium carbonate + magnesium carbonate), and shall contain a minimum of 50% total oxide equivalent (calcium oxide + magnesium oxide); neither hydrated or burnt lime shall be used for turfgrass seeding. Limestone shall be uniform in composition, free flowing, and suitable for application with mechanized rotary spreaders, drop spreaders, hydraulic seeders, or other equipment capable of uniformly distributing limestone over the soil surface.

4.3b Limestone Grades and Labeling

Limestone shall conform to one of the following grades: pulverized (fine powder), granulated (coarse powder), or pelletized (small, rounded aggregates of fine powder). Limestone shall be labeled according to Maryland law, and shall include the trade name of the product, the identity of the chemical ingredients of the product, and the guaranteed analysis of the product. Bagged limestone shall carry the required label information on its bags. Label information pertaining to bulk limestone shall accompany and be delivered to the seeding site by the distributor at the time of delivery.

4.3c Pulverized Limestone

Pulverized limestone, the most finely ground limestone material, shall be of such fineness that a minimum of 50% of the ground limestone shall be able to pass through a 100 mesh sieve, and a minimum of 98% shall be able to pass through a 20 mesh sieve. Pulverized limestone applications over 50 pounds per 1000 ft2 shall be uniformly incorporated into the upper 4.0 to 6.0 inches of the soil surface; pulverized limestone applications of 50 pounds per 1000 ft2 or less may be incorporated or left on the soil surface. Pulverized limestone shall be distributed with drop spreaders at times when high winds will not interfere with uniform distribution or cause nuisance dust. Pulverized limestone shall not be distributed with rotary spreaders or other spreaders. Pulverized limestone may be included in the hydraulic seeding slurry.

4.3d Granular Limestone

Granular limestone, a medium grade of ground limestone material, shall be of such fineness that a minimum of 30% of the ground limestone shall be able to pass through a 100 mesh sieve, a minimum of 50% shall pass through a 60 mesh sieve, and a minimum of 98% shall be able to pass through a 20 mesh screen. Limestone applications over 50 pounds per 1000 ft2 shall be uniformly incorporated into the upper 4.0 to 6.0 inches of the soil surface; granulated limestone applications of 50 pounds per 1000 ft2 or less may be incorporated or left on the soil surface.. Granular limestone may be distributed with drop or rotary spreaders, but shall not be included in the hydraulic seeding slurry.

4.3e Pelletized Limestone

Pelletized limestone, a product composed of pellets made of pulverized limestone, shall be of a pellet type and size which is recommended by the manufacturer for use with turfgrass. The limestone used in the manufacture of a pelletized limestone product shall be of such fineness that a minimum of 50% of the ground limestone shall be able to pass through a 100 mesh sieve, and a minimum of 98% shall be able to pass through a 20 mesh sieve. Pelletized limestone applications over 50 pounds per 1000 ft2 shall be uniformly incorporated into the upper 4.0 to 6.0 inches of the soil surface; pelletized limestone applications of 50 pounds per 1000 ft2 or less may be incorporated or left on the soil surface. Pelletized limestone may be distributed with rotary or drop spreaders, or in hydraulic seeding slurries.

4.3f Limestone Application Rates to Raise Soil pH

Limestone application rates to raise soil pH shall be based upon soil tests and standardized recommendations. Soil pH shall be determined by the University of Maryland Soil Testing Laboratory, or another accredited soil testing laboratory. Limestone applications shall be based on the recommendations of the soil testing laboratory, or the Maryland Cooperative Extension Service, or Table A, below. Where applications of limestone are required, the limestone shall be uniformly distributed over the soil surface with appropriate spreader equipment.

