Growth and Grain Yield of Wheat in Relation to Differences in Soil Groups : III. Effects of the additional application of nitrogen or phosphoric-acid on the tiller growth and grain yield

[摘要] This research was conducted with three varieties (Asakazekomugi, Norin 61 and Norin 64) in Red Soil, Thick High-humic Andosol and Light-colored Andosol. In Red Soil the survival and grain yield of tillers was increased in three varieties by the three times of nitrogen topdressing. In Norin 61 and Norin 64 nitrogen topdressing increased extremely the emergence of TR (tillers that emerged since the middle of the tillering stage, and their survival rate was very low). This higher emergence rate of TR resulted in rank growth and increased lodging. In Asakazekomugi, nitrogen topdressing did not increase the emergence of TR and lodging, resulting in higher grain weight per spike. In the two Andosols, the emergence of tillers was increased and the grain yield of Tc (coleoptile tiller), T1, T2, and T3 (tillers in axils of the first, second and third main stem leaves) were increased by the additional application of 50kg/10a P2O5. Norin 64 had higher emergence and survival rate in T1 and higher yield than the other two varieties in Andosols which were phosphoric-acid-deficient soils. Since the T1 of Asakazekomugi and Norin 61 emerged and were ear-borne by the additional application of 50kg/10a P2O5 in Andosols, the varietal difference of grain yield was smaller than control.

[学科分类] 农业科学（综合）

[关键词] Andosol;黒ボク土;Emergence rate;出現率;Lodging;赤色土;Red Soil;倒伏;Soil type;土壌型;Spike number;品種間差異;Survival rate;ç©‚æ•°;Varietal difference;有効化率