| Optimization of irrigation scheduling based on yield\|quality multi\|index coupling at juvenile stage of Lycium barbarum L. in gravel\|mulched field |
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| DOI：10.7606/j.issn.1000-7601.2020.01.19 |
| Key Words: Lycium barbarum L. juvenile stage gravel\|mulched field water consumption optimization of irrigation scheduling yield quality |
| Author Name | Affiliation | | MA Bo | College of Civil and Hydraulic Engineering, Ningxia University, Yinchuan, Ningxia 750021, China
2. Ningxia Research Center of Technology on Water\|saving Irrigation and Water Resource Regulation, Yinchuan, Ningxia 750021, China
Efficient Use of Water Resources in Arid Modern Agriculture Ministry of Educational Engineering Research Center, Yinchuan, Ningxia 750021, China | | HUANG Yong | College of Civil and Hydraulic Engineering, Ningxia University, Yinchuan, Ningxia 750021, China | | TIAN Juncang | College of Civil and Hydraulic Engineering, Ningxia University, Yinchuan, Ningxia 750021, China
2. Ningxia Research Center of Technology on Water\|saving Irrigation and Water Resource Regulation, Yinchuan, Ningxia 750021, China
Efficient Use of Water Resources in Arid Modern Agriculture Ministry of Educational Engineering Research Center, Yinchuan, Ningxia 750021, China |
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| Abstract: |
| In order to improve irrigation efficiency and guarantee the yield and quality of juvenile stage Lycium barbarum L. planted in gravel\|mulched field in the central arid region of Ningxia, Northwestern China, this study carried out an open field experiment with designed 3 levels of irrigating water quota including 300 m3·hm-2 as HIW, 225 m3·hm-2 as MIW, and 150 m3·hm-2 as LIW in 2017, and optimized irrigation scheduling based on ‘optimal aggregative indicator increment’ method. The results showed that the main water consumption was soil evaporation in the first\|ten days of May at the germination stage and daily water consumption was by 0.6~1.2 mm. The daily water consumption increased significantly in the middle ten days of June in the blossom stage due to temperature and leaf area index increases, the daily water consumption by 2.5~3.7 mm. The daily water consumption increased continuously in the second ten days of July for summer fruit stage, the range was 2.4~4.3 mm. The maximum daily water consumption occurred in the last ten days of July in the summer fruit middle stage by 3.2~4.7 mm. Daily water consumption reduced in middle ten days of August in the fall fruit blossom stage by 3.0~4.2 mm. The irrigating water quota had significant effection to yield (P<0.05).The maximum yield was 1 402.65 kg·hm-2 of irrigating water quota with 300 m3·hm-2. The percent of polysaccharide, β-carotene, and flavone of irrigating water quota with 225 m3·hm-2 were higher than other treatments, and by 4.56%, 0.15%, and 0.41%,respectively. The glycine betaine of irrigating water quota with 150 m3·hm-2 was the highest, and the percentage was 0.77%. The aggregative indicator increment was optimal with percent of -5.4% under β-carotene content maximum with 450mm water consumption in whole growth season. According to this result, we got optimal irrigation scheduling, from begin of full\|bloom stage, the lowest irrigation amount was 70 mm of whole stage, or lowest irrigation amount was 29 mm from middle ten days of June beginning.It was also showed that the key periods of water require of juvenile stage Lycium barbarum L planted in gravel\|mulched field were summer fruit blossom period and summer fruit stage. Therefore, it is difficult to obtain the optimal water consumption of both yield and quality indexes of juvenile stage Lycium barbarum L planted in gravel\|mulched field. However, the optimal water consumption of multiple indexes coupled with yield and quality can be obtained when the content of β-carotene is the highest, so optimization of irrigation system can achieve high quality and high yield of juvenile stage Lycium barbarum L. |
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