作物の養分吸収に関する動的研究(第2報) : 水稲根による放射性燐P^<32>の吸収・移動・放出に就いて

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Rice seedlings were grown by the ordinary water culture technique, the roots were then divided into two parts by the root separation method (Fig. 1) ; one dipped in the ordinary water culture solution containing P^<32>O_4 and the other in the (a) Distilled water (b) Ordinary culture solution with P and (c) Do lacking P respectively. As seen from Table 1. the efflux of P^<32> was insignificant in 48 hours in each plot, but it significantly increased in 48-96 hours, especially in "Distilled Water." The difference in the other two plots was insignificant within experimental error ; the fact might suggest almost no possible efflux of phosphoric acid by "anionic exchange." The minute efflux as contrasted to the P^<32> held in the efflux root (Table 2) might rather be in favour of some very tight combination of PO_4 in the root protoplasm, probably of organic nature. From Table 2 it may be concluded that P^<32> can remarkably move downward in the root simultaneously with the upward movement of not only water and other salts but also even of PO_4.
社団法人日本土壌肥料学会の論文
1952-06-30