| Effects of postponed nitrogen topdressing on nitrogen uptake, utilization, and yield of spring soybean under mulched drip irrigation |
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| DOI：10.7606/j.issn.1000-7601.2026.02.12 |
| Key Words: spring soybean postponed nitrogen topdressing nodule fixation of nitrogen nitrogen use efficiency yield |
| Author Name | Affiliation | | XU Yaxin | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | XUE Lihua | Crop Research Institute, Xinjiang Academy of Agricultural Sciences, Urumqi, Xinjiang 830091, China | | WANG Cong | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | GAO Quantong | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China | | ZHANG Jianxin | College of Agronomy, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| In order to explore the effects of postponed nitrogen topdressing on the amounts of fertilizer nitrogen, symbiotic nitrogen fixation, total nitrogen accumulation, and yield of soybeans, a split\|plot experiment design was conducted in 2022 and 2023. Three nitrogen topdressing treatments, namely 0 kg·hm-2 (N0), nitrogen topdressing of 120 kg·hm-2 at the initial flowering stage (R1N120), and nitrogen topdressing of 120 kg·hm-2 at the initial podding stage (R3N120), were set as the main plots, and two soybean varieties, ‘Xindadou 27’ and ‘Xinnongdou 2’, as the sub\|plots. The effects of postponed nitrogen topdressing on the number of root nodules, dry mass of root nodules, nitrogenase activity, leghemoglobin content, nitrogen accumulation amount, and yield were studied. The results showed that compared with R1N120, R3N120 significantly increased the number of root nodules and the dry mass of root nodules (P<0.05); it significantly increased the nitrogenase activity of root nodules and the leghemoglobin content, and the performance of each treatment was N0>R3N120>R1N120. Compared with R1N120, R3N120 significantly increased the total nitrogen accumulation amount, symbiotic nitrogen fixation amount, fertilizer nitrogen uptake amount, and agronomic nitrogen use efficiency (NUE). The total nitrogen accumulation amounts of ‘Xindadou 2’ and ‘Xinnongdou 2’ increased by 8.98% and 8.96%, respectively (P<0.05). The symbiotic nitrogen fixation amounts increased by 7.65% and 12.87%, respectively (P<0.05), and the fertilizer nitrogen uptake amounts increased by 42.39% and 26.23%, respectively (P<0.05). The average yields of ‘Xindadou 27’ and ‘Xinnongdou 2’ under the R3N120 treatment reached 3 921.60 kg·hm-2 and 4 161.92 kg·hm-2, respectively, which were 7.42% and 9.34% higher than those of R1N120, respectively (P<0.05). In conclusion, the postponed nitrogen topdressing period from the R1 stage to the R3 stage significantly increased the soybean yield by increasing nodule number and dry mass, thereby enhancing symbiotic nitrogen fixation and total nitrogen accumulation in soybean plants. |
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