Otros
Potassium Leaching as Affected by Soil Texture and Residual Fertilization in Tropical Soils
Date
2010-01-01Registration in:
Communications In Soil Science and Plant Analysis. Philadelphia: Taylor & Francis Inc, v. 41, n. 16, p. 1934-1943, 2010.
0010-3624
10.1080/00103624.2010.495804
WOS:000281728500005
5720775873259528
0000-0003-2001-0874
Author
Universidade Estadual Paulista (Unesp)
Institutions
Abstract
Potassium (K) leaching is affected by soil texture and available K, among other factors. In this experiment, effects of soil texture and K availability on K distribution were studied in the presence of roots, with no excess water. Soils from two 6-year field experiments on a sandy clay loam and a clay soil fertilized yearly with 0, 60, 120, and 180 kg ha-1 of K2O were accommodated in pots that received 90 kg ha-1 of K2O. Soybean was grown up to its full bloom (R2). Under field conditions, K leaching below the arable layer increased with K rates, but the effect was less noticeable in the clay soil. Potassium leaching in a sandy clay loam soil was related to soil K contents from prior fertilizations. With no excess water, in the presence of soybean roots, K distribution in the profile was significant in the lighter textured soil but was not apparent on the heavier textured soil.