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Agronomy Journal Abstract -

Seedbed Tillage and Irrigation Effects on Yield of Mono- and Doublecrop Soybean and Wheat on a Silt Loam


This article in AJ

  1. Vol. 80 No. 1, p. 139-143
    Received: Apr 13, 1987

    * Corresponding author(s):
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  1. R. A. Wesley ,
  2. L. G. Heatherly,
  3. H. C. Pringle III and
  4. G. R. Tupper
  1. U SDA-ARS Field Mech. Unit, Stoneville, MS 388776-0036
    U SDA-ARS, Soybean Production Res. Unit, Stoneville, MS



Doublecropping soybean [Glycine max (L.) Merr.] and wheat (Triticum aestivum L.) is an accepted cropping system in the Midsouth. Soybean is either planted after wheat with subsoiling or disking and harrowing, or both, to prepare a seedbed, or is seeded directly into the wheat stubble. The objective of this study was to determine the yield response of ‘Forrest’ soybean (Maturity Group V) when planted in a conventional monocrop system and in conventional and no-till doublecrop systems following wheat. The three cropping systems were evaluated in both an irrigated and nonirrigated environment on a Dundee silt loam (fine-silty, mixed, thermic Aerie Ochraqualf), making a total of six treatments. The six treatments were arranged in a randomized complete-block design with four replicates, and remained in the same location for the duration of the 3-yr study. Soybean was planted at a rate of 44 kg ha−1 in rows 1 m apart, whereas wheat was drill-seeded at a rate of 101 kg ha−1 in rows 0.18 m apart. Average wheat yields for the four doublecrop treatments were not significantly different within or across years. The 3-yr average was 3475 kg ha−1. Irrigated monocrop soybean produced the highest average yield of 3165 kg ha−1, whereas nonirrigated monocrop soybean and the irrigated doublecrop soybean with either no seedbed tillage or conventional seedbed tillage averaged 2491,2596, and 2740 kg ha−1, respectively, and were statistically similar. Yields from the nonirrigated doublecrop soybean with no-till and conventional seedbed tillage were the lowest and averaged 1940 and 1909 kg ha−1, respectively. Soybean yields from all treatments in both the irrigated and nonirrigated environments decreased in a nearly linear fashion from 1984 to 1986. This was largely due to a decline in the number of seed produced, and was apparently caused by higher maximumminimum temperatures during the Rl to R5 growth periods as the experiment progressed in time.

Joint contribution of the USDA-ARS and the Mississippi Agric. and For. Exp. Stn.

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