Effect of planting pattern on growth, yield and seed quality of soybean cultivar Akimiyabi lated-planted by narrow-row dense-planting
2016
Matsunami, T. (NARO Tohoku Agricultural Research Center, Morioka (Japan)) | Katayama, K.
In recent years, cv. 'Akimiyabi' which has superior lodging resistance has been released as a medium maturing variety in the Tohoku Region. This study was conducted in Akita and Iwate Prefecture in the Tohoku Region. Akimiyabi was grown singly at a fixed planting density of 26.9 plants/square m with interrow spaces of 24, 36, and 48, and interhill spaces of 15.6, 10.4, and 7.8 cm, respectively. The relative solar radiation on the ground surface was higher in the 48-cm interrow spacing plot than in the other interrow spacing plots. Shading was severer in the interhill space than in the interrow space. The 48-cm row spacing tended to decrease the number of branches during the flowering period, decreasing LAI. In contrast, the 24-cm row spacing increased the number of nodes on the main stem. Furthermore, the 24-cm and 36-cm row spacing plot showed a larger dry matter production and a larger number of ripening pods; accompanied with significantly higher yield. The seed protein content, inspection grade and seed size were not influenced by planting pattern, and the yield was closely correlated with the ripening pod number, 100-grain weight, and dry matter production. Our results suggest that when Akimiyabi is subjected to late-sowing narrow-row dense cultivation, adjusting the interhall space keeping the row space in the range of 24 cm to 36 cm is preferable to obtain a large growth volume, large pod number, and stable high yield.
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