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Incorporation of maize crop residue maintains soybean yield through the stimulation of nitrogen fixation rather than residue-derived nitrogen in Mollisols

文献类型： 外文期刊

作者： Xie, Zhihuang 1 ; Li, Yansheng 1 ; Yu, Zhenhua 1 ; Wang, Guanghua 1 ; Tang, Caixian 3 ; Mathesius, Ulrike 4 ; Liu, Xia 1 ;

作者机构： 1.Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Mollisols Agroecol, Harbin 150081, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.La Trobe Univ, Ctr AgriBiosci, Melbourne Campus, Bundoora, Vic 3086, Australia

4.Australian Natl Univ, Res Sch Biol, Div Plant Sci, Canberra, ACT 2601, Australia

5.Univ Massachusetts, Ctr Agr, Amherst, MA 01003 USA

6.Heilongjiang Acad Agr Sci, Soybean Res Inst, Key Lab Soybean Cultivat, Minist Agr, Harbin, Peoples R China

关键词： Glycine max L; N-15 labelling; N remobilisation; Nodule function; Residue-derived N; Symbiotically-fixed N

期刊名称：FIELD CROPS RESEARCH （ 影响因子：5.224； 五年影响因子：6.19 ）

ISSN： 0378-4290

年卷期： 2021 年 272 卷

页码：

收录情况： SCI

摘要： Crop residue amendment to soil is recommended as an effective management practice to return nutrients, especially in the maize-soybean rotation system where large amounts of maize residues are produced. Quantifying the utilisation of maize-residue N by the subsequent soybean crop is essential for optimising the N fertilisation strategy for sustainable production. However, whether and how maize residue amendment alters N acquisition in soybean plants are largely unknown. It was hypothesised that maize residue would supply N and enhance N2 fixation to meet the N requirements of subsequent soybeans. Three treatments, namely: 1) chemical fertiliser (55.2, 35.2 and 22.4 kg ha- 1 of N, P and K, respectively), 2) maize residue (8 t ha- 1), and 3) nonfertiliser were applied in a maize-soybean rotation system in a Mollisol soil. It was demonstrated that soybean seed yield in the maize-residue treatment was the same as that in the chemical fertiliser treatment, with 2.9 vs. 3.2 t ha- 1 in 2014, 2.7 vs. 2.6 t ha- 1 in 2016, and 3.0 vs. 3.1 t ha- 1 in 2018. A follow-up pot experiment using 15N-labelled residue indicated that the residue-derived N accounted for 0.5 % of the total N in soybean seeds and the proportion of symbiotically fixed N reached 82 %. The amount of fixed N during the pod-filling period in the residue treatment was 0.66 g plant-1, which was 49 % and 41 % higher than those in the chemical fertiliser and non-fertiliser treatments, respectively. The stimulation of N2 fixation was associated with an increase in fixed N per nodule and the enrichment of diazotrophs in the rhizosphere of soybean. With maize residue amendment, the increased N2-fixing capability of nodules during the reproductive period, rather than residue-derived N, fulfilled the N demand for maintaining seed yield of soybean. In the maize-soybean rotation system, maize residue amendment would facilitate the N2 fixation to partly substitute for N fertiliser for soybean production in Mollisols.

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