| Reduced water and nitrogen inputs combined with biogas residue and slurry co\|application stabilizes maize yield via optimizing dry matter accumulation and translocation |
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| DOI：10.7606/j.issn.1000-7601.2026.04.06 |
| Key Words: maize water and nitrogen reduction combined application of biogas slurry and biogas residue dry matter translocation yield water and nitrogen use efficiency |
| Author Name | Affiliation | | WANG Weiqiang | College of Agronomy, Gansu Agricultural University, State Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | WANG Xin | College of Agronomy, Gansu Agricultural University, State Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | MENG Haofeng | College of Agronomy, Gansu Agricultural University, State Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | LI Lingling | College of Agronomy, Gansu Agricultural University, State Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | WANG Feng | College of Agronomy, Gansu Agricultural University, State Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | WANG Le | College of Agronomy, Gansu Agricultural University, State Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | XU Jing | College of Agronomy, Gansu Agricultural University, State Key Laboratory of Arid Land Crop Science, Lanzhou, Gansu 730070, China | | YUAN Jing | College of Resources and Environment, China Agricultural University, Beijing 100083, China |
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| Abstract: |
| To explore the appropriate water and nitrogen reduction rates and chemical fertilizer substitution ratio of biogas residue and biogas slurry for maize under mulched drip irrigation in the Hexi Oasis Arid Irrigation Area, a two\|year (2023-2024) field positioning experiment was carried out. Two treatments were set as controls: conventional water and nitrogen management (irrigation amount 4 050 m3·hm-2 + nitrogen application rate 360 kg·hm-2, CK) and no nitrogen application (N0). Four combined treatments of water\|nitrogen reduction coupled with biogas fertilizer substitution (with 50% of basal nitrogen replaced by biogas residue and 50% of topdressed nitrogen replaced by biogas slurry) were designed, namely 15% water reduction + 15% nitrogen reduction (I1N1), 30% water reduction + 15% nitrogen reduction (I2N1), 15% water reduction + 30% nitrogen reduction (I1N2), and 30% water reduction + 30% nitrogen reduction (I2N2). The effects of different treatments on maize photosynthetic performance, dry matter accumulation and translocation, yield formation, and water\|nitrogen use efficiency were investigated. The results showed that compared with CK, the I2N1 treatment had no significant difference in leaf area index (LAI) and population photosynthetic potential at the middle and late growth stages of maize. The dry matter translocation amounts of leaves and stems significantly increased by 9.71% and 17.72%, respectively, and their contribution rates to grain significantly increased by 9.33% and 17.35%, respectively. The maximum growth rate of dry matter accumulation significantly increased by 6.02%, and the occurrence