List three alternatives to the use of chemicals on the world's croplands.?

Question

List three alternatives to the use of chemicals on the world's croplands.?

Answer 1

I'm assuming were not talking Conagra.

1.  Animal Manure

2. Winter Rye plowed under in Spring

3  Crop residue after harvest, plowed under as organic matter.

Answer 2

healthy soil,   indigenous crops,  crop rotation

Answer 3

Are you farming three acres or three thousand?  What type of crops are we talking about here?   Where farmers cover thousands of acres it will be difficult to not use some chemicals.   Genetically modified crops are reducing the use of pesticides.