If you are applying both wheat husk and pine needles to soil, can we collectively refer to them as "crop residues"? If not, what would be a more appropriate term?
Wheat husk applied to soil is crop residue especially when they are left in place. The accumulation of pine needles would be viewed as plant residues not of a crop plant. Residues of plants and crops can be useful for weed control and maintaining soil water retention while maintaining soil structure.
Technically, pine needles applied to soil cannot be considered "crop residues" as they are not a byproduct of crop production. Crop residues are the plant materials left in a field after a crop has been harvested, such as stalks, leaves, and roots.
However, pine needles can be considered a type of organic matter or mulch that is added to soil to improve its properties. When pine needles decompose, they release nutrients and organic matter into the soil, which can improve soil fertility, water retention, and structure. Pine needles can also help to suppress weed growth and reduce soil erosion.
So while pine needles cannot be considered crop residues, they can still be a useful material for improving soil health and crop production.
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