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Vegetables are mainly cultivated through facility in early spring and late autumn in Northern of China. In the case of a serious shortage of water resources, water use efficiency of greenhouse vegetable is of an important scientific significance in both water and fertilizer management. On the basis of pan Evaporation (Ep) and real-time monitoring of soil moisture content, the amount of water irrigation adequate to big-arch shelter cucumber growth, water dissipation, yield and water use efficiency were determined through the combination of three nitrogen fertilizers including urea, urea containing nitrification inhibitors (5:1 with urea and nitrification inhibitor) and coated urea (slow fertilizer) and their various levels with 0 kg/ha, 350 kg/ha, 550 kg/ha, 750 kg/ha. The results showed that the most 10,9000 kg/ha production was gained by the treatment of 550 kg/ha urea containing inhibitors, which could increase 41.5% of a yield, 15.2% of a cumulative water consumption that was at 462.0mm and 44.7% of a water use efficiency that is at 14.11kg (dry matter)/(mmha), compared with that of control, respectively. In conclusion, the present study demonstrates that the application of moderate levels of urea containing nitrification inhibitor in greenhouse cucumber can gain higher yields and water use efficiency.

Effect of Various Nitrogen Fertilizers and Their Levels on Big-Arch Shelter Cucumber Yield and Water Use Efficiency