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Dry matter accumulation and plant type of the high yielding soybean growth under converted rice paddy fields
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For the last decade the high level yields, 5t-6t/ha, max. 6.5t/ha, of soybean (cv. Okushirome) have been recorded continuously under the upland conditions converted from rice paddy fields at Saihoku Branch of the Yamagata Prefectural Agricultural Experiment Station, located in Shinjo (38'45`N, 140'18`E). In 1982 and 1983, dry matter accumulation pattern, canopy structure and light penetration for Okushirome were compared with those a few cultivars grown in a different location. Okushirome produced the highest yields in both years, 5.3t/ha in 1982 and 4.6t/ha in 1983. It had also large LAIs (about 6), small light extinction coefficients (K:0.38 and 0.42), long leaf area duration (LAD) and high harvest indices (62% and 56%) compared with those of the cultivars grown in Sapporo. Grain yield was closely correlated with number of pods (r = 0.886**), LAD (r = 0.800*) and grain filling period (r = 0.813*), regardless of year, location or cultivar. The K value was related to number of pods per maximum LAI (r = -0.796*), though not related directly to grain yield. In 1982 Okushirome showed a peculiar unique plant form that the upper 3-4 large leaves on main stem had vertical and long (25-30 cm) petioles though stem height was very short. In addition, leaflets of Okushirome did active solar tracking movements in both years from early morning to late afternoon, suggesting the relation to effective light penetration within the canopies. [AS/SS]
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 Record created 1985-06-03, last modified 2019-03-04

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