Effect of potassium fertilizer composition on the potassium status of soddy-podzolic soils under model experimental conditions |
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| Authors: | S G Borzenko T A Sokolova V V Prokoshev |
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| Institution: | (1) Department of Soil Chemistry, Faculty of Soil Science, Moscow State University, Vorob’evy gory, Moscow, 119992, Russia;(2) OAO Sil’vinit, ul. Mira 14, Solikamsk, Perm oblast, 618500, Russia |
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| Abstract: | A model experiment was conducted with samples from arable horizons of loamy sandy and loamy soddy-podzolic soils under laboratory conditions. The samples were stored with KCl, K2SO4, and Potassium-E was added at rates of 240 and 960 kg/ha under alternating moistening and drying for 90 days. The contents of nonexchangeable, exchangeable, and easily exchangeable potassium and the K+ activity in 1: 2.5 water suspensions were measured in the original samples and after the end of the experiment. The contents of nonexchangeable, exchangeable, and easily exchangeable potassium were found to not be reliably affected by the composition of potassium fertilizers; the K+ activity was lower when potassium was added as K2SO4 than in the cases of KCl and Potassium-E. |
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