高冷地に於ける小麦の生育と収量とに関する研究 : 第3報冬期間及び早春の気温が小麦の生育収量に及ぼす影響 : 第4報冬期間及び早春の地温が小麦の生育収量に及ぼす影響

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We have reported by the statistical study that the correlation coefficients between the yield-constitutional factors of winter wheat and atmospheric and soil temperatures before and after severe winter were very high in highlands. Therefore we studied experimentally the influence of raising atmospheric and soil temperatures during December to April upon the growth and yields of wheat. The results were as follows: 1) Higher atmospheric temperature and higher soil temperature treatments in early March to late March increased the number of ripened grains per ear, probably as the results of the recovery effect resulted from the vigorous vegetative growth and also healthy differentiation induced by higher temperature. Higher temperature in early to mid-April increased the number of ears, probably as the results of effective spring tillering. By these reasons the yields were increased by the above two treatments. 2) Though higher temperature in December to February increased the number of stem in early spring period, it was decreased at the harvest time on account of the death of spikelets by subsequent cold weather. Consequently the yields were not increased by these treatment, although the growth of wheat was promoted