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This article in AJ

  1. Vol. 76 No. 6, p. 921-924
     
    Received: July 7, 1983


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doi:10.2134/agronj1984.00021962007600060014x

Planting Method and Plant Population Influence on Soybeans1

  1. D. L. Wright,
  2. F.M. Shokes and
  3. R. K. Sprenkel2

Abstract

Abstract

No-tillage planting of crops usually results in fewer plants per unit of row than the same planting rate with conventional planting. This research was conducted to relate soybean [Glycine max (L.) Merr.] population density under conventional and no-till plantings to yield and plant growth differences on a Norfolk sandy loam soil (fineloamy, siliceous, thermic Typic Paleudult). ‘Bragg’ soybean were planted in the field with conventional and no-till planters in 0.76 m wide rows during 1979, 1980, and 1981. Highest yields usually occurred at 20 plants m−1. Yield, plant height, seed weight, and stem diameter differed little in relation to planting method except that seed weight was lower for no-till plantings in the driest year (1981). Yield and plant height increased and seed weight and stem diameter decreased in relation to population density between 1.5 and 13 plants m−1 row, and then changed gradually to populations of 27 plants m−1 row. Adequate rainfall received during the pod-fill period of 1979 (August and September) increased yield, plant height, and seed weight more than the planting method in any year.

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