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Residual Value of Fertilizer Phosphorus in Selected Kansas Soils
Author(s) -
Pothuluri Jairaj V.,
Whitney David A.,
Kissel David E.
Publication year - 1991
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/sssaj1991.03615995005500020018x
Subject(s) - soil water , fertilizer , lolium perenne , agronomy , loam , phosphorus , perennial plant , environmental science , chemistry , zoology , soil science , biology , organic chemistry
Quantification of the factors affecting availability of applied P in soils would improve fertilizer‐P recommendations for maximum P efficiency. A greenhouse study was conducted to determine the soil‐test P drawdown with cropping, apparent fertilizer‐P recovery, and plant‐available P in selected Kansas soils. The 55 soils (0–15 cm layer), which ranged widely in soil‐test P concentrations and other properties, received either no P or 100 mg P kg −1 soil. Soils were cropped sequentially with perennial ryegrass ( Lolium perenne L.) and ‘Honey Chow’ hybrid sorghum‐sudan ( Sorghum bicolor [L.] Moench). Linear P drawdown slopes (Bray and Kurtz no. 1 P/Cumulative P removal) for 20 unfertilized soils (initial Bray and Kurtz no. 1 P, >28.0 mg P kg −1 ) were less than those for the same fertilized soils. The P drawdown rate for soils already high in indigenous available P was 1.4 to 1.8 times greater with P fertilization than without. Apparent fertilizer‐P recovery (fertilized — unfertilized P uptake/fertilizer P added) for 48 noncalcareous soils was from 8 to 67%. Initial Bray and Kurtz no. 1 P concentration alone accurately predicted the plant‐available P until the soil test dropped to 15 mg kg −1 for 23 unfertilized soils ( R 2 = 0.83). The R 2 increased to 0.91 when interacting variables of organic matter and silt were included.