Water distribution of mixed media in elevated strawberry cultivation
LU Jiajun1, WANG Jizhang1, LIU Jizhan1, LU Haiyan2, LI Pingping1,3
1.Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Chinese Academy of Agricultural Mechanization sciences, Beijing 100083, China; 3.College of Biology Resources and Environmental Science, Nanjing Forestry University, Nanjing, Jiangsu 210037, China
Abstract:A test platform for the cultivation of the viaduct was set up. About 10.0, 22.5, 45.0, 90.0, 120.0 mL water were irrigated by drip irrigation, three drip flow rates were set as 1.30 L/h,0.95 L/h and 0.50 L/h, and 6 characteristic water monitoring points were selected in the vertical and horizontal directions in the point profile of drip irrigation. The moisture content of each monitoring point was measured by drying method. The effects of initial water content, drip irrigation flux and drip irrigation amount on the diffusion of water in the soil profile were analyzed. The resucts show that drip irrigation volume for strawberry should not be higher than 90 mL per plant in elevated cultivation. The first 20 min is the peak of water diffusion after the end of drip irrigation, later, water diffusion rate slows down, and the substrate moisture tends to be stable at 60 min;the faster the diffusion rate of the water level, the greater the final diffusion distance, and the larger the wetting radius as the initial water content becomes greater. At three drip flow rates,the first 20 min internal matrix horizontal diffusion distance increment is 3.70 cm, 3.80 cm, 4.00 cm respectively;after 60 min the final horizontal diffusion distance increment is 6.61 cm,6.72 cm,6.90 cm respectively. There is no significant difference among the three treatments. The substrate water content at 10 cm depth of the same distance from the drip irrigation emitter is higher than that at 5 cm depth.After the end of drip irrigation,the maximum difference of the moisture content of the substrate in the groove is 36%, while the value is 24% at the flow rate of 0.50 L/h, whose cultivation groove matrix water rate is more uniform. Therefore, strawberry elevated cultivation should meet strawberry water requirements to determine suitable lower limits of irrigation. In the actual production, it is suitable for high frequency irrigation and drip irrigation quantity for strawberry should not be higher than 90.0 mL per plant. It is better to select moisture monitoring point at 10 cm depth near the root of strawberry to monitor water content of matrix.
卢佳骏, 王纪章, 刘继展, 陆海燕, 李萍萍,. 草莓高架栽培中混合基质水分分布[J]. 排灌机械工程学报, 2017, 35(6): 535-540.
LU Jiajun, WANG Jizhang, LIU Jizhan, LU Haiyan, LI Pingping,. Water distribution of mixed media in elevated strawberry cultivation. Journal of Drainage and Irrigation Machinery Engin, 2017, 35(6): 535-540.
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