Photovoltaic Nitrogen-fixation and organic farming literature review: Difference between revisions

Revision as of 20:31, 29 January 2015

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Three criteria for good N management
1. Rate: no more N than 40% more than that removed with crop at harvest.(How second term be determined?)
2. Timing: no N for crop planted in spring (All corns are planted in spring?)
3. Method: inject or incorporate instead of broadcasting in soil surface.(What are typical inject or incorporation method?)
Trends
1. 97% planted corns received N, increased 18% percent from 2001 to 2010.
2. From 2001 to 2010, national did-not-meet-rate decrease from 41% to 31%. However, timing and method did not improve. Did-not-meet-timing increase from 32% to 35%; did-not-meet-method remained 38%.
3. N price double from 2000 to 2008, then drop from 2008 to 2010(Why?).
4. Corn receiving commercial N fertilizer dropped from 84% to 82% while receiving manure increased from 16% to 18%.
5. Farmer with manure as N source has no improvement(92%) in N-management. This may due to:
  1. Manure is used as a substitute for commercial fertilizer, due to increase price from 2001 to 2008;
  2. Manure is more difficult to manage.
Comment:
1. Why rate criteria leave such huge margin(40%)?

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 ## Why rate criteria leave such huge margin(40%)?
+=== Nitrogen Management Guidelines for Corn in Indiana ===