| In order to find out the characteristics of deep percolation under the condition of aeolian sandy soil in Hetian and determine the suitable irrigation system of drip irrigation for radish in Hetian solar greenhouse,an irrigation experiment was carried out on Radish in Hetian solar greenhouse In this experiment,five irrigation gradients were designed:T1(low level treatment),T2(medium and low level treatment),T3(medium level treatment),T4(medium and high level treatment)and T5(high level treatment),with local farmers irrigation as CK(control treatment).The effects of different irrigation quota treatments on Radish Growth,water consumption,deep percolation,yield,water use efficiency and irrigation water use efficiency were studied,the main conclusions are as follows:(1)Under the experimental conditions,the critical values of irrigation quota for deep percolation in different growth stages of radish were 8.1 mm in seedling stage,10.4 mm in leaf growth stage and fleshy root growth stage.The deep percolation of T1-T5 treatments of autumn radish varied from 26.0 mm to254.7 mm,accounting for 9.8%to 41.0%of the irrigation quota.The deep percolation of T1-T5 treatments of Spring Radish varied from 20.8 mm to 222.0 mm,accounting for 8.3%to 37.9%of the irrigation quota.The relationship between deep percolation and irrigation quota can be fitted by quadratic function in Hetian aeolian sandy soil.(2)The average daily water consumption of each treatment in the whole growth period of radish in autumn and spring was 2.17 mm/d～3.57 mm/d and 2.96 mm/d～5.18 mm/d,respectively,which increased gradually with the increase of irrigation quota or the advance of growth period.The total water consumption of radish in autumn and spring was 241.4 mm～396.6 mm and 236.8 mm～414.3 mm,respectively The average water consumption modulus of each treatment in the above three growth stages of autumn and spring turnip were 0.15,0.26,0.59 and 0.13,0.27,0.60 respectively,and the water consumption modulus increased with the development of growth period;the crop coefficient of the whole growth period of two turnip crops varied between 0.69～1.13 and 0.66～1.15,and the crop coefficient of two turnip crops increased with the development of growth period The increase of irrigation quota showed a gradual increasing trend.(3)With the increase of irrigation quota,the yield of radish increased first and then decreased.The yield of autumn radish ranged from 84.3 t/hm~2 to 110.03 t/hm~2,and that of Spring Radish ranged from73.29 t/hm~2 to 102.5 t/hm~2,the yield of two crops of radish was the best;the quality index of two crops of radish increased first and then decreased with the increase of irrigation quota,and the most suitable irrigation quota of each quality index was different;the water use efficiency of autumn radish ranged from21.03 kg/m~3 to 34.92 kg/m~3,and that of Spring Radish ranged from 19.41 kg/m~3 to 32.99 kg/m~3.The irrigation water use efficiency of autumn radish ranged from 9.38 kg/m~3 to 31.67 kg/m~3,and that of Spring Radish ranged from 10.89 kg/m~3 to 29.21 kg/m~3.The water use efficiency of autumn radish and two crops irrigation T1 was the best,and that of Spring Radish T2 was the best.(4)The suitable irrigation system for radish irrigated with drip irrigation in solar greenhouse in Hetian area is irrigation quota 6.5 mm at seedling stage,6 times of irrigation,2～3 days of irrigation period,irrigation quota 10.4 mm at vigorous growth stage of leaf,7 times of irrigation,3～4 days of irrigation period,irrigation quota 10.4 mm at vigorous growth stage of fleshy root,22～24 times of irrigation,2～2.5days of irrigation period,gross irrigation quota 355.3 mm in autumn and 335 mm irrigation quota in spring. |
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