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THE BASICS OF SOIL ORGANIC MATTER PHYSICAL PROPERTIES AND NUTRIENTS
What is Soil Organic Matter?
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acid acre aeration Agriculture alfalfa amount animal applied bacteria calcium carbon cation cause clay compacted soil compost corn cover crops crop residues crop rotation crusting cycle dairy manure decompose decomposition decrease earthworms effects erosion farm farmers feed fertilizer field figure forage fungi ganic matter grain grass green manure growing growth hairy vetch harvest humus improve soil increase infiltration insects labs leaching legume lignin lime losses magnesium maintain materials microorganisms minerals mulch needed nitrate nitrogen and phosphorus no-till occurs organic mat organic matter levels organic residues percent phosphorus pile plants plow layer pores potassium practices problems production PSNT rainfall recommendations reduced tillage regions roots rotation runoff seed soil compaction soil health soil organic matter soil pH soil structure soil surface soil test soil's sources soybeans subsoil tillage tillage systems tilth tion topsoil types usually vegetable weed yields