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Uptake of Native Potassium by Plants from Natural Soil Aggregates of Different Sizes¹

ABSTRACT

The uptake of the native K by ryegrass (Lolium multiflorum) from undried soil aggregates > 9, 5–9, 3–5, 2–3, and 1–2 mm in diameter was studied in 14 soil samples. Yields of K and percentage K in the plants were highly correlated with the exchangeable K in the undried soils, irrespective of aggregate size. Early in the cropping period, plant yields were slightly higher, and slightly more K was taken up by the plants from the smaller aggregates than from the larger aggregates.

¹ Journal Paper no. J-5838 of the Iowa Agr. & Home Econ. Exp. Sta., Ames, Iowa. Project no. 1190. Presented before Div. S-4, Soil Science Society of America, Aug. 22, 1966, Stillwater, Okla.

² Research Associate and Professor of Soils, respectively.