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Urea and Manure Effects on Soil Nitrogen and Corn Dry Matter Yields
Author(s) -
Xie Rongjing,
MacKenzie A. F.
Publication year - 1986
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/sssaj1986.03615995005000060025x
Subject(s) - manure , urea , zoology , dry matter , agronomy , chemistry , silage , nitrogen , nutrient , soil water , biology , ecology , organic chemistry
Fresh (FC) and composted (CC) cow ( Bos taurus ) manures, liquid hog ( Sus scrofa domesticus ) manure (HM), and urea (U) were applied as N sources for silage corn (Zea mays L., hybrid W844) production on a Chicot (Hapludalfs) and a St. Benoit soil (Eutrochrepts) at rates of 0 to 240 N ha −1 . Soil NO 3 ‐N levels were significantly increased while soil NH 4 ‐N levels were only temporary increased by N additions. Highest NO 3 ‐N levels were noted 30 and 60 d (June and July) after N applications for the St. Benoit and the Chicot soils respectively. Hog manure resulted in more NO 3 ‐N compared with FC and CC manures. One to 5 kg manure‐N was found to be equivalent to 1 kg of urea‐N in terms of increasing soil NO 3 ‐N levels at the end of growing season. Differences between surface spreading or incorporating of manures on corn dry matter yields (DMY) and N uptake were not significant. Nitrogen uptake increased with increases in N application rates and was higher with HM than with CC or FC manures. Regression between DMY or N uptake and N application rates showed linear relationships with manure‐N and quadratic relationships with urea‐N. In 1984, 1 to 4 kg manure‐N resulted in similar corn DMY as 1 kg urea‐N. Cumulative effects of treatments on yields and on nutrient uptake observed in second and third years were greater on the St. Benoit soil than on the Chicot soil.