Effects of Briny Wind on Rice Plants : (I) Injuries caused by the typhoons No. 12 and No. 15 in 1954

[摘要] In Sep. 1954, the typhoons No. 12 and No, 15 caused severe injuries in the rice plants cultivated on fields in the coastal districts of Hyogo Prefecture. In normal condition the leaves of rice plants contain usually about 0.4% Cl. at the heading time. After the typhoon No. 12 had passed, it was observed that the Cl. content of the leaf reached up to 9.3% at the sea-side and 0.8% at the inland that is 4km from the sea coast. The salt attached to the leaf surface had been washed away by rain. But the ratio of the amount of salt, remaining on the leaves after the rain, varied according to the distance of the field from the coast. With regard to the yield constituting factors, the number of empty grains was found to have increased, the growth of the rice kernels having been disturbed remarkably by the typhoons. It was presumed that, at the district nearest the sea-coast, the damage causing the occurrence of empty grains had been severer than that disturbing the growth of kernels, and that, at the inlands far apart from the sea, the damage disturbing the growth of kernels had been more remarkable causing the emptyness in grain. The weight of 1, 000 kernels was observed to increase according to the distance of the locality from the sea, but, at the place 4km far from the sea the weight was lighter about 20% than that of normal plants.

[学科分类] 农业科学（综合）