Water Use Efficiency and Eco-Niche-Yield Prediction of Rainfed Wheat in China’s Loess Plateau

Qianying Pan, Xinglai Pan, Foyou Yang, Xuefei Wen, Fei Pei, Sirui Pan, Tianyuan Pan and Yinhong Shi

Journal of Agricultural Science, 2012, vol. 4, issue 1, 143

Abstract: A twenty-three year study of water use efficiency and related parameters on a 0.44 ha. rainfed wheat field resulted in the following new data- Yield averaged 2135.13±sigma841.08 (minimum 810~maximum 3923 kgha-1); Water Use Efficiency(Y/ET) = 6.23±2.06 (2.84~10.21 kgha-1mm-1); Precipitation during the fallow period = 301.7±107.6 (129.8~498.2 mm); Water storage in 5~210 cm soil layer at about sowing = 328.41±78.72 (177.3~453.8 mm); Soil evaporation during the fallow period = 195±60.14 (72.6~347.1 mm); Precipitation storage = 106.7±66.3 (-22~234.2 mm); Precipitation storage efficiency % = 32.61±16.22 (-16.9~53.3); Precipitation during the growing season = 234.6±57.39 (139.8~400.6 mm); Precipitation in May = 54.91±38.69 (8.8~142.1 mm); Water storage in 5~210 cm soil layer just after harvest averaged 220.35±46.15 (123.3~335.3 mm); EvapoTranspiration during the growing season averaged 342.6±84.29 (220.5~586.6 mm). WUE benchmarks were proposed for the first time to the region as follows- >=5 kgha-1mm-1 for very poor and poor years; >=9 kgha-1mm-1 for medium and good years; and >=12 kgha-1mm-1 for excellent years. A novel model using precipitation and soil parameters before sowing was well correlated with yields. Using the first digital clustered five eco-niche-yield types and based on the model predictions, management recommendations beforehand may help growers to approach the eco-niche-yield potentials with rational input.

Date: 2012
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