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Irrigation for crops in a sub-humid environment

III. An irrigation scheduling model for predicting soybean water use and crop yield

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A soil water use model was linked with a model of soybean growth and yield to simulate soybean production in an area of New South Wales, Australia. The model was developed and tested against results from a 3-year soybean irrigation experiment. Good agreement was obtained between measured and predicted water use and yield for two soybean cultivars (Ruse and Bragg). In the test region summer rainfall averages 300 mm but is highly variable. Therefore the model was used to simulate soybean production using 25 years of historic rainfall data to examine the amount of irrigation water necessary to produce high yields while using both irrigation water and rainfall efficiently. It was found that to obtain high yields for the 25 years, an average of 4.7 crop irrigations were required, using 4.04 X 103 m3 ha−1 of irrigation water. Because of variations in rainfall the number of crop irrigations varied between years from 2 to 6 and the amount of irrigation water required to supplement natural rainfall varied from 1.63 to 5.14 X 103 m3 ha−1.

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Correspondence to R. C. G. Smith.

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Mason, W.K., Smith, R.C.G. Irrigation for crops in a sub-humid environment. Irrig Sci 2, 89–101 (1981). https://doi.org/10.1007/BF00270752

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  • Soil Water
  • Water Pollution
  • Irrigation Water
  • Rainfall Data
  • Rainfall Average