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Plant Availability of Native and Added Potassium in Undried Soils
Author(s) -
SuarezHernandez Arturo,
Hanway J. J.
Publication year - 1974
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/sssaj1974.03615995003800010035x
Subject(s) - lolium multiflorum , soil water , potassium , chemistry , fertilizer , soil test , calcareous , zoology , agronomy , botany , environmental science , soil science , biology , organic chemistry
Undried surface and subsurface samples from 15 soils in Iowa were analyzed in the laboratory and used for a greenhouse experiment. K 2 SO 4 was added to the soil samples at rates of 0, 50, 100, 150, and 200 ppm K. Increases in NH 4 OAc‐exchangeable K due to the K fertilizer additions were equivalent to 49 to 80% and 18 to 78% of the added K in the soil samples from the 0–15 and 30–45 cm depths, respectively. Percentages of K in the first harvest of ryegrass ( Lolium multiflorum ) were highly correlated, R 2 = 0.89**, with the amounts of exchangeable K in the undried soil samples with and without additions of fertilizer K. Total plant uptake of K in six ryegrass harvests from soil samples without added K 2 SO 4 was highly correlated with and generally greater than 2.67 times the amount of exchangeable K initially present in the soil samples. Added K 2 SO 4 resulted in increases in total plant uptake of K equivalent to 42 to 97% of the added K. At a given level of exchangeable K, percentages of K in the first harvest of ryegrass grown on undried calcareous soil samples were higher than in grass grown on noncalcareous soil samples.