《Table 1 Selected soil properties of the plough layer (0–20 cm) at the loess soil experimental sites

《Table 1 Selected soil properties of the plough layer (0–20 cm) at the loess soil experimental sites   提示：宽带有限、当前游客访问压缩模式
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《"Closing the nitrogen use efficiency gap and reducing the environmental impact of wheat-maize cropping on smallholder farms in the Guanzhong Plain,Northwest China"》


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The Guanzhong Plain is in the centre of Shaanxi Province，China with an altitude of approximately 500 m.This location has a warm-temperate continental monsoon climate with a mean annual precipitation of approximately 550–600 mm，of which approximately 60–70%occurs in summer and autumn（June to September）.The tested soil is a silty clay loam from a loess material，with a mean soil pH value that is generally greater than 8.0 and 8%calcium carbonate（Guo et al.1992）.Table 1 presents the basic chemical properties of the investigated soils at 120 experimental sites.The major cropping system of the region is winter wheat rotated with summer maize annually.The growing season for winter wheat is approximately 8 mon，that is，from October to June of the next year；for summer，maize is approximately 4 mon，that is，from early June to late September.Thus，maize season experiences high temperature（seasonal mean，23.8°C）and high rainfall（seasonal mean，417 mm）relative to the wheat season（9°C and 197 mm，respectively）.Wheat is flood irrigated once or twice with approximately 100 mm of water on each occasion，when necessary，and on maize one to three times during its growing season.

图表编号XD0047427500    严禁用于非法目的
绘制时间2019.01.20
作者Lü Feng-lian、HOU Miao-miao、ZHANG Hong-tao、Asif Khan、Muhammad Ayaz、QIANGJIU Ciren、HU Chang-lu、YANG Xue-yun、SUN Ben-hua、ZHANG Shu-lan
绘制单位College of Natural Resources and Environment,Northwest A&F University、Key Laboratory of Plant Nutrition and the Agro-environment in Northwest China,Ministry of Agriculture、College of Natural Resources and Environment,Northwest A&F University、Key Laborator
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