 

Table A
Pounds of Limestone to Add per 1000 ft2
To Raise Soil pH to 6.5

Soil Texture Class

Original pH  Sand  Loam Clay
4.8 85 140 200
5.0 75  125 175
5.2 65 110 150
5.4 55 95 125
5.6 45 80 100
5.8 35 65 80
6.0 25 50 60
6.2 15 35 40
6.4 5 15 20

4.4 Elemental Sulfur

4.4a Use and Composition of Elemental Sulfur to Reduce Soil pH

.1. General. Elemental sulfur (S) may be used to reduce soil pH by increasing soil acidity. Elemental sulfur shall be composed of coarsely ground or granular sulfur (S) with minimum purity of 95%. Elemental sulfur shall be the only material used for reducing soil pH; neither aluminum sulfate, nor iron sulfate, nor any other chemical may be used to reduce soil pH at sites intended for turfgrass seeding.

.2. Limitations. Although sulfur is an essential plant nutrient, elemental sulfur (S) shall not be used as a fertilizer material. When soil tests show that sulfur is deficient in the soil of a turfgrass seeding site, then either gypsum, ammonium sulfate, sulfur coated urea, or potassium sulfate shall be used to correct the sulfur deficiency. The use of sulfur fertilizer is discussed in section 4.2a and 4.2b. Information about the nutrient content of fertilizer materials is included in Section 14.3 thru Section 14.5.

4.4b Application of Elemental Sulfur

Elemental sulfur application rates shall be based upon soil tests and standardized recommendations. Soil pH shall be determined by the University of Maryland Soil Testing Laboratory, or another accredited soil testing laboratory. The use of elemental sulfur to reduce soil pH shall be based on the recommendations of the soil testing laboratory, or the Maryland Cooperative Extension Service, or Table B, below. Where applications of elemental sulfur are recommended, the elemental sulfur shall be uniformly spread and incorporated into the upper 4.0 to 6.0 inches of the soil surface. Elemental sulfur shall not be broadcast and left on the soil surface, or included in hydraulic seeding mixtures.

 

Table B
Pounds of Elemental Sulfur to Add per 1000 ft2
To Reduce Soil pH to 6.5

Soil Texture

Original pH Sandy Soil  Clay Soil
7.5 10-15 20-25
8.0 25-35 35-50
8.5 35-50 40-50


4.4c Notes About Elemental Sulfur

Elemental sulfur is flammable, and the combination of elemental sulfur and fertilizers can be explosive. Elemental sulfur is slowly decomposed (oxidized) in the soil, particularly in cold weather. Depending upon the season of application, complete decomposition of elemental sulfur may require many months. During decomposition, the sulfur granules are changed into sulfuric acid, and the soil near the granules becomes very acidic, which may kill turfgrass seedlings, mature plants, earthworms, and soil microflora.

4.5 Gypsum

4.5a Gypsum Composition

Gypsum may be used as a fertilizer to supply calcium and/or sulfur for turfgrass seeding, or as an aid to reduce excessive soluble salts in soil, or to improve soil physical properties. Gypsum shall be composed of finely ground gypsum (calcium sulfate, CaSO4) with a minimum purity of 90%. Gypsum shall be uniform in composition, free flowing, and suitable for application with mechanized rotary spreaders, drop spreaders, or other equipment capable of uniformly distributing gypsum over the soil surface.

4.5b Gypsum Grades and Labeling

Gypsum shall conform to one of the following grades: pulverized (fine powder), granulated (coarse powder), or pelletized (small, rounded aggregates of fine powder). Gypsum shall be labeled according to Maryland law, and shall include the trade name of the product, the identity of the chemical ingredients of the product, and the guaranteed analysis of the product. Bagged gypsum shall carry the required label information on its bags; label information pertaining to bulk gypsum shall accompany and be delivered to the seeding site by the distributor at the time of delivery.

4.5c Use of Gypsum to Remove Soluble Salts

.1. How gypsum works. Gypsum is used as an aid to hasten the removal of soluble salts (e.g., sodium) from soils. It is important to keep in mind that while the addition of gypsum makes it easier for soluble salts to be leached by water moving through the soil, only leaching can remove soluble salts from soil. The leaching process can be very slow, and may require several years.

