| Model of coupling water with fertilizer in gravel-mulched watermelon field and its optimum combination scheme |
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| DOI：10.7606/j.issn.1000-7601.2010.04.05 |
| Key Words: watermelon gravel-mulched field coupling water with fertilizer function of water and fertilizer with yield |
| Author Name | Affiliation | | MA Bo | College of Civil and Hydraulic Engineering, Ningxia University, Yinchuan, Ningxia 750021, China
Ningxia Research Center of Technology on Water-saving Irrigation and Water Resources Regulation, Yinchuan, Ningxia 750021, China
Center of Engineering Research on Efficient Utilization of Water Resources in Modern Agricultural in Arid Regions ，Yinchuan, Ningxia 750021, China | | TIAN Juncang | College of Civil and Hydraulic Engineering, Ningxia University, Yinchuan, Ningxia 750021, China
Ningxia Research Center of Technology on Water-saving Irrigation and Water Resources Regulation, Yinchuan, Ningxia 750021, China
Center of Engineering Research on Efficient Utilization of Water Resources in Modern Agricultural in Arid Regions ，Yinchuan, Ningxia 750021, China |
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| Abstract: |
| Based on the current rotary combination design method of square regression with three factors and five
levels, experiment of coupling water with fertilizer in gravel-mulched watermelon field was conducted in central arid re-
gion of Ningxia. The results show that irrigation quota is the main factor affecting watermelon yield, and the planting dis-tance was the second factor, while the nitrogen quantity was the third one. Water and nitrogen quantity interaction has certain effect, and it will get high yield when low nitrogen quantity and high imigation quota are combined , middle nitro-gen quantity and high irmrigation quota combined. Optimum combination indexes of water and fertilizer on different water-melon yield were gained through the model simulation and experiment . The optimal combination scheme of factors on different yield level of watermelon in gravel-mulched field is: (1) When watermelon yield is 12 000 ~ 15 000 kg/hm2, irri-gation quota is 48 ~ 61.5 m3/hm2 , nitrogen quantity is 24 ~ 31.5 kg/ hm2, and planting distance is 1.7~ 1.9 m;(2)When watermelon yield is 115 000~ 18 000 kg/hm2, inigation quota is 55.5~ 69 m3/hm2，nitrogen quantity is 24 ~ 30kg/ hm2，and planting distance is 1.4~ 1.6 m;(3) When watermelon yield is 18 000 ~ 21 000 kg/hm2, imigation quota is 58.5~ 72 m3/hm2, nitrogen quantity is 24 ~ 30 kg/hm2，and planting distance is 1.2~ 1.3 m. All these can provide reference for water-saving irrigation of watermelon in gravel-mulched field in central arid region of Ningxia. |
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