砂耕・流動法により, トマト幼植物を培養し, 完全区, 無Mg区, 無P区, 無Mg, P区を設け, P^を与えた後直ちに収穫し, その吸収並びに移動を調べた。(1) P無添加区系の植物はP添加区系に比し, 遥かに多量のP^を吸収し旦集約的に葉に集積することを知つた。(2) 以上のP^の吸収並びにその直後の移動にMgは何等の直接的な役割を果すものとは考えられない。(3) 然し, 植物体中に於いて円滑なPの化学的代謝が行われる為には, 充分な量のMgの存在が必要である。It was investigated that the influence of Mg to the absorption and translocation of P^ in the sand-cultured young tomato plants. The conclusions were as follows. 1. Phosphor deficient plants absorbed more P^ and accumulated them intensively in the leaves as compared with phosphor sufficient plants. 2. Mg had no direct influence to the absorption and the following translocation of P^. 3. It was supposed when phosphorus chemical metabolism performed without a hitch in the plants, the existence of sufficient Mg was necessary