.2. Application. Where additions of gypsum are required to assist with the removal of soil soluble salts, gypsum shall be incorporated into the upper 4.0 to 6.0 inches of the soil surface. Gypsum used to reduce soil soluble salts shall not be left on the soil surface, and shall not be included in hydraulic seeding mixtures with seed. Gypsum application rates shall be based upon soil tests and standardized recommendations. Modifications to reduce excess soil soluble salts by incorporating gypsum into the soil shall be made according to the recommendations of the University of Maryland Soil Testing Laboratory, or another accredited soil testing laboratory, or the Maryland Cooperative Extension Service, or Table A, below. Gypsum shall be uniformly distributed over the soil surface with appropriate spreader equipment calibrated for use with gypsum.

 

Table C
Pounds of Gypsum to Add per 1000 ft2
To Reduce Soluble Salts to Recommended Levels

Original Salts Level

 Pounds Gypsum

millisiemens  parts per million (ppm)  per 1000 ft2
8 2500 320
7 1800 230
6 1250 160
5 700 80
4.5

550

40

 

4.5d Use of Gypsum as Fertilizer

Where additions of gypsum are recommended to correct soil deficiencies of calcium or sulfur, based on soil tests conducted by the University of Maryland Soil Testing Laboratory, or another accredited soil test lab, or the Maryland Cooperative Extension Service, the recommended amount of gypsum may be applied to the soil surface without soil incorporation, and may be included in hydraulic seeding mixtures. Gypsum shall be uniformly spread over the soil surface with properly calibrated equipment. Pelletized gypsum and granulated gypsum shall be spread with rotary or drop spreaders. Pulverized gypsum shall be spread only with drop spreaders. Hydraulic seeders shall use pelletized or pulverized gypsum. Not more than 50 pounds per 1000 ft2 of pelletized, pulverized, or granulated gypsum shall be applied in a single application to the soil surface of areas which will be seeded to turfgrass.

4.6 Compost

4.6a Derivation and Definition of Compost

Compost shall be derived from any combination of the following fully decomposed materials: grass clippings, leaves, wood chips, animal byproducts or residuals, sewage sludge, or other organic materials or adjuvants which are commonly utilized in the production of compost. Compost shall be fully matured, and shall be cured for a minimum of 30 days; minimal biological activity, as evidenced by noticeable heat or odor, shall be present at the time of delivery to the seeding site or at the time of soil application. Compost shall be dark brown to black in color and shall be capable of supporting the germination and development of turfgrass seedlings.

4.6b Compost Impurities

Compost shall be free of plant pathogens, human pathogens, and weed seeds; proof of conformity to EPA minimum heating requirements (i.e., compost developed a minimum temperature of 55o C or 131o F for 5 days during production) shall be sufficient to establish the compost as free of pathogens and weed seeds. Compost shall not contain concentrations of any heavy metal or other material which exceed EPA 503. Compost shall contain a minimum of 50% organic matter by weight, and shall not contain more than 1.0% by weight of pebbles or small stones which are greater than 0.25 inches in diameter. Compost shall not contain noticeable quantities of wood, metal, bone, plastic, rubber or similar refuse. Compost shall not contain any solid objects, including stones and wood chips, larger than 1.0 inches in diameter.

4.6c Compost Physical Condition, Water Content, pH and Soluble Salts

Compost shall be loose and friable, with a water content less than or equal to 30% by weight, and shall be of such fineness that 98% is able to pass a 1.0 inch screen. The pH of compost shall not be less than pH 5.5 nor greater than pH 8.0. The soluble salts concentration of compost shall be less than 5.0 millisiemens.

4.6d Compost Testing

Compost shall be tested by the compost producer, who shall guarantee that the compost meets the specifications of Section 4.6a-c. Such guarantee shall serve to establish the suitability of the compost for turfgrass seeding.

4.6e Soil Testing Before Use of Compost

Applications of compost shall be based on soil nutrient and organic matter requirements as demonstrated or recommended by soil tests performed by the University of Maryland Soil Testing Laboratory, or another accredited soil testing laboratory, or the Maryland Cooperative Extension Service. In the absence of such tests, and regardless of any demonstrated soil nutrient deficiencies, compost may be used as a starter fertilizer and soil amendment for routine turfgrass establishment when applied to the soil surface according to the provisions of Section 4.6f, or when applied and incorporated into the upper 4.0 to 6.0 inches of the soil surface according to the provisions of Section 4.6g.

