Effect of soybean–wheat rotation on soil aggregation, organic nitrogen and net nitrogen mineralization characteristics: a four-year field study. Issue 10 (24th August 2023)

• Record Type: Journal Article
• Authors: Geng, Sainan; Tan, Jinfang; Han, Bengao; Shi, Wenxuan; Li, Lantao; Wang, Yilun
• Is Part Of: Archives of agronomy and soil science. Volume 69:Issue 10(2023)
• Page Start: 1955
• Page End: 1972
• Publication Date: 2023-08-24
• Subjects: Soybean–wheat rotation -- corn–wheat rotation -- soil aggregates -- soil organic N -- net N mineralization; Horticulture -- Periodicals; Soils -- Periodicals; 630.5
• DOI: 10.1080/03650340.2022.2129617
• Languages: English
• ISSNs: 0365-0340

Abstract

ABSTRACT: Long-term, excessive application of synthetic N fertilizers will reduce soil aggregate stability and N supply capacity in corn–wheat ( Zea mays L. – Triticum aestivum L.) rotation. This study aimed to determine the effects of soybean ( Glycine max L.) on soil aggregation, soil organic N (SON) and net amount of N mineralization (NANM) in wheat season compared with corn. Three rotation systems, corn–wheat (C-W), soybean–wheat (S-W) and soybean inoculated with Rhizobium -wheat (SR-W) were established in 2017. In wet screening, compared with C-W rotation, the mass proportions of large macro-aggregates (LM%) + small macro-aggregates (SM%) at 0–20 cm was increased by 51.9% and 16.6% under S-W and SR-W rotations, respectively, and was increased by 50.6% and 59.8%, respectively, in the 20–40 cm. The proportions of LM + SM-associated N (LMN% + SMN%), ammonium N (AN) and amino acid N (AAN) were higher under the S-W and SR-W rotations. Furthermore, the NANM of S-W and SR-W rotations increased by 34.1% and 28.6% compared with C-W rotation, respectively, and the non-N benefits of soybean played an important role. In conclusion, the improvement degree of soil aggregation by soybean is an important factor affecting soil N mineralization in wheat season.