【论文题目】Establishing nitrogen surplus benchmarks for sustainable potato production in intensive drip fertigation systems
【作者】Haibo Yang, Yunfei Di, Yuncai Hu, Hailin Zhang, Wei wang, Fei Li
【Abstract】Context: Excessive nitrogen (N) fertilization in drip fertigation potato production can lead to ecological and environmental risks in North China’s agro‑pastoral ecotone (APE). While N surplus (Nsur) is a vital indicator for sustainable N management, the Nsur benchmarks of APE remain undefined in drip fertigation potato systems. Objective: This study aimed to establish sustainable Nsur benchmarks and develop an Nsur‑Optimized Management (Nsur‑OM) method to promote sustainable production in drip fertigation potato systems. Methods: Twenty field experiments with a completely randomized design, including two N treatments, farmer practice (FP) and improved Nmin management (Nmin-OM), were conducted from 2014 to 2020 across four representative APE regions to estimate sustainable Nsur benchmarks at various yield levels. From 2021–2023, the Nsur-OM was implemented across smallholder, cooperative, and agribusiness potato producers, and its environmental impact was assessed using life cycle analysis. Results: The results demonstrated that sustainable Nsur benchmarks were 21-62 kg N ha−1 yr−1 for high yields and 63-87 kg N ha−1 yr−1 for medium yields, while low yields failed to meet sustainable development. The proposed Nsur-OM method has been proven effective and easy to implement among smallholders, cooperatives, and enterprises. Compared to farmer practices, Nsur‑OM reduced N fertilizer inputs by 21.5%-50.4%, N footprint by 20.3%-43.8%, and carbon footprint by 9.1%-25.0%, while achieving similar yields. This study provides an operational approach for transforming traditional practices toward sustainable production in drip fertigation potato systems.
【Keywords】Environmental footprint; Nitrogen balance; Nitrogen management; Nitrogen use efficiency; Potato yield
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