開拓地土壌に関する研究 (II) : 阿太峯地区の土壌に就て

阿太峯地区開拓地の現地踏査を行い, 又1haに就き1点の割合で採取した土壌試料に就いて物理的化学的分析を行つた。その結果, 本地区土壌をA, Bの2土壌型に分けることが出来, A型については更に2つの亜型に分けることが出来る。これら各型土壌に就て見ると, A型土壌は礫が多く, 加えて有機質の不足, 強酸性, 可給態燐酸および置換性石灰の欠乏などの欠陥を有して居り, B型土壌はA型土壌に比べると相当改良されていることが判つた。Soil survey was made at the Adamine reclamation land in Nara Prefecture. The land covered 90 hectares in area. One site was set out at each hectare of the area. Physical and chemical analyses were carried out on the soil samples taken from the upper and lower layers of the profiles. From the results obtained the soils are classified into two types, namely, A-type and B-type, and A-type soils are further classified into two subtypes. In general the soils of this land contain many gravels, and are strongly acidic. Moreover the soils are deficient in humus, available phosphorus and exchangeable calcium. On these defects the B-type soils are much more reclaimed than A-type soils

燐の吸収移動に対するマグネシウムの影響について

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