Managing Nitrogen and Phosphorus Nutrients for Switchgrass Produced for Bioenergy Feedstock in Phosphorus-Deficient Soil

Author

Mohua Haque, Jon T. Biermacher, Maru K. Kering and John A. Guretzky

No 119765, 2012 Annual Meeting, February 4-7, 2012, Birmingham, Alabama from  Southern Agricultural Economics Association

Abstract: There is limited information available explaining the agronomic and economic relationships between yield and nitrogen and phosphorus applications to growing switchgrass produced in phosphorus-deficient soils. The objective of this study was to determine the effects of nitrogen and phosphorus fertilizers on feedstock yield and measures of expected total cost, gross revenue, net return, and breakeven price of feedstock produced in phosphorus-deficient soils in the southern Great Plains. Data were collected from a three-year, two-location agronomic field study conducted in south-central Oklahoma. Two discrete nitrogen treatments (0 and 134 kg ha-1) and four discrete phosphorus treatments (0, 30, 60 and 90 kg ha-1) were randomly assigned to small plots arranged in a randomized complete block designed (RCBD) study. Random effects mixed ANOVA models were used to estimate the effects of nitrogen, phosphorus and nitrogen by phosphorus interactions on feedstock yield and the economic variables specified. Results showed that, on average over site-years, switchgrass yield increases from 10.5 to 12.3 Mg ha-1 with the highest (101-kg ha-1) treatment; however, we found no statistical difference in net profitability between phosphorus treatments. Yield and net return did respond significantly to 135 kg-1 of N ha-1. Our results suggest that phosphorus-deficient soils do not seem to have the same impact on switchgrass yield and profitability as they do for the yields and profitability of other cropstraditionally grown in this region.

Keywords: bioenergy feedstock; economics; phosphorus-deficient soils; nitrogen; switchgrass; Crop Production/Industries; Environmental Economics and Policy; Production Economics (search for similar items in EconPapers)
New Economics Papers: this item is included in nep-agrand nep-env
Date: 2012-01
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