Potash and lime requirements of cotton grown in rotation with peanuts
1946
Skinner, J.J. | Nelson, W.L. | Collins, E.R.
The potash and lime requirements of cotton grown in rotation with peanuts on five soil types were studied in North Carolina over a 6-year period. Applications of 24 and 48 pounds of K2O were made to cotton and applications of 0, 25, and 50 pounds of K2O to peanuts. Acid and nonacid-forming fertilizers were applied to cotton. The effect on cotton of dolomitic limestone applied in the row for peanuts was determined. Yields of cotton, nutrient uptake, and the exchangeable bases in the soil were considered. The yields of cotton were significantly increased on four of the soils studied by the use of a complete fertilizer furnishing 48 pounds of K2O per acre as compared to one furnishing 24 pounds of K2O. The soil on which there was no significant response contained 0.19 m.e. of exchangeable potassium. The other soils studied contained 0.07 to 0.10 m.e. Twenty-five pounds of K2O applied to peanuts did not greatly increase cotton yields. Fifty pounds of K2O increased the cotton yields on three soils. Forty-eight pounds of K2O applied directly to cotton gave higher yields of cotton on every soil studied than either 25 pounds or 50 pounds of K2O to peanuts in addition to 24 pounds to cotton. Peanut yields were not significantly affected by these potash treatments. These results favor applying enough potash to cotton for both cotton and peanuts when grown in rotation. Nonacid-forming fertilizers increased the yields of cotton on a soil which had a pH of 5.0, 0.24 m.e. of exchangeable magnesium, and a saturation of 23% with calcium. Dolomitic limestone applied to peanuts also increased the yields of cotton on this soil.
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