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Liquid Swine Manure Application to Soybean and Residual‐Year Nitrogen Supply to Corn
Author(s) -
Woli Krishna P.,
Rakshit Sudipta,
Lundvall John P.,
Sawyer John E.,
Barker Daniel W.
Publication year - 2013
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj2013.05.0161
Subject(s) - agronomy , nutrient , zoology , nitrogen , manure , stalk , zea mays , residual , fertilizer , chemistry , biology , mathematics , horticulture , organic chemistry , algorithm
Liquid swine ( Sus scrofa domesticus) manure (LSM) is a valuable source of plant nutrients; however, information on application to soybean [ Glycine max (L.) Merr.] and subsequent potential N response in residual‐year corn ( Zea mays L.) is lacking. Replicated on‐farm trials were conducted at eight sites from 2000 to 2003 in Iowa with control, low, and high LSM application rates applied to soybean. In the following year corn, four fertilizer N (FN) rates were applied within each prior‐year LSM rate. Soybean grain yield (GY) increased at 63% of sites with LSM application (mean 0.17 Mg ha −1 ), with no soybean GY reductions. Postsoybean harvest soil profile NO 3 –N increased at four sites, with mean increases across sites of 12 and 24 kg NO 3 –N ha −1 for the low and high LSM rates, respectively. Residual‐year corn GY increased at 71% of sites from the prior‐year low and high LSM rates (mean 0.6 and 1.1 Mg ha −1 ) that received no FN. The residual‐year N supply to corn was estimated at 11% of the total LSM‐N applied to soybean, the amount of postsoybean harvest profile NO 3 –N ha −1 increase from each LSM rate. Corn leaf relative chlorophyll meter (RCM) and end of season corn stalk NO 3 –N (CSNT) reflected the residual N supply, but the late spring nitrate test (LSNT) did not detect that residual N. Application of LSM to soybean can be a viable nutrient management practice; however, total‐N application should be at a rate to minimize excessive residual NO 3 –N and carryover to future crops.