A meta-analysis of the effects of nitrogen fertilizer application on maize (Zea mays L.) yield in Northwest China by Yuanbo Jiang, Haiyan Li, Wenqiong Ma, Wenjing Yu, Junxian Chen, Yalin Gao, Guangping Qi, Minhua Yin, Yanxia Kang, Yanlin Ma, Jinghai Wang, Liting Xu

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