Crop residues are the left overs in the field after grains have been harvested. In the past, they were considered as waste but researches have shown that they have very high value in nutrient, erosion control, infiltration, carbon sequestration and many more. Crop residue should be left in the field instead of harvesting.
Crop residues are important source of nutrient for maintaining soil productivity. Crop residues differ in terms of nutrient content in them. It was found that leaves and husks contain more nutrient than stalk. To maintain soil organic matter at its best, it is estimated that 2 to 3 ton/acre of crop residue should be left in the field annually through conservation tillage or no till system.