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a Novartis Seeds, Inc., P.O. Box 729, Bay, AR 72411 USA
b Louisiana State Univ. Red River Res. Stn., P.O. Box 8550, Bossier City, LA 71113 USA
c Univ. of Arkansas Coop. Ext. Serv., 2201 Brookwood Dr., Little Rock, AR 72203 USA
d Dep. of Agronomy, 1150 Lilly Hall, Purdue Univ., West Lafayette, IN 47907 USA
glenn.bowers{at}seeds.novartis.com
In the southern USA, determinate soybean grown in row spacings (RS) of 50 cm or less generally produce higher yields than that grown in RS of 75 to 100 cm. However, the Early Soybean Production System (ESPS) commonly employs indeterminate cultivars in environments with limited rainfall. This study was conducted to determine whether RS affects seed yield in the ESPS. Twenty-one field experiments were conducted from 1984 to 1997 at sites in Arkansas, Louisiana, and Texas to determine the effect of RS on seed yield in the ESPS. Row spacings of 80 and 40 cm were compared in seven tests; of 75, 50, and 25 cm in six tests; of 75 and 25 cm in one test; of 100, 50, and 25 cm in four tests; and of 100 and 25 cm in three tests. One to five Maturity Group (MG) III and IV indeterminate cultivars were planted in a given test. Based on similarity of treatments and experimental designs, each field test was assigned to one of 10 environmental clusters (EC). Five EC showed a significant (17–36%) yield increase as RS narrowed. Of the other five EC, three had nonsignificant yield increases, one had virtually no yield change, and one had a nonsignificant yield decrease as RS narrowed. Yield was most responsive to RS when the total July and August rainfall ranged from 100 to 270 mm. These results suggest that narrow rows (
40 cm) should be used to optimize yields from ESPS plantings in the midsouthern USA.
Abbreviations: ANOVA, analysis of variance • EC, environmental cluster • Env, environment • ESPS, Early Soybean Production System • MG, Maturity Group • RS, row spacing(s)
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