Green manure substitution for chemical nitrogen reduces greenhouse gas emissions and enhances yield and nitrogen uptake in rice rice cropping systems

作者：Nano Alemu Daba, Jing Huang, Zhe Shen, Tianfu Han, Ashraful Alam, Jiwen Li, Kiya Adare Tadesse, Ntagisanimana Gilbert, Erana Kebede, Tsegaye Gemechu Legesse, Shujun Liu, Lisheng Liu, Kailou Liu, Huimin Zhang · 发表于：Field Crops Research · 年份：2024 · DOI：10.1016/j.fcr.2024.109715 · 被引用次数：26 · 研究领域：Rice Cultivation and Yield Improvement、Crop Yield and Soil Fertility

Context Although nitrogen (N) is important for rice growth, its excessive use can have negative environmental effects, such as greenhouse gas (GHG) emissions. Thus, sustainable and eco-friendly rice production demands precise N management strategies. This includes the use of milk-vetch (MV) as a green manure (GM) for substitution. However, how GM substitution for chemical N fertilizer (NF) affects yield, uptake, methane (CH 4 ) emissions, nitrous oxide (N 2 O) emissions and related microbial mechanisms in rice rice cropping systems remains poorly understood. Objective The present study aimed to (i) investigate the effects of MV substitution for NF on grain yield, N uptake, and emissions of CH 4 , N 2 O, and GHG intensity; (ii) comparatively analyze the mechanistic effects of major microbial associated with CH 4 and N 2 O emissions under MV substitution for NF; and (iii) identify the optimal substitution level of NF by MV for mitigating GHG emission intensity while improving crop N uptake and yield in rice rice cropping systems. Methods To address the aforementioned knowledge gap, we conducted a two-year field experiment based on a long-term study established in 2008. Six treatments, i.e., no fertilizer (N0), farmers’ N practice (N100), N100 and MV (N100MV), 80 % N100 and MV (N80MV), 60 % N100 and MV (N60MV) and only MV, were set up in a randomized complete block design in triplicate. Results Compared with the other treatments, N80MV significantly increased early and late rice...