水稲の胡麻葉枯病罹病に関する栄養生理的研究(予報) : VI 日照が無機成分の吸収に及ぼす影響

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We have made a study on the influence of shading treatment in midsummer season upon the nutrient absorption of the rice plant growing in nutrient solution with and without H_2S. Result of the experiment is as follows : - (1) The shading treatment decreased the absorption of CaO, NH_3-N, MnO and H_2O, while it increased the absorption of K_2O and SiO_2. Irrespective of the amount of H_2S given the retardation of nutrient-absorption due to shading treatment was in the order K_2O < SiO_2 < P_2O_5 < MnO < NH_3-N < CaO. (2) Irrespective of the light intensity, hydrogen sulphide reduced the uptake of nutrients in the order K_2O < SiO_2 > P_2O_5 > NH_3-N > MnO > CaO and such a retardation in the uptake of nutrients due to hydrogen sulphide was less marked under shaded condition. (3) These results seem to suggest that light affects unfavorably the normal aerobic metabolism of the root, at least under high temperature and strong light intensity of midsummer, and cause the reduction in the uptake of ions possessing high values of hydration.
日本作物学会の論文
1954-06-30