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Title: Yield and dry matter productivity of Japanese and US soybean cultivars
Authors: Kawasaki, Yohei
Tanaka, Yu  kyouindb  KAKEN_id
Katsura, Keisuke
Purcell, Larry C.
Shiraiwa, Tatsuhiko  kyouindb  KAKEN_id
Author's alias: 田中, 佑
桂, 圭佑
白岩, 立彦
Keywords: Canopy coverage
Dry matter production
Radiation use efficiency
Seedfilling period
Solar radiation
Soybean (Glycine max (L.) Merrill)
Issue Date: 2-Apr-2016
Publisher: Taylor & Francis Group
Journal title: Plant Production Science
Volume: 19
Start page: 257
End page: 266
Abstract: The difference in yields of cultivars may be causing difference in soybean yield between Japan and the USA. The objective of this study was to identify the effect of the cultivar on dry matter production and to reveal the key factors causing the differences in yield by focusing utilization of solar radiation in recent Japanese and US soybean cultivars. Field experiments were conducted during two seasons in Takatsuki, Japan (34°50′), and in a single season in Fayetteville (36°04′), AR, USA. Five Japanese and 10 US cultivars were observed under near-optimal conditions in order to achieve yields as close to their physiological potential as possible. The seed yield and total aboveground dry matter (TDM) were measured at maturity as long as radiation was intercepted by the canopy. The seed yield ranged from 3.10t ha−1 to 5.91t ha−1. Throughout the three environments, the seed yield of US cultivars was significantly higher than that of Japanese cultivars. The seed yield correlated with the TDM rather than the HI with correlation coefficients from.519 to.928 for the TDM vs..175 to.800 for the HI, for each of the three environments. The higher TDM of US cultivars was caused by a higher radiation use efficiency rather than higher total intercepted radiation throughout the three environments. The seasonal change in the TDM observed in four cultivars indicated that dry matter productivity was different between cultivars, specifically during the seed-filling period.
Rights: © 2016 The Author(s). Published by Taylor & Francis. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
DOI(Published Version): 10.1080/1343943X.2015.1133235
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