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| DOI：10.13522/j.cnki.ggps.2019087 |
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| The Impact of the Critical Soil Moisture Used for Scheduling Deficit Drip Irrigation on Photosynthesis, Yield and Quality of Jujube Tree |
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MA Junyong, ZHENG Guoyu, ZHOU Jianwei, LIU Zhipeng
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1. Xinjiang Academy of Agricultural and Reclamation Science, Shihezi 832000, China; 2. Shihezi Experimental Station for Crop Water Use of Ministry of Agriculture, Shihezi 832000, China; 3. College of Agricultural Engineering, Hohai University, Nanjing 210098, China
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| Abstract: |
| 【Objective】Deficit irrigation is a water-efficient irrigation method in arid and semi-arid region to improve water use efficiency, but how to determine the optimal deficiency in scheduling the irrigation remains elusive. The purpose of this paper is to examine the effect of the critical soil moisture – a soil water content to resume irrigation whenever measured soil moisture drops below it - on growth of jujube tree in a desert oasis.【Method】 Field experiment was conducted in Xinjiang, in which we compared four critical soil moistures: 40% (T1), 55% (T2), 70% (T3) and 85% (T4) of the field capacity. In each treatment, we measured photosynthesis, yield and fruit quality of the jujube at different growth stages. 【Result】Decreasing the critical soil moisture reduced net photosynthetic rate, transpiration rate and stomatal conductance, but enhanced leaf water use efficiency. Among all treatments, T3 gave the highest net photosynthetic rate and T2 was most efficient in leaf water use at all growth stages. Increasing the critical soil moisture improved fruit quality indexes such as total sugar, soluble solids and sugar-acid ratio. Single fruit weight and yield both peaked when the critical soil moisture was set at 55% of the field capacity, reaching 4.43 g and 6 832.9 kg/hm2 respectively.【Conclusion】In terms of photosynthetic rate, yield and fruit quality, setting the critical soil moisture at 55% of the field capacity can significantly improve leaf water use efficiency, yield and fruit quality of the jujube. |
| Key words: Net photosynthetic rate; stomatal conductance; transpiration rate; sugar-acid ratio; field capacity |
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