Early maturing soybean was evaluated for differences in radiation use efficiency values, yield, and irrigation requirements compared to late maturing soybean. Maturity Group II and VI soybean were evaluated for yield, irrigation requirements, and radiation use efficiency in 2004 at the University of Arkansas Research and Extension Center in Fayetteville, AR. Plots were planted on May 20 in a randomized complete block design at three population densities. Later maturing soybean had higher seed yields, but required more water during the season. Radiation use efficiency values were different between maturity groups.
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