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USE OF VARIABLE-RATE TECHNOLOGY FOR AGRONOMIC AND ENVIRONMENTAL PHOSPHORUS-BASED LIQUID SWINE MANURE MANAGEMENT
| Citations: | 1 - 0 self |
BibTeX
@MISC{Wittry_useof,
author = {David J. Wittry and Antonio P. Mallarino},
title = {USE OF VARIABLE-RATE TECHNOLOGY FOR AGRONOMIC AND ENVIRONMENTAL PHOSPHORUS-BASED LIQUID SWINE MANURE MANAGEMENT},
year = {}
}
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Abstract
Land application is the most common method for utilizing manure produced by the livestock industry. Manure applications at rates that exceed crop P removal are increasing soil-test P (STP) in many regions. Precision agriculture methods and variable-rate (VR) application can improve nutrient management and provide an environmentally responsible method to distribute manure. This study used a striptrial methodology and precision agriculture methods to compare fixed-rate (FR) and VR manure application based on STP for soybean [Glycine max (L.) Merr.]- corn (Zea mays L.) rotations in two fields and two rotation cycles. Liquid swine manure was applied before planting soybean to supply the P requirement of the 2-year rotation, and uniform fertilizer N was applied to corn. Manure increased whole-field crop yield (P�0.05) in five site-years but the application methods did not differ. Analyses for field areas with contrasting STP showed frequent yield response to manure in low-testing areas and seldom in optimum or high-testing areas. Larger yield response to VR than to FR in low-testing field areas in one site-year did not influence the whole-field yield response significantly. On average, the VR method applied 11 % more manure compared with FR. Use of VR reduced STP variability by increasing STP more than FR in low-testing areas and reducing or not affecting STP in high-testing areas. Use of VR may not result in increased economic benefits for producers, but allows for better management of liquid manure and reduces the risk of P loss to water resources from manured fields.
Keyphrases
high-testing area precision agriculture method low-testing area low-testing field area frequent yield response whole-field crop yield liquid swine manure uniform fertilizer liquid manure application method water resource vr method rotation cycle field area utilizing manure livestock industry land application striptrial methodology many region manure application increased economic benefit vr manure application common method stp variability whole-field yield response responsible method 2-year rotation nutrient management crop removal soybean glycine max
