The needed distance will ...
Published by Torsten Mandal, Freelance consultant, M.Sc.+, Agronomist, agroforestry, tropical crops, soil and water
The needed distance will largely depend on the vegetation ability to infiltrate and take up water and nutrients. I developed improved, low-cost establishment methods for tree-legumes I think can help. They also help to rapid terrace formation. Some of the methods can be used for direct seeding grass too. The 100-300 m mention are probably for the huge amounts of nitrate etc. from US feedlots. It is only a brief preliminary reply on complex issues. I can suggest alternatives too.