Guan'gai paishui xuebao (Jun 2023)
Meta-analysis of the Effect of Regulated Irrigation on Yield and Irrigation Water Use Efficiency of Grapes in Northern China
Abstract
【Objective】 Regulated irrigation has become a technology widely used in semi-arid regions in northern and northwestern China. Using meta-analysis, this paper analyzes the impact regulated irrigation on yield and irrigation water use efficiency of grapes, based on data obtained from various vineyards in these regions. 【Method】 With sufficient irrigation taken as the control (CK), 316 experimental datasets collected from 59 published studies were used for analysis. Factors that influence the impact of regulated irrigation on grape yield and irrigation water use efficiency were analyzed using regression and subgroup analysis. The optimal irrigation amount for each experiment was calculated using the inverse distance weight method, from which we created an optimal regulated irrigation map for grapes in the regions. 【Result】 Compared with CK, regulated irrigation reduced the grape yield by 710.37 kg/hm2, but increased fruit quality and irrigation water use efficiency by 1.19 kg/m3. The change in irrigation water use efficiency with regulated irrigation varied with grape variety. For example, regulated irrigation increased the water use efficiency of the Hutai8 variety only by 0.62 kg/m3 (p<0.05), but the Sunshine Rose variety by 30.13 kg/m3 (p<0.05). On average, regulated irrigation increased water use efficiency of table grapes by 61% more than that of wine grapes. The impact of regulated irrigation also varied with soil texture. For loam and sandy soils, a moderate regulated irrigation during the whole growth season or at the coloring maturity stage was more efficient. 【Conclusion】 Regulated irrigation reduced the yield of grapes in northern China, but increased fruit quality and water use efficiency. The optimal irrigation amount was consistent with water deficit during the growth season of the grapes.
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