| Research on the optimal irrigation schedule of watermelon in gravel mulch field based on Jensen model |
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| DOI：10.7606/j.issn.1000-7601.2016.06.19 |
| Key Words: watermelon gravel mulch field irrigation schedules Jensen model |
| Author Name | Affiliation | | MA Bo | College of Civil and Hydraulic Engineering, Ningxia University, Yinchuan, Ningxia 750021, China
The Research Center of Engineering Technology on Water-saving Irrigation and Water Resource Regulation Ningxia, Yinchuan, Ningxia 750021, China
The Center of Engineering Research on Modern Agricultural Water Resources Efficient Utilization in Arid Region, Yinchuan, Ningxia 750021, China | | TIAN Jun-cang | College of Civil and Hydraulic Engineering, Ningxia University, Yinchuan, Ningxia 750021, China
The Research Center of Engineering Technology on Water-saving Irrigation and Water Resource Regulation Ningxia, Yinchuan, Ningxia 750021, China
The Center of Engineering Research on Modern Agricultural Water Resources Efficient Utilization in Arid Region, Yinchuan, Ningxia 750021, China |
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| Abstract: |
| The paper aimed at the problem of rational irrigation schedules and high efficiency utilization of water resources for watermelon in gravel mulch field，adopted the test pits contrast method in 2008 and 2009, using the water production function as Jensen model, analyzed the water consumption rule, key water requirement period and optimized the irrigation schedules by using Jensen model for watermelon in gravel mulch field. The results showed that: (1) The water consumtion in whole growth period of watermelon in gravel mulch field was 79.6 to 409.9 mm. (2) The order of key water demand period for watermelon was‘seedling stage>flowering and fruit setting stage>expand initial stage>expand middle stage>stretch tendril stage>expand late stage’. (3) The water sensitive index for each growth stage were: λ1=0.6171, λ2=0.2707, λ3=0.0355, λ4=0.1097, λ5=0.1390 and λ6=0.1106. (4) Through the optimal irrigation schedule found: the yield increasing effect was the most obvious when the irrigation supply was 80 to 240 mm; The high yield can be obtained when the irrigation supply reached 320 mm. The optimal irrigation schedule were: 20 to 30 mm in seedling stage, 50 to 55 mm in vine-extending stage, 40 to 45 mm in flowering and fruit setting stage, 70 mm in expand initial stage, 60 to 70 mm in expand interim stage, 60 to 65 mm in expand late stage. |
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