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- W2155261068 abstract "In the Czech Republic, negative potassium (K) budget in agricultural soils is caused by non-fertilization by K and by a decline of manure application. We investigated soil available, fixed (acid-extractable, Kfix) and structural K pools in the field trial with graduated K application rate, established in 1972 at 8 sites of different climate and soils. The content of K-bearing minerals was evaluated on semi-quantitative scale by XRD diffraction. K-feldspars were a dominant source of structural K. Total soil K consisted of 1.7-7.1% of fixed K, which was in a positive relation to mixed-layer phyllosilicates. Differences in available K in treatments with K budget lower than -30 kg K/ha/year were small compared to those of fixed K. In control treatments, calculated average depletion of available K was -18 kg K/ha/year and the average depletion of fixed K was -12 kg K/ha/year; however at sites of higher altitude fixed K depletion prevailed. Fixed K accounted for 6-31% of the K budget. In negative K budget, monitoring of Kfix is advisable to avoid fertility loss of soil with low K supplying capacity." @default.
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- W2155261068 date "2014-08-31" @default.
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- W2155261068 title "Long-term effect of low potassium fertilization on its soil fractions" @default.
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- W2155261068 doi "https://doi.org/10.17221/290/2014-pse" @default.
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