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484- 1 NATURAL RESOURCES CONSERVATION SERVICE CONSERVATION PRACTICE STANDARD MULCHING (Ac.) CODE 484 DEFINITION The mulch material shall be evenly applied and anchored to the soil. Tackifiers, emulsions, Applying plant residues, by-products or other pinning, netting, crimping or other acceptable suitable materials produced off site, to the land methods of anchoring will be used if needed to surface. hold the mulch in place for specified periods. PURPOSE Manufactured mulches shall be applied Conserve soil moisture according to the manufacturer's specifications. • Mulching operations shall comply with federal, • Moderate soil temperature state and/or local laws and regulations during the • Provide erosion control installation, operation and maintenance of this • Suppress weed growth practice. Establish vegetative cover Mulch material shall be relatively free of disease, • noxious weed seeds, and other pests and • Improve soil condition and increase soil pathogens. fertility Additional Criteria To Conserve Soil Moisture CONDITIONS WHERE PRACTICE APPLIES Mulch materials applied to the soil surface shall This practice applies to all lands where mulches provide at least 60 percent cover to reduce are needed. This practice may be used alone or potential evaporation. in combination with other practices. Mulch material shall be applied prior to moisture CRITERIA loss. Prior to mulching, ensure soil under shallow rooted crops is moist, as these crops General Criteria Applicable To All Purposes require a constant supply of moisture. The selection of mulching materials will depend Additional Criteria To Moderate Soil primarily on site conditions and the material's Temperature availability. Mulch materials shall consist of Mulch materials shall be selected and applied to natural and/or artificial materials such as plant obtain 100 percent coverage over the area residue, wood bark or chips, by-products, gravel, treated. The material shall be of a significant plastic, fabric, animal manure, rice hulls, and thickness to persist for the period required for materials from food processing plants or other equivalent materials of sufficient dimension the temperature modification. (depth or thickness) and durability to achieve the Additional Criteria To Provide Erosion intended purpose for the required time period. Control Mulching is generally performed after grading, When mulching with cereal grain straw or grass soil surface preparation and seeding and hay, apply in sufficient amounts to provide 70 plantings are complete. Soil surface shall be prepared in order to achieve the desired percent ground cover. Mulch rate shall be purpose. Conservation practice standards are reviewed periodically,and updated if needed. To obtain NRCS, NHCP the current version of this standard,contact the Natural Resources Conservation Service. July 2002