Effects of Potassium and Lime Applied for Coastal Bermudagrass Production on Sandy Soil
- R. W. Cripps ,
- J. L. Young and
- A. T. Leonard
The deep sandy soils of eastern Texas are inherently low in available Ca and Mg. Also, Coastal bermudagrass [Cynodon dactylon (L.) Pers.] grown on these soils has exhibited K deficiency symptoms. This study was conducted to evaluate the effects of K fertilization and liming on (i) Coastal bermudagrass yield; (ii) plant tissue K, Ca, and Mg concentrations; and (iii) K, Ca, and Mg soil test values. The study was conducted on a Darco fine sandy loam (loamy, siliceous, thermic, Grossarenic Paleudults) from 1981 through 1983 using four rates of K fertilization (0, 140, 279, and 419 kg K ha−1 year−1) and six lime rates (0, 2.2, 3.6, 4.5, 9.0, and 18.0 Mg ha−1). Significant yield responses to both K fertilization and liming were observed in 1982 and 1983. Potassium fertilization resulted in increased plant K concentration and decreased plant Ca and Mg concentrations. Liming increased Ca and Mg concentrations. Maximum yields were obtained with K concentrations of about 22.0 g K kg−1 plant tissue. Increased plant K concentration did not depress Ca and Mg concentrations below 1.8 and 1.1 g kg−1, respectively. After 3 yr of K fertilization, soil test K values were increased only at the 419 kg K ha−1 rate. No yield response to liming was measured above 3.6 Mg lime Ha−1. At the conclusion of the study, soil pH and extractable Ca and Mg values in 3.6 Mg lime ha−1 plots were 5.3, 333 mg kg−1 and 30 mg kg−1, respectively.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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