PRACTICE AND TILL (Ac.) Code 346 DEFINITION After planting, residues shall be maintained in the furrows until the ridges are rebuilt by Managing the amount, orientation, and cultivation. Ridges shall be rebuilt to their distribution of crop and plant residues on design height and shape during the last row the soil surface year-round, while growing cultivation. crops on pre-formed ridges alternated with furrows protected by crop residue. Stable Outlets. A stable outlet must exist where ridges direct runoff to areas of concentrated flow. PURPOSE Maximum Row Grade. Row grades shall not Reduce sheet and rill erosion. exceed those given in the following table. Reduce wind erosion and Particulate matter less than 10 micrometers in diameter - PM 10-Year Storm Maximum Row 10. Erosivity Index (EI) Grade (%)1 Maintain or improve soil quality. <100 9 Reduce energy use. 100 150 7 – Manage snow to increase plant-available >150 6 moisture. 1 Based on existing water erosion prediction technology Modify cool wet site conditions. (climate database). Provide food and escape cover for wildlife. Use the row grade limitation for next higher year storm EI value: CONDITIONS WHERE APPLIES If sprinkler irrigation is used with this This practice applies to all cropland practice or This practice includes tillage and planting Where residue cover is less than 30 methods commonly referred to as till or percent, use the maximum row grade for ridge planting. It does not include no-till the next higher 10-year storm EI value. planting on ridges, or bedding or listing Additional Criteria to Reduce Sheet and Rill operations that bury crop residues. Erosion CRITERIA Soil and residue removed from the top of the ridge shall be moved into the furrow between General Criteria Applicable to All Purposes the ridges. Following crop harvest, residues shall remain planting, the top of the ridge shall be on the surface until planting with no additional maintained at least 3 inches higher than the disturbance except for normal weathering. furrow between the ridges. Ridge height shall be maintained throughout The top shall be shaped to direct runoff to the harvest and winter seasons by controlling the protected furrow area. equipment and livestock traffic.
TILL (Ac.) Code 346 DEFINITION Managing the amount, orientation, and distribution of crop and plant residues on the soil surface year-round, while growing crops on pre-formed ridges alternated with furrows protected by crop residue. PURPOSE Reduce sheet and rill erosion. Reduce wind erosion and Particulate matter less than 10 micrometers in diameter - PM 10. Maintain or improve soil quality. Reduce energy use. Manage snow to increase plant-available moisture. Modify cool wet site conditions. Provide food and escape cover for wildlife. CONDITIONS WHERE PRACTICE APPLIES This practice applies to all cropland This practice includes tillage and planting methods commonly referred to as till or ridge planting. It does not include no-till planting on ridges, or bedding or listing operations that bury crop residues. CRITERIA General Criteria Applicable to All Purposes Following crop harvest, residues shall remain on the surface until planting with no additional disturbance except for normal weathering. Ridge height shall be maintained throughout the harvest and winter seasons by controlling equipment and livestock traffic. After planting, residues shall be maintained in the furrows until the ridges are rebuilt by cultivation. Ridges shall be rebuilt to their design height and shape during the last row cultivation. Stable Outlets. A stable outlet must exist where ridges direct runoff to areas of concentrated flow. Maximum Row Grade. Row grades shall not exceed those given in the following table. 10-Year Storm Erosivity Index (EI) Maximum Row Grade (%)1 <100 9 100 – 150 7 >150 6 1 Based on existing water erosion prediction technology (climate database). Use the row grade limitation for next higher storm EI value: If sprinkler irrigation is used with this practice or Where residue cover is less than 30 percent, use the maximum row grade for the next higher 10-year storm EI value. Additional Criteria to Reduce Sheet and Rill Erosion Soil and residue removed from the top of the ridge shall be moved into the furrow between the ridges. planting, the top of the ridge shall be maintained at least 3 inches higher than the furrow between the ridges. The top shall be shaped to direct runoff to the protected furrow area. year AND
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