Question

if a farmer wants to improve water holding capacity of his sandy soil field what will you suggest to him

Answer 1

What you need to do is increase the capacity of your soil to hold nutrients. Then adding fertilizers (either organic or not) will be much more effective, because the stuff you put in your soil will actually stay there. As I mentioned before, compost or mulch are sometimes not the best option because they’re often decomposed very quickly. But there is a way to permanently improve the organic matter content of your soil. It’s called biochar.