4.6f Compost as Starter Fertilizer

.1. Compost nutrients subtracted from starter fertilizer. When compost is used alone or in combination with other fertilizer materials to comprise a starter fertilizer for turfgrass seeding, as specified in Section 4.2b, the nutrient contribution of the compost shall be subtracted from the nutrient contribution of the starter fertilizer used, if any. Compost may be used to replace some or all of the nutrients which might otherwise be applied as a starter fertilizer.

.2. Surface applied compost rates. In the absence of soil tests to establish a greater need for nitrogen, phosphorus, potassium, and sulfur, the maximum allowable contribution of these nutrients by compost used as a starter fertilizer shall be the same as the maximum allowable nutrient contribution of an ordinary inorganic starter fertilizer (see Section 4.6g) i.e., 1.0 pound nitrogen (N), and 2.0 pounds phosphorus (P205), and 2.0 pounds potassium (K2O), and 0.5 pound sulfur (S) when the compost is spread and left on the soil surface.

.3. Soil incorporated compost rates. In the absence of soil tests to establish a greater need for nitrogen, phosphorus, potassium, and sulfur, the maximum allowable contribution of these nutrients by compost used as a starter fertilizer shall be twice the same as the maximum allowable nutrient contribution of an ordinary inorganic starter fertilizer or of surface applied compost (see above) when compost is incorporated into the upper 4.0 to 6.0 inches of the soil. When compost is incorporated as a starter fertilizer, 2.0 pounds nitrogen (N), and 4.0 pounds phosphorus (P205), and 4.0 pounds potassium (K2O), and 1.0 pound sulfur (S) may be applied.

4.6g Methods and Timing of Compost Application

Compost shall be uniformly spread with suitably calibrated equipment over the soil surface, or uniformly spread and incorporated into the upper 4.0 to 6.0 inches of the soil surface by rototilling, disking, or other approved method. Compost applications shall be timed so that seeding will be completed within 15 days after the application of compost, or at the time of seeding, or up to 5 days after seeding operations are completed. Compost shall not be applied to newly seeded turfgrass at any time later than 5 days after seeding, or until the turfgrass seeding is fully established.

4.6h Surface Application of Compost

When compost is applied and left on the soil surface without subsequent soil incorporation, not more than 0.5 inches of compost shall be applied and left on the soil surface. Also, any compost which is to be spread on the soil surface and left without subsequent soil incorporation shall not deliver more than 2.0 pounds of actual nitrogen (N) per 1000 ft2 and/or 4.0 pounds of phosphorus (P205) per 1000 ft2. Compost applications which exceed 0.5 inches in depth, or which exceed 2.0 pounds of nitrogen and/or exceed 4.0 pounds of phosphorus shall be incorporated into the upper 4.0 to 6.0 inches of the soil surface within 2 days after application, or before the first significant rainfall, as specified in Section 4.6i, below. Compost shall not be left on the soil surface in any site where rain or runoff may dislodge and erode it into nearby streams or water systems; the routine application of straw or other soil mulch designed to protect the soil and compost from erosion is recommended at all sites where up to 0.5 inches of compost is spread and left on the soil surface (See Section 7, Seed Mulches).

4.6i Soil Incorporation of Compost

When compost applications exceed 0.5 inches of compost spread on the soil surface, or when the nutrient application to the soil as delivered by compost exceeds 2.0 pounds of nitrogen (N) per 1000 ft2 and/or 4.0 pounds of phosphorus (P205) per 1000 ft2 the compost must be incorporated into the upper 4.0 to 6.0 inches of the soil surface within 2 days after the application of the compost, or before the first significant rainfall. Compost applications shall not cause soil organic matter concentrations to exceed 25% by volume when sampled over the top 4.0 inches of the soil surface. Sites which receive heavy compost applications in accordance with Section 4.6 shall be protected from erosion by rain or water runoff; straw or other soil mulch designed to protect the soil and compost from erosion. Erosion control mulches shall be applied within 2 days after the soil incorporation of compost, or before the first significant rain (see Section 7, Seed Mulches).

