Impacts of irrigation water amount on flue-cured tobacco yield and water use efficiency
Hu Xiujun1, Ji Xuhui2
1.Institute of Hydraulic & Environmental Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou, Zhejiang 310018, China; 2.Cixi Water Conservancy Construction Survey Design Institute Co. Ltd., Cixi, Zhejiang 315300, China
Improper irrigation period or excessive irrigation can reduce tobacco yield and cause water waste, so it is very important to explore a suitable irrigation water amount for flue-cured tobacco. In this paper, a series of experiment are carried out in a field by means of Lysimeter to study the effects of irrigation water amount on yield and water use efficiency of flue-cured tobacco. The experimental results show that the soil moisture is more greatly influenced by climatic factors, such as temperature, sunshine and so on. The soil moisture changes dramatically in(10, 20］ cm thick soil layer, while in(20, 60］ cm thick soil layer, it keeps a little variation during the whole growth period. Note that in the late maturity period the soil moisture is slightly increased in(20, 60］ cm layer because of reduced water demand by the weakened physiological activity of tobacco plants, suggesting a less irrigation water should be applied in that period. Dry mass yield of tobacco rises with increasing irrigation water amount in a certain range at the maturity stage. However, if the irrigation water amount is beyond a certain high level, the yield can be lowed, i.e. the 'diminishing returns' phenomenon occurs. Considering dry leaf yield, plant growing, water consumption and water use efficiency as a whole, the suitable irrigation water amount for flue-cured tobacco K326 should be 2 700-3 000 m3/hm2. The relationships among yield, water consumption and water use efficiency should be well balanced and coordinated in flue-cured tobacco cultivation. Under the premise of high yield, irrigation water amount should be reduced properly to achieve a compromise between high yield and water saving.
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