黒ボク土および黒ボク土に施用した鉱物に対する作物のカリウム吸収反応

概要

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In a pot experiment using Andosol which has poor K supplying power, we applied three potassium-bearing minerals (biotite, muscovite and K-feldspar) blended in a mortar as the K source, and then examined K uptake among five crop species (groundnut, soybean, upland rice, maize and sunflower). Our findings are as follows. 1) The K uptake ability of groundnut is inferior to the other crops. It was indicated that groundnut mainly absorbs exchange able K. 2) Upland rice was expected to be able to absorb K more than hot HNO_3 extractable K from Andosol. Upland rice, maize and sunflower can absorb more K than hot HNO_3 extractable K from biotite. 3) The K uptake rate from the muscobite of sunflower is superior to the other species, however this doesn't indicate that sunflower can absorb more K than hot HNO_3 extract able K from muscovite. K uptake rates from the feldspar of all crops are low and there was no difference among crops. It indicated that feldspar has very little K availability, so crops can't use K-feldspar as the K source. 4) Our results provide supporting evidence that the sum of crude silicate in the shoot of crop and 2.5% acetic acid extracted silicate in the soil after harvesting is bigger than the silicate in the soil of no-plant pot for crops, especially upland rice and maize pressed weathering on Andosol and biotite. It is expected this pressure is related to K uptake by the crops.
社団法人日本土壌肥料学会の論文
2000-12-05