ダイズにおける栽植様式が節位別分枝の発生と生育に及ぼす影響

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  • Effect of Planting Pattern on Development and Growth of the Branch from each Node on the Main Stem in Soybean Plants.
  • ダイズ ニ オケル サイショク ヨウシキ ガ セツイ ベツ ブン シ ノ ハッセイ ト セイイク ニ オヨボス エイキョウ

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Field experiments were conducted to investigate the effect or planting pattern on the development and growth of the branch from each node on the main stem. Soybean, cv. Tamahomare and Toyoshirome, were sown in square(35cm×36cm) or rectangular(70m×18cm) patterns, one or two seeds per hill on 20 June, 1990, and two seeds per hill on 22 June, 1991 and 1992. Gindaizu was also used in 1991 and 1992. In all three cultivars, the numbcrs of branches and nodes per plant, and yield in the square planting plot tended to be greater than those in the rectangular planting plot. Square planting compared with rectangular planting resulted in significantly higher light intensity at the ground surface of hills, but the reverse was true between rows on 26 July. On 12 August, there lationship between planting pattern and light intensity of the ground surface was similar to that on 26 June, though the light intensity were markedly lower. At the nodes 5 and 6(counted from cotylendon node) on the main stem in all three fultivars, the branching percentage was higher in the square planting plot than in rectangular planting. The number of branch nodes on nodes 3 to 6 (similar to the above) on the main stem in square planting tended to in rectangular planting. Moreover, podding efficiency on thec lower main stem nodes was higher in the square than in rectangular planting. Consequently, it was suggested that a higher yield was obtained by the square planting compared to rectangular planting as a result of the higher numbers of branches and branch nodes and higher podding efficiency in the lower nodes of the main stem due to reduced mutual shading.

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