4.6j Non-Standard Compost

Compost which does not meet the specifications of Section 4.6a-b shall be considered non-standard compost. Non-standard compost may be used for turfgrass seeding when all parties which may be affected its use are informed by the seeding contractor and/or supplier of the compost of the possible consequences of such use. All parties must give approval of the use of non-standard compost before it is delivered to the seeding site. Unless other specifications are approved by all parties, the application methods and application rates used for non-standard compost shall conform to Section 4.6e-i..

4.7 Site Protection and Damage Repair

4.7a Site Protection

It shall be the responsibility of the seeding contractor to install signs, flagging, etc. at the perimeter of all areas which receive fertilizer, compost, limestone, elemental sulfur, or gypsum applications immediately after the completion of spreading operations, which shall serve to notify foot and vehicular traffic that a sensitive area may be damaged by their entry. The seeding contractor shall not be financially or otherwise held liable to repair a fertilizer/soil amendment spreading site that is damaged by the entrance of such traffic when the site has been appropriately designated with signs, flagging, etc. at its perimeter (see Disclaimer, Section 4.10).

4.7b Erosion Protection and Damage Repair

.1. General. It shall be the responsibility of the seeding contractor to ensure that fertilizer, compost, and other materials applied according to the specifications of Section 4 are not blown, washed, or otherwise removed from the fertilizer/soil amendment spreading site, and so that nearby streams and other areas shall be protected from soil, fertilizer, compost, etc.

.2. Repairs to fertilizer/soil amendment spreading sites. In the event of heavy rain, wind, or other natural event that causes damage to the fertilizer/soil amendment spreading site before seedbed preparation and seeding operations are begun, which is of a kind or type that may have been anticipated or prevented by the seeding contractor, then the seeding contractor shall be obliged to make repairs limited to the damaged areas within the fertilizer/soil amendment spreading site, so that the site is restored to a condition acceptable according to the specifications of Section 4, and which may be readily prepared for seeding according to the specifications of Section 3, or as may be otherwise specified.

.3. Repairs to nearby areas. In the event of heavy rain, etc. that causes damage to the fertilizer/soil amendment spreading site, as described in Section 4.7b.2., above, and which also causes damage to nearby areas, as may be evidenced by fertilizer deposition, soil deposition, etc. on the surfaces of the nearby areas, then the seeding contractor shall be obliged to make repairs to the damaged nearby areas, so that the nearby areas shall be restored to a condition substantially similar to their condition before the damaging event.

.4. Special limitations. The seeding contractor shall not be obliged, financially or otherwise, to regrade, replace lost topsoil, refertilize, or make any other repairs to the fertilizer/soil amendment spreading site, or to any nearby areas, when there is evidence that the damage caused to the site was substantially due to water, soil, or other materials which passed into the fertilizer/soil amendment spreading site from an area which was not stabilized or under the control or supervision of the seeding contractor. Examples of situations which shall void the responsibility of the seeding contractor to repair the fertilizer/soil amendment spreading site and nearby areas shall include the failure of responsible parties to provide effective groundcover, spillways, drainage diversions, water settlements, silt fence, etc. for areas which drain into the site, which would have prevented significant damage to the fertilizer/soil amendment spreading site and nearby areas.

4.8 Clean Up

Soil, fertilizer, compost, limestone, elemental sulfur, and gypsum, shall be removed from paved areas as soon as possible after spreading operations and soil incorporation operations are completed. Clean up operations shall be completed before acceptance is given.

