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ARS Home » Plains Area » Lincoln, Nebraska » Agroecosystem Management Research » Research » Publications at this Location » Publication #167448
Title: A COMPARISON OF C-COSTS FOR IRRIGATED AND DRYLAND MAIZE SYSTEMS: IMPACTS OF TRACE GAS EMISSIONS AND BIOFUELS PRODUCTION

Author
item WALTERS, DANIEL - U OF NE/LINCOLN
item GINTING, DANIEL - U OF NE/LINCOLN
item Eghball, Bahman
item DOBERMANN, A - U OF NE/LINCOLN
item CASSMAN, K - U OF NE/LINCOLN
item YANG, H - U OF NE/LINCOLN
item SCHROEDER, M - U OF NE/LINCOLN

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 7/1/2003
Publication Date: 10/1/2003
Citation: Walters, D., Ginting, D., Eghball, B., Dobermann, A., Cassman, K., Yang, H., Schroeder, M. 2003. A comparison of c-costs for irrigated and dryland maize systems: impacts of trace gas emissions and biofuels production. Agronomy Abstracts Paper No. 643639(CD-ROM).

Interpretive Summary:

Technical Abstract: To utilize manure phosphorus (P) for crop production, the amount of P that is mineralized and subsequently becomes plant available needs to be determined. A laboratory incubation study was conducted to determine P release and availability from applied swine and cattle feedlot manure in three soils. Treatments included incubation temperature (11, 18, 25, and 32 oC), P source (swine and beef cattle feedlot manure, synthetic fertilizer, and no manure or fertilizer), water regime [constant 60% water filled pore space, (WFPS), and variable water content which included four dry down cycles of 60% to 30% WFPS], time of incubation, and soils (Catlin silt loam, Sharpsburg silty clay loam, and Valentine fine sand). Incubation temperature was not a significant factor in manure P release in this study. Constant water regime resulted in more P mineralization from cattle feedlot manure than variable soil water content (P = 0.06). No significant effect of water regime was observed for the swine slurry. At the low synthetic P fertilizer application rate of 6 ug g-1, about 12 kg P ha-1, none of the applied P remained available in the Catlin soil while about 1/3 remained plant available in the Sharpsburg soil and 2/3 in the Valentine soil. Phosphorus availability was 81 to 100 % of applied cattle manure P (85% in field observation) and 62 to 100% of swine slurry P in the three soils. Phosphorus availability in the Sharpsburg soil was 100% of P in both manure types. Phosphorus availability from manure is high and manure can be used similar to inorganic P fertilizer (100% available) in soils with adequate P or in areas susceptible to P loss in runoff. In P deficient soils, a P availability of 70% should be used.