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| DOI：10.13522/j.cnki.ggps.2020013 |
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| The Effects of Regulated Deficit Drip Irrigation Coupled with Different Fertilizations on Growth, Yield and Quality of Grape |
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WEN Yue, WANG Zhenhua, LI Wenhao, DING Hongwei, ZOU Jie, CHEN Rui, ZHANG Jianli
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1. College of Water & Architectural Engineering, Shihezi University, Shihezi 832000, China; 2. Key Laboratory of Modern Water-saving Irrigation of Xinjiang Production & Construction Group, Shihezi University, Shihezi 832000, China
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| Abstract: |
| 【Background】 Excessive irrigation and fertilization is often used by farmers in China and probably other countries as an insurance to safeguard agricultural production. It is not only economically costly but also has a detrimental impact on the environment. 【Objective】 The purpose of this paper is to experimentally seek an optimal regulated drip irrigation schedule and fertilization for grape production in the extremely arid regions in Tuha basin of China. 【Method】 The field irrigation and fertilization experiments were designed using the complete two-factor test design method, and seedless white grape was used as the model plant. The deficit irrigation was introduced at shoot growth stage (W1), flowering stage (W2), berry growth (W3) or berry maturing stage (W4) respectively, with sufficient irrigation during the whole growth season taken as the control (CK). Added to each irrigation treatment were three fertilizations with the ratios of N, P2O5 and K2O fertilizers being 1∶1∶1 (F1), 2∶2∶3 (F2) and 2∶1∶2 (F3) respectively, with the total fertilizers applied in each treatment during the whole growth season being controlled at 825 kg/hm2. Overall, we had 15 treatments, each having three replicates. 【Result】 Compared to the CK, introducing deficit irrigation at the berry mature stage did not result in a significant decrease in length of new shoots, stem thickness and yield, but increased the soluble solids by 7.8% and reduced the sugar and titrable acid by 5.61% and 22.19% respectively. When irrigation was the same, compared to F3, F2 increased the length of new shoots, stem diameter and yield, soluble solids and sugar by 5.48%, 1.03%, 3.95%, 4.29% and 9.90%, respectively, while reduced the amount of titrable acid by 8.72%.【Conclusion】Introducing drip irrigation at the berry mature stage coupled with a fertilization of 235.7 kg/hm2 of N+235.7 kg/hm2 of P2O5 +353.6 kg/hm2 of K2O was most optimal, saving water and improving fruit quality of the grapes in the extremely arid areas in the Tuba basin. |
| Key words: seedless white grape; drip irrigation; regulated deficit irrigation; fertilization ratio; growth index; yield; quality |
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