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Agronomy Journal Abstract -

Mono- and Double-Cropped Wheat and Grain Sorghum under Rainfed and Irrigated Conditions1


This article in AJ

  1. Vol. 78 No. 6, p. 986-990
    Received: Oct 3, 1985

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  1. R. J. Crabtree,
  2. R. G. Greenland,
  3. S. O. Mehdawi and
  4. P. L. Claypool2



Sufficient amounts and distribution of rainfall are often the major limiting crop production factors in the southern Great Plains. This is especially true for summer crops whether grown in mono- or double-cropping situations since these factors have significant impact on yields and profitability. This study was conducted at the Oklahoma Vegetable Research Station, Bixby, OK, from 1980 to 1984, on a Wynona silt loam soil (Cumulic Haplaquolls) with 0 to 1% slope. The objectives were to compare yields and net economic returns of mono- and double-cropped wheat [Triticum aestivum (L.) em. Thell] and grain sorghum [Sorghum bicolor (L.) Moench] where all wheat was produced under rainfed conditions and where mono- and double-cropped grain sorghum were produced under both rainfed and irrigated conditions. Over the 5-yr period, rainfed, monocropped wheat yielded an average of 3498 compared to 2848 kg ha−1 for rainfed, double-cropped wheat. Irrigated, conventionally tilled, monocropped grain sorghum yielded an average of 5650 compared to 4866 kg ha−1 for rainfed, conventionally tilled, monocropped grain sorghum. Irrigated, no-till, double-cropped grain sorghum yielded an average of 4976 compared to 3856 kg ha−1 for rainfed, no-till, double-cropped grain sorghum. Rainfed, monocropped wheat produced the highest net economic return per hectare of any of the five cropping systems. Net return from rainfed, conventionally tilled, monocropped grain sorghum was nearly equal to that of wheat. Irrigation increased the yields of mono- and double-cropped grain sorghum 784 and 1120 kg ha−1, respectively. However, given these yields, the price of grain sorghum would have to increase from 0.10 to 0.25 and 0.19 dollars kg−1 for mono- and double-cropped grain sorghum, respectively, before irrigation would become economically feasible.

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