Nitrogen rhizodeposition by legumes and its fate in agroecosystems: A field study and literature review

• DOI: 10.1002/ldr.3729
• Publication Date: 2020-07-24T14:59:13Z
• Authors: Xiquan Wang; Yadong Yang; Kuan Pei; Jie Zhou; Leanne Peixoto; Anna Gunina; Zhaohai Zeng; Huadong Zang; Jim Rasmussen; Yakov Kuzyakov
• Keywords: Topsoil; Agroecosystem; Subsoil

Abstract Quantification of legume nitrogen (N) rhizodeposition (N derived from roots) and its fate in agroecosystems is crucial for managing soil fertility, land productivity, agriculture sustainability. In contrast to forage legumes, the N by grain legumes nearly unknown. Therefore, four transfer subsequent wheat crops was quantified using 15 stem labeling method under field conditions. The legumes: peanut, soybean, mungbean, adzuki bean amounted 25, 51, 20, 63 kg ha −1 , respectively. not affected fertilization, it 53–257% more accumulated topsoil (0–20 cm) than that subsoil (20–40 cm). However, per unit root biomass 3.5‐times as much ( p < 0.05), indicating importance fertility exploration subsoil. Remarkably, utilized 13–85% rhizodeposition, which contributed 4–20% total uptake. Combining present data with literature review, average (both legumes) 83 n = 75), one‐fourth cereals. Increasing 1 g increases 53 mg N. conclusion, sustainability legume‐based crop rotations resulting build‐up an important source crops.