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Soil Tests as a Means of Predicting Response of Rape to Added N, P, and K 1
Author(s) -
Soper R. J.
Publication year - 1971
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/agronj1971.00021962006300040015x
Subject(s) - soil water , chemistry , nitrate , zoology , agronomy , environmental chemistry , soil science , environmental science , biology , organic chemistry
Soil tests were evaluated as a means of predicting response of rape to added N, P, and K in 23 field experiments on non‐fallowed soils from 1961 to 1969. Nitrate‐N content to a depth of 61 cm, NaHCO 3 ‐extractable P, and NH 4 OAc‐extractable K of soils were found to be useful in predicting yield response of rape to added N, P, and K. Rape responded to added N when NO 3 ‐N in the soil to a depth of 61 cm was >100 kg/ha, responded to added P when soils had NaHCO 3 ‐extractable P <10 ppm, and responded well to added K when soils had 35 or less ppm of NH 4 OAc‐extractable K.