Is this reason is sufficient ? It is low in nutrient value, but on both conventional or organic farms, it brings in a good source of micronutrients, building soil biological activity and increase cation exchange capacity .
https://www.mofga.org/Publications/The-Maine-Organic-Farmer-Gardener/Winter-2005-2006/Composting
If the input comes from the farm itself the process is returning nutrients. If the source is off-farm it's adding them.
Dear Hem C. Joshi according to the link shown below, "compost provides many benefits as a soil amendment and a source of organic matter by improving soil biological, chemical, and physical characteristics".
https://eorganic.org/node/2880
In a small acreage organic farms, the use of compost help to reduce the need of chemical fertilizers, retain moisture, add micronutrients and increase microbes activity.
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