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Residual Effects of Phosphorus Fertilizer in an Irrigated Rotation in the Southwest
Author(s) -
Leamer Ross W.
Publication year - 1963
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/sssaj1963.03615995002700010024x
Subject(s) - sorghum , fertilizer , phosphorus , agronomy , hay , sorghum bicolor , environmental science , chemistry , zoology , biology , organic chemistry
Response to phosphorus fertilizer on a phosphorus‐deficient Reddish‐Brown soil was measured through 8 years. Yields, percent P in plant, and NaHCO 3 ‐extractable soil P were followed through 2 cycles of alfalfa and 2 intervening crops of sorghum. Increased yields were obtained until P equal to the application was removed in harvested crops. Alfalfa yields were closely correlated with both percent P in hay and NaHCO 3 ‐extractable soil P during the first 4 years. High yields were maintained in the second cycle of the rotation, but percent P in hay and NaHCO 3 ‐extractable soil P were at levels associated with low yields during the first cycle. Sorghum following alfalfa was not affected by N fertilizer. Second‐year sorghum benefited from N only where there was ample P.