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Nitrogen Fertilization of Soybeans 1
Author(s) -
Sorensen R. C.,
Penas E. J.
Publication year - 1978
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1978.00021962007000020001x
Subject(s) - human fertilization , yield (engineering) , nitrogen , agronomy , soil water , chemistry , glycine , zoology , biology , ecology , amino acid , biochemistry , materials science , organic chemistry , metallurgy
Nitrogen fertilization of soybeans ( Glycine max (L.) Merr.) has given variable results in increasing soybean yields. The objectives of this study were to determine the extent and magnitude of yield increases of soybeans from N fertilization on soils of the Sharpsburg‐Marshall association in Nebraska, and to determine factors to assist in identification of conditions conducive to N induced yield increases. Experimentation with N rates of zero to 224 kg N/ha applied to soybeans was carried out at 13 sites on farmers' fields over a 3‐year period. Yield increases were observed at 9 of the 13 sites. Plant N concentration was increased at 7 sites. Increases in yields were not necessarily related to increase in plant N content; but were closely related to increase in seed size. Where effects were observed, seed yield, plant N content, and seed size were generally linearly related to rate of N application. Regression analyses were performed to determine factors which were related to the occurrence of N response. The factors found were soil pH, soil organic matter content, and yield level.