agriculturalpollution agriculture agriculturedurable animalindustry biochemical botany charbondebois charcoal chemical congresses corn cornasfood cornindustry cornproductsindustry crops delmarvapeninsula ecology economicaspects effectofchemicalson effectofnitrateson effectofwaterpollutionon engineering engraisetamendements environmentalaspects environmentalconservation environmentalcontrol environmentalhealth environmentalmanagement environnement farms fertilité fertilizer fixation fluid foodadditives general geneticallymodifiedfoods gestion greenhousegases groundwater health herbicides iowa lifesciences livestock management metabolism methane nature nitrates nitrifyingbacteria nitrites nitrogen nitrogenfertilizers nutrition pesticides physiologicaleffect plants pollution processing protection qv156n278a1972 recycling(waste rice science sewage sewagedisposalintheground sewagesludge sewagesludgeasfertilizer soilamendments soilfertility soils sols sustainableagriculture technology toxicology wa778g5622008 wastedisposal wastemanagement wasteproducts waterpollution waterquality