未耕地非アロフェン質黒ボク土におけるリン酸一安の肥効に対する被覆およびリン輸送の場を設定する効果

概要

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The effect of polyolefin coating on phosphorus (P) efficiency of monoammonium phosphate (MAP) in uncultivated Non-allophanic Andosol was examined using a/2000 pots in which a place for P transport from the fertilizer was set up. The place for P transport was made of unmatured lowland soil with low P fixing capacity, and its volume was 15×5×3cm, occupying about 3% of the total volume of Non-allophanic Andosol in the pot. Both dry matter yield and P uptake of Dent Corn plants were 1.3 times higher in the pots with 1.4 g P_2O_5 of polyolefin-coated (POC) MAP than in the pots with the same amount of uncoated MAP. However, the P uptake was not improved without the place for P transport even when POC-MAP was used in the uncultivated Non-allophanic Andosol. When 2.8 g P_2O_5 of POC-MAP was applied to the place for P transport, the dry matter yield was almost the same with that obtained in ordinary fields. The P_2O_5 rate of 2.8 g for one Dent Corn plant corresponds to that of 200 kg P_2O_5 per ha, and is a great reduction of P fertilizer considering that the soil was uncultivated Non-allophanic Andosol having a high P fixing capacity. However, P uptake was two-thirds of that in the ordinary fields and P efficiency by the subtraction method was 14%. Further improvement in P efficiency is desired.
社団法人日本土壌肥料学会の論文
2001-02-05