Farmers may choose to apply either chemical or organic fertilizers to meet crop requirements though decomposing crop residues from green manure cover crops (GMCEs), other cover crops and previous crops also supply essential nutrients. One important distinction between CA and other agricultural systems is that crop residues are left on the soil surface and are not incorporated into the soil. Chemical and organic fertilizers, however, should be banded into the soil with minimal soil disturbance using the appropriate planting equipment/ implement. The result of improved biological activity in CA soils means more nutrients recycling and a better nutrient supplying capacity of the soil. However, for high yield some additional external nutrients may need to be applied. It may be difficult to band bulky organic fertilizers and these can be placed as mulch on the soil surface where microbes utilize and break them down in forms available to plant roots.

I found your question as not clear !!. Regards.

To meet crop requirements, farmers can use chemical or organic fertilizers, though decomposing crop residues from green manure cover crops, other cover crops, and previous crops can also provide critical nutrients.

http://conservationagriculture.mannlib.cornell.edu/pages/aboutca/faq.html#2