PLSC204 Lecture 31: Practical Nutrient Management
17 Feb 2019
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Document Summary
Cost-effective production of high-quality plants and animals. Efficient use and conservation of nutrient resources. Protection of the environment beyond the soil. Cash grain farm - nutrient balance is even, nutrients go in and nutrients out in as crops. Livestock farm - nutrients go in, production of manure, excess nutrients going into surface and groundwater, heavy on inputs light on outputs. Instead of manure being considered valued resource, considered waste to be disposed of. Concentrated animal production, importing nutrients in form of feed, high level of output of manure. Excess nutrient runoff large source of population delmarva. Nitrate from nitrification and fertilizer / manure application easily leached into groundwater. Nitrate is much more mobile in the environmental and gets into the groundwater and is harmful when humans drink it soil cation exchange sites. Infants susceptible to methemoglobinemia (blue baby syndrome) - gets. Is not held against leaching by the from drinking water. Epa limit is 10 ppm nitrate-n per liter.
