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Comparing Measurements of the Effect of Residual Fertilizer Phosphorus in Some Iowa Soils
Author(s) -
Smith Charles M.,
Pesek John T.
Publication year - 1962
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/sssaj1962.03615995002600060015x
Subject(s) - fertilizer , calcareous , soil water , greenhouse , phosphorus , residual , environmental science , soil test , calcareous soils , agronomy , soil science , chemistry , mathematics , botany , biology , organic chemistry , algorithm
The accuracy of the chemical soil test (0.03 N NH 4 F in 0.025 N HCl) for predicting biological response to residual fertilizer P was determined for several Iowa soils. Significant correlations were obtained with various measurements in the field and greenhouse, including grain, total dry matter, yield of P and radioactively determined A values. Soil test P was the most highly correlated with greenhouse A values and the relationship was essentially linear over the range of levels of residual P. One regression line described this relationship for all neutral and acid soils tested but was different from that for a calcareous (pH 8.0) soil. The soil test predicted the A values equally well regardless of whether the fertilizer P had been applied 1, 2, or 3 years previously.