Guan'gai paishui xuebao (Mar 2024)
Effect of irrigation and fertilization on yield and water and fertilizer use efficiency of potato in the northwestern China: A Meta-analysis
Abstract
【Background and Objective】 Northwestern China is the national hub of potato production, with irrigation and fertilization being the key factors affecting the yield, water and fertilizer use efficiency of the potato. The objective of the paper is to systematically assess the effect of different irrigations and fertilizations on yield, water use efficiency (WUE) and fertilizer partial factor productivity (PFP) of the potato in this region. The yield and water and fertilizer use efficiencies of the potato were treated as the decision factors for deriving the optimal irrigation and fertilization. 【Method】 The study was based on meta-analysis and extensive literature review using the data obtained from 29 sources. A dataset was established, which comprised 440 observations for water-fertilizer-yield relationship, 318 for water-fertilizer-WUE, and 428 for water-fertilizer-PFP. The analysis focused on the impact of water-fertilizer management on yield and efficiency metrics of the potato for Ningxia, Gansu, Shaanxi and Inner Mongolia in the northwestern China. 【Result】 In Ningxia, moderately increasing the irrigation amount and fertilization to optimal water-fertilizer levels can increase the maximum potato yield to 14.12 t/hm2, the WUE to 2.96 kg/m3 and the PFP to 32.83 kg/kg. In Gansu, reducing fertilization to the optimal level can increase the maximum PFP to 27.58 kg/kg. In Inner Mongolia, reducing irrigation and increasing fertilization to optimal levels can increase the maximum potato yield to 17.92 t/hm2, the WUE to 3.33 kg/m3 and the PFP to 30.91 kg/kg. 【Conclusion】 The optimal irrigation and fertilization for potato production in the four provinces in the northwestern China are: 900-2 100 m3/hm2 of irrigation and 345-532 kg/hm2 of fertilization for Ningxia, 2 895-3 550 m3/hm2 of irrigation and 420-630 kg/hm2 of fertilization for Gansu; 1 650-2 940 m3/hm2 of irrigation and 415-630 kg/hm2 of fertilization for Shaanxi; 1 350-2 070 m3/hm2 of irrigation and 435-675 kg/hm2 of fertilization for Inner Mongolia. These can be used as guidelines for potato production in these regions.
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