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Potassium Movement in Fallowed Soils¹

The rate and depth movement pattern of K, applied as KNO₃, was studied on two widely different fallowed soils under field conditions. Results indicate: (a) 5 weeks after treatment, the applied K was in the top 15 cm of both the Davidson scl and the Marlboro ls after 4.6 and 3.3 cm of rainfall, respectively; (b) after 14 weeks and 43 cm of rainfall on the scl soil and 17 weeks and 26 cm of rainfall on the ls soil, virtually all of the applied K was found in the top 30 cm of both soils except for the high K-rate on the loamy sand; (c) both soil texture and amount of rainfall influenced K movement; (d) the high rate of K tended to move faster and to greater depths as compared with the moderate rate; (e) irrespective of the application rate, the highest concentration of K was found in the 15 to 30 cm layer of both soils 76 weeks after application, even though above normal rainfall occurred; and (f) these data indicate that a normal application of K will not leach beyond the root zone in soils, similar to those used in these tests, during the growing season of most field crops.

Key Words: KNO₃ • leaching • soil depth • K recovery

² Associate Professor of Soil Chemistry and Professor of Soil Science, respectively. The authors wish to express their appreciation to Often l. Brooks, Superintendent, and the Staff, Southeast Georgia Branch Station, for their cooperation in this study.

Received for publication May 3, 1968.