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ARS Home » Research » Publications at this Location » Publication #72457
Title: IN SITU N MINERALIZATION IN SOIL CONVERTED FROM CRP TO CROP PRODUCTION

Author
item Schomberg, Harry
item Unger, Paul

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 6/26/1996
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Nitrogen availability may limit crop growth in semi-arid regions when CRP land is returned to production. No-till, sweep till, and moldboard plow were compared for effects on N mineralization following conversion of CRP to wheat production. NO3 and NH4 were measured during the eight-month fallow period following initiation of the tillage treatments. Low rainfall and soil moisture during the initial two-month period resulted in NH4 accumulation. Nitrification increased following rains in May and June. Overall, total N mineralized during the fallow period was less than 10 kg ha-1. Low N availability without additional N fertilization reduced early wheat growth. The low rates of N mineralization and nitrification indicate that CRP land will require substantial N inputs. Producers will need to reduce vegetation and begin tillage activities early to gain the greatest benefits for water and N availability.