Abstract
(1) Absorption of P2O5 was remarkably inhibited just at the same degree as K2O. by the addition of H2S to nutrient solution when H2S was given at the first time to the plant which had been grown without H2S, whereas it was little inhibited or rather promoted after continuous addition of H2S (Fig. 1). (2) Translocation of some nutrients such as CaO and SiO2 was assumed to be retarded in part by the decreased transpiration dud to H2S. (3) From the result of a water culture experiment in which H2S was added during the period from the stage of vigorous tillering stage to that of young-ear formation, it was found that the addition of H2S gave the most unfavorable effect on the yield (weight of ears per plant) and on the resistance to the disease with the plant grown in complete nutrient solution, because of the inhibition in the absorption of many nutrients, whereas it gave less effect with the plant grown in the solutions lacking in N, K2O, SiO2 and MnO, because absorption-inhibition of lacking nutrients could not take place here (Fig. 2). Accordingly the decrease of yield and resistance to the disease caused by H2S seems to be mainly attributable to the absorption-inhibition of some nutrients such as N, K2O, SiO2 and MnO at least in this experiment.