4.9 Acceptance

4.9a Acceptance of Materials

The seeding contractor shall inform all affected parties of the composition of the fertilizer, compost, limestone, elemental sulfur, and gypsum materials which are intended for application at the fertilizer/soil amendment spreading site before any of these materials are applied at the site; acknowledgment of acceptance of these materials shall be given by the owner, general contractor, landscape architect, or other person(s) authorized to make such a decision before spreading operations are begun. Labels and other material identification pertaining to the materials which are applied shall be retained by the seeding contractor for a minimum of 90 days after the completion of spreading operations.

4.9b Acceptance of Performance

Acknowledgment of acceptable performance shall be given by the owner, general contractor, landscape architect, or other person(s) authorized to inspect the fertilizer/soil amendment spreading site upon the satisfactory completion of each Subsection of Section 4. The fertilizer/soil amendment spreading site shall be inspected within 24 hours of the completion of each Subsection, or upon the completion of spreading operations, as indicated by the seeding contractor, unless specified otherwise. The seeding contractor shall give notification when all Subsections of Section 4 have been completed; final acceptance and payment shall be made within 24 hours of such notification, or within the time period specified in the contract.

4.10 Disclaimer

4.10a Damage

The seeding contractor shall not be financially or otherwise held liable to repair damages incurred to the fertilizer/soil amendment spreading site as a result of materials not applied under the supervision of the seeding contractor, nor by vandalism, nor by acts of God. The seeding contractor shall not be financially or otherwise held liable to repair or otherwise amend the fertilizer/soil amendment spreading site as a result of the use of fertilizer, compost, limestone, elemental sulfur, or gypsum which are labeled in error or which are otherwise not in accordance with the label or description provided with them by the manufacturer or distributor of the products, when they are applied by the seeding contractor in good faith, in accordance with their label or description.

4.10b Hazards

It shall be recognized that the fertilizer/soil amendment spreading site is a construction zone not under the ownership or legal control of the seeding contractor, and as such may present hazards to persons or property which enter the site. The seeding contractor specifically disclaims any and all responsibility for the safety and security of persons or property which may enter the fertilizer/soil amendment spreading site before the seeding contractor has begun work or when work is underway or at any time after work has been completed, and without regard to whether such entry is legal or otherwise. The seeding contractor shall assume no responsibility for personal injury or property damage, nor be subject to any claims of negligence, when the seeding contractor has performed work according to the specifications of MSA-GS-99, as mutually agreed, or has applied products or materials according to the recommendations of their manufacturer or distributor.

4.11 Guarantee

4.11a General Guarantee

The seeding contractor shall guarantee that all fertilizer, compost, limestone, elemental sulfur, and gypsum which are selected for use at the fertilizer/soil amendment spreading site, as well as the methods which are used to apply and incorporate these materials, shall be selected and applied under the supervision of the seeding contractor, and shall be appropriate for the site and the intended use of the site, according to the specifications of Section 4, unless specified otherwise.

4.11b Special Guarantees

.1. Erosion. The seeding contractor shall guarantee that all reasonable methods to control the loss of compost, fertilizer, limestone, elemental sulfur, and gypsum which are applied at the fertilizer/soil amendment spreading site according to the specifications of Section 4, shall be installed at the site when spreading and/or soil incorporation operations are completed.

.2. Starter fertilizer. The seeding contractor shall guarantee that fertilizer and/or compost application rates shall be made according to the specifications of Section 4.2b and/or Section 4.6f when fertilizer and/or compost is used as a starter fertilizer in the absence of soil tests to establish a greater need for plant nutrient applications.

.3. Application methods. The seeding contractor shall guarantee that applications of fertilizer, compost, limestone, elemental sulfur, and gypsum shall be distributed and incorporated into the soil as may be required according to the specifications of Section 4 in a timely manner in order to minimize their loss of and potential for environmental damage, and to maximize their agronomic effectiveness.

4.12 Payment

The seeding contractor shall give notification upon the completion of Section 4; the fertilizer/soil amendment spreading site shall be inspected within 24 hours of such notification, and payment shall be made at that time, or as specified in the contract. When payment is not received within the specified time period, the seeding contractor may void any guarantees related to Section 4, and may seek appropriate legal remedies.