Scientia Agricultura Sinica ›› 2020, Vol. 53 ›› Issue (3): 486-499.doi: 10.3864/j.issn.0578-1752.2020.03.003

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY·AGRICULTURE INFORMATION TECHNOLOGY • Previous Articles     Next Articles

A Meta-Analysis of the Effects of Nitrogen Application Rates on Yield and Water Use Efficiency of Winter Wheat in Dryland of Loess Plateau

MA DengKe1,2,YIN LiNa1,3,LIU YiJian3,YANG WenJia3,DENG XiPing1,3,WANG ShiWen1,3()   

  1. 1 Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources/State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Yangling 712100, Shaanxi
    2 University of Chinese Academy of Sciences, Beijing 100049
    3 Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, Shaanxi
  • Received:2019-05-15 Accepted:2019-07-03 Online:2020-02-01 Published:2020-02-13
  • Contact: ShiWen WANG E-mail:shiwenwang@nwsuaf.edu.cn

Abstract:

【Objective】 The objective of this study was to clarify the effects of nitrogen fertilizer (N) on winter wheat yield and the optimum N level under different planting conditions in the Loess Plateau.【Method】A total of 82 field studies were obtained through literature retrieval. The effects of N on yield and water use efficiency of winter wheat in different regions, annual mean temperature, annual precipitation and plough layer organic matter content in the Loess Plateau were compared by meta-analysis. Regression analysis was used to explore the relationship between yield and N application rate, water use efficiency and N application rate in each group. 【Result】 Compared with no N application, N application improved the yield and water use efficiency of winter wheat in the Loess Plateau by 66.09% and 72.38%, respectively (P<0.05). The effect of N on yield was more prominent in the northwest than that in the southeast, and the effect of N on water use efficiency was more prominent in the southeast than in northwest. The yield of northwest reached the highest when the N application rate was 212 kg·hm -2, and the highest yield could be obtained by applying another 15 kg N·hm -2in southeast. The water use efficiency reached maximum at 232 kg N·hm -2 in northwest, while at 224 kg·hm -2 in southeast. The effects of N on yield and water use efficiency of winter wheat were more prominent in areas with average annual temperature ≤10℃. At the area of average temperature >10℃, yield and water use efficiency reached the maximum when N rates were 189 kg·hm -2 and 187 kg·hm -2, respectively. However, at the area of average temperature ≤10℃, yield and water use efficiency reached the maximum when N rates were 225 kg·hm -2 and 239 kg·hm -2, respectively. The effect of N on yield was prominent in areas of annual average precipitation ≤ 600 mm, while the change rate of water use efficiency was prominent in areas with annual precipitation >600 mm. The yield and water use efficiency reached the highest at 235 kg N·hm -2 and 244 kg N·hm -2 application rates in areas with annual precipitation <600 mm, while 235 kg·hm -2 and 250 kg·hm -2 in the area with annual precipitation >600 mm. The effect of N on yield and water use efficiency was prominent when the organic matter content in plough layer was ≤12 g·kg -1. Under the condition of topsoil organic matter >12 g·kg -1, the yield and water use efficiency tended to be highest when the N application rates were 163 kg·hm -2 and 175 kg·hm -2. The optimum N application rate was 226 kg·hm -2 when the topsoil organic matter content ≤12 g·kg -1.【Conclusion】 The optimum N application rates for high yield of winter wheat in the southeast and northwest were 227 kg·hm -2 and 212 kg·hm -2, respectively. The optimum N application rate was 188 kg·hm -2 in the area with average annual temperature >10℃, and 225 kg·hm -2 when average annual temperature ≤10℃. In the area with annual average precipitation >600 mm, the optimum N application rate was 250 kg·hm -2, and 235 kg·hm -2 when annual average precipitation ≤600 mm. The optimum N application rate was 226 kg·hm -2 under the topsoil organic matter content ≤12 g·kg -1, and 163 kg·hm -2 when the topsoil organic matter content >12 g·kg -1.

Key words: nitrogen fertilizer, winter wheat, yield, water use efficiency, meta-analysis

Fig. 1

Distribution map of winter wheat experimental sites in Loess Plateau"

Table 1

Paired experimental group number/observation number distribution of effects of nitrogen fertilizer on winter wheat yield and water use efficiency"

分区 DA 年均温 AVT (℃) 年均降水AP (mm) 耕层有机质 TOM (g·kg-1)
西北NW 东南SE ≤10 >10 ≤600 >600 ≤12 >12
产量 Y 204/368 151/385 172/284 183/469 284/570 71/183 175/293 138/345
水分利用效率 WUE 155/291 53/125 140/234 68/182 167/339 41/77 125/199 73/157

Fig. 2

Effect of nitrogen application on winter wheat yield (A) and water use efficiency (B) under different regions (b), different annual average temperature (c), different precipitation (d) and different topsoil organic matter content (e) The value of n represents the number of observations used for the analysis. The same as below"

Fig. 3

Effect of nitrogen application on yield (A) and water use efficiency (B) of winter wheat in different regions"

Fig. 4

The relationship between nitrogen rates and winter wheat yield and water use efficiency in different regions"

Fig. 5

Effect of nitrogen application on yield (A) and water use efficiency (B) of winter wheat under different annual temperature"

Fig. 6

The relationship between nitrogen rates and winter wheat yield and water use efficiency in different annual average temperature"

Fig. 7

Effect of nitrogen application on yield (A) and water use efficiency (B) of winter wheat under different annual precipitation"

Fig. 8

The relationship between nitrogen rates and winter wheat yield and water use efficiency in different annual average precipitation"

Fig. 9

Effect of nitrogen application on yield (A) and water use efficiency (B) of winter wheat under different topsoil organic matter contents"

Fig. 10

The relationship between nitrogen rates and winter wheat yield and water use efficiency in different topsoil organic matter"

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