454Nombre de vues
9Évaluation

ORGANIC vegetable growers often use nitrogen from CONVENTIONAL animal manure & slaughter by-products. These 'repackaged' synthetic N fertilizers cause SUSTAINABILITY problems in organic SOIL FERTILITY management. IMPORTANT QUESTIONS: Should organic farmers be ALLOWED TO USE PURE synthetic nitrogen fertilizers rather than just repacked synthetic N? Can't LEGUMES produce the agricultural nitrogen needs for our current world population? Can nitrogen fertilizers be produced with RENEWABLE ENERGY? Are synthetic nitrogen fertilizers toxic? What's 'SPORGANIC agriculture' ? This video by USDA-ARS scientist Dr. Eric Brennan was first presented at a symposium 'SUSTAINABILITY CHALLENGES IN ORGANIC AGRICULTURE" at the the American Society of Agronomy annual meeting in Phoenix, Arizona in November, 2016. https://scisoc.confex.com/scisoc/2016am/webprogram/Session15901.html