If the compost product is reused,it can accomplish a number of additional purpose including to save as a source of organic matter for maintaining or building supplied of soil humus, necessary for proper soil structure and moisture-holding capacity, to improve growth ad vigor of crops in commercial agriculture or home related uses, and to reclaim and reuse certain valuable nutrients including nitrogen, P,K and wide variety of essential trace elements.
The nutrients content of compost is related to the quality of original organic substrate
However, most composts are too low in nutrients to be classified as fertilizers.
Their main use is as a soil conditioner, much of top dressing or as an organic base with fertilizer amendments.
On the other hand, nutrients such as nitrogen are organically bound and slowly released throughout the growing season, making them less susceptible to loss by compared to soluble fertilizers.