水稲の散播に関する研究 : 第7報 栽植密度と追肥の多少が収量並びに収量構成要素に及ぼす影響

抄録

This expriment was done in 1965 in the same place and method as in the previous experiment (No. 6), using a variety of HOYOKU. The treatments of seeding density were 100, 150, 200 and 250 hills/m². The amount of nitrogen in the. basic fertilizer applied was 9.6 g and the top dressed nitrogen levels were 1.5 g, 3.0 g, 4.5 g and 6.0 g. It was observed that the number of panicles was influenced by the basic fertilizer as well as the top dressing, and in each density treatment, the more top dressed, the more spikelets born and the weight of 1, 000 grains increased. As far as this experiment was concerned, the seeding density of 100-150 hills/m² and the high levels of top dressing served to increase the grain yield comparatively.