水稲の胡麻葉枯病罹病に関する栄養生理的研究 (予報) : XI 土壤水分及び空気湿度が無機成分の吸収と移行に及ぼす影響

概要

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To make clear the effect of soil moisture and air humidity on the absorption and translocation of nutrients, two experiments were carried out : in one experiment, plants were grown at various levels of soil moisture by sand culture method, and in another experiment, plants were grown under different air humidity during ripening period just after heading. The results obtained are as follows : : (1) Decrease in soil moisture retarded the absorption of SiO_2 and P_2O_5, and increase in air humidity diminished the absorption of SiO_2 and K_2O. (2) It was inferred that both low soil moisture and high air humidity retarded the upward translocation of SiO_2 and K_2O within the plant through the decreased transpiration, causing the decrease in the ratio of SiO_2 or K_2O content of leaf blade to that of leaf sheath and also in the ratio of SiO_2 or K_2O content of leaf to that of stem and resulted in the decrease of SiO_2 or K_2O content of leaf blade. (3) The increased susceptibility to Helminthosporium leaf spot caused by low soil moisture and high air humidity was assumed to have an intimate relation with the low ratios of SiO_2 and K_2O to N in leaf blade tissue.
日本作物学会の論文
1956-04-01