The first question to ask you before any answer can be given is- what is the objective of your soil amendment? Is it to improve agronomic values of crops or what? this will help in answering your question.
If your aim is soil and water conservation by reducing of the soil erosion and runoff, I think that you need apply whatever amendment that adds organic matter into the soil. Nevertheless, you need to incorporate other measures related to organic agriculture as zero tillage, cover crops, among others.