Before I began studying permaculture, I worked on a watershed management plan in Southern Califoria for a water body that receives a great deal of agricultural runoff. The agricultural “experts” told us, “As long as there a winter row crops” (winter being the rainy season), “there will be nitrogen runoff”, resulting in excess nitrogen in the river. And I believed them! Now I’m learning that doesn’t have to be the case. There are other ways to manage row crops that could considerably reduce “excess nitrogen” in stormwater runoff from the fields. Thank you for sharing your experience and knowledge with us.-Sunny