水稲の赤枯病に関する栄養生理的研究 : 第1報水温及び加里と澱粉の施用が赤枯病の発生に及ぼす影響

概要

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Rice plants were grown on the soil of a pabby field where habitual occurrence of the "Akagare" disease was seen. Different conditions were given to the plants as regard to the temperature of the irrigation water and supply of potassium or starch to the soil. The results of the experiment are as follows:- (1) Depletion of potassium, supplying starch to the soil, and exposing the plant to warm irrigation water (36-39℃) without potassium supply, all caused retarded growth both in the top and in the root, resulting in increased affection by the disease. (2) Supplying starch to the soil increased the per cent content of FeO, and decreased the content of K_2O, MnO and especially, soluble MnO in the plants. The soluble-N/protein-N ratio of the leaf blade was increased by the same treatment. (3) The Eh value of the expressed shoot sap was lowered both by depletion of potassium and by application of starch. (4) The occurrence of the disease seemed to be highly correlative to the decrease of K_2O/N ratio in the leaf blade.
日本作物学会の論文
1954-06-30