Relationship between K/Ca Ratios in the Soil Solution with the Dynamic of K in Ultisol and Vertisol of Upland Area

  • A Kasno Staf Peneliti Balai Penelitian Tanah, Pusat Penelitian dan Pengembangan Tanah dan Agroklimat, Jl. lr H. Juanda No. 98, Bogar 16123
  • Abdul Rachim Staf Pengajar Departemen Tanah, Fakultas Pertanian, lnstitut Pertanian Bogar, Jl. Meranti, Kampus IPS Darmaga, Bogar 16680
  • Iskandar Iskandar Staf Pengajar Departemen Tanah, Fakultas Pertanian, lnstitut Pertanian Bogar, Jl. Meranti, Kampus IPS Darmaga, Bogar 16680
  • J. Sri Adiningsih Staf Peneliti Balai Penelitian Tanah, Pusat Penelitian dan Pengembangan Tanah dan Agroklimat, Jl. lr H. Juanda No. 98, Bogar 16123

Abstract

The objectives of this experiment were: (1) to study the effect of K and Ca fertilization on the dynamic of K, (2) to study the relationship between the dynamic of K in the soils with corn growth, and (3) to determine the optimum K requirement on different K/Ca ratio in the soil solution. Ultisol and Vertisol from the upland areas were used for the study. The determination of K and Ca dosage was based on the maximum soil sorption. The experiment was carried out in a greenhouse using the factorial randomized complete design with three replications. Four levels K dosage and three levels Ca dosage were applied in the experiment. The C-7 hybrid of corn was selected as an indicator plant. The result showed that adding K and Ca increased the dry weight of the plant in both Ultisol and Vertisol. In Ultisol, adding of K increased the amount of exchangeable Ca, Mg and K, and water-extracted K, whereas adding of Ca increased the exchangeable Ca and Mg and water-extracted K. The optimum K requirement for Ultisol was 58 mg kg-1 for K/Ca ratio <0.03 and 88 mg kg-1 for K/Ca ratio >0.03. In Vertisol, adding of K increased the exchangeable and water-extracted K, while adding of Ca increased both exchangeable and water-extracted Ca and Mg. The optimum K requirement was 55 mg kg-1 for the K/Ca ratio <0.03 and 171 mg kg-1 for the K/Ca ratio >0.03. Water extracted Ca and Mg showed a negative relationship with the K/Ca ratio both in Ultisol and Vertisol. The positive relationship between K/Ca ratios with water-extracted K was found in Ultisol, and with both exchangeable and water-extracted K in Vertisol. The increase of the K/Ca ratio increased the critical level of exchangeable K and water-extracted K.

Keywords: K/Ca ratio, K dynamic, soil solution, Ultisol, upland, Vertisol

Downloads

Download data is not yet available.
Published
2004-04-01
How to Cite
Kasno, A., Rachim, A., Iskandar, I., & Adiningsih, J. S. (2004). Relationship between K/Ca Ratios in the Soil Solution with the Dynamic of K in Ultisol and Vertisol of Upland Area. Jurnal Ilmu Tanah Dan Lingkungan, 6(1), 7-13. https://doi.org/10.29244/jitl.6.1.7-13