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| Evapotranspiration characteristic and water saving potential of Chinese cabbage under mulched drip irrigation in cold regions |
| ZHOU Li1, YE Shuigen1*, XU Feipeng1, LI Yunkai1, CEN Jiantao2 |
| 1. College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China;2. Efficient Water Ma-nagement Office in Dam Area of Zhangjiakou, Zhangjiakou, Hebei 076450, China |
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Abstract To explore the evapotranspiration characteristic and water saving potential of Chinese cabbage under mulch drip irrigation,a research was conducted in the Irrigation Pilot Station of Zhangjiakou using the large-scale weighing lysimeter. Irrigation was applied when the soil moisture content reached its designed lower limit of irrigation. The evapotranspiration characteristic of Chinese cabbage, the soil evaporation between cabbages, and water saving potential under mulched drip irrigation were studied by comparation with drip irrigation without mulch and border irrigation. The results reveal that the evapotranspiration of Chinese cabbage under mulched drip irrigation is 214.76 mm which includes 14.76 mm at the seedling stage,73.56 mm at the rosette stage and 126.44 mm at the heading stage. The transpiration intensity during the whole growing period of Chinese cabbage is 3.64 mm/d.During the growing period of the Chinese cabbage, the soil evaporation is 41.1 mm which takes 19.14 percent of the whole water resumed. Compared to the drip irrigation without mulch and border irrigation, the resumes of water under mulched drip irrigation are decreased by 14.25 mm and 94.17 mm,the soil evaporation between Chinese cabbages is close to that of the border irrigation but 16.18mm less than that of drip irrigation without mulch, however, its yield,IWUE and WUE can arrive at 80 439.75 kg/hm2,350.24 kg/(hm2·mm)and 374.56 kg/(hm2·mm)respectively,that is, 11 152.65 kg/hm2,18.89 kg/(hm2·mm), 72.54 kg/(hm2·mm)higher than those of the drip irrigation without mulch and 14.7 kg/hm2,134.11 kg/(hm2·mm)and 114.23 kg/(hm2·mm)higher than those of the border irrigation.
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Received: 16 January 2018
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