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| DOI：10.13522/j.cnki.ggps.2019202 |
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| The Effects of Planting Patterns and Deficit Irrigation on Photosynthesis and Water Use Efficiency of Greenhouse Cucumber |
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MAO Liping, ZHAO Jing, YI Zehui, WANG Lige, JIAO Xiaoyan
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1.Institute of Vegetables, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China;2.Institute of Agricultural Environment and Resources, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China
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| Abstract: |
| 【Objective】Inappropriate planting pattern compounded by excessive irrigation and fertilization is a main problem causing the reduced water use efficiency in greenhouse cucumber production. The purpose of this paper is to elucidate the impact of different combinations of planting patterns and deficit irrigation on photosynthesis and water use efficiency of cucumber in attempts to find an improved cultivation for greenhouse cucumber production.【Method】The cultivar of “Jinyou316” was use as the model plant and we compared four deficit irrigation and planting pattern combinations: planting with equally spaced rows + 70% of conventional irrigation amount (T1), planting with alternate wide and narrow rows + 70% of conventional irrigation amount (T2), planting with equally spaced rows + conventional irrigation amount (T3), planting with alternate wide and narrow rows + conventional irrigation amount (T4). Irrigation in all treatments started five days after transplanting, and six weeks after the transplanting, we began to measure the physiological traits, photosynthesis, morphological traits and material accumulation of the plants in all treatments. We also calculated and measured the water use efficiency (WUE) and yield of the cucumber.【Result】Planting patterns did not have significant impacts on physiological traits, photosynthesis, morphological traits, material accumulation and WUE of the cucumber. Deficit irrigation led to a significant increase in solute matter content and abscisic acid (ABA) in the plant. Since deficit irrigation reduced the stomatal limit value, it reduced the net photosynthetic rate (Pn), transpiration rate (Tr), dry material accumulation and total yield by 10.75%, 15.03%, 15.46% and 12.60% respectively, while increased the WUE by 20.97%, compared to the conventional irrigation. T4 gave the highest fruit yield but the lowest water use efficiency. T1 resulted in water stress thereby reducing Pn by 13.68%, dry material accumulation by 9.41% and total yield by 9.30%, while increasing WUEET by 23.96%, compared to the control. T2 led to a significant increase in Peroxidase (POD) activity, malondialdehyde (MDA) content, soluble protein and ABA content in the leaves, and a decrease in Pn, dry material accumulation and total yield by 10.52%, 23.55% and 12.37% respectively, compared to the control; it also increased WUE by 23.96% over the control. Plant in T3 was not under water stress and its Pn, dry material accumulation, total yield and WUE were comparable to those in the control.【Conclusion】Although the deficit irrigation slightly reduced yield, it significantly improved the WUE due to the reduced water consumption. T2 was a best compromise, improving WUE by 23.96% while reducing the yield only by 9.30%. |
| Key words: Planting patterns; deficit irrigation; photosynthetic traits; water use efficiency; yield; drip irrigation; cucumber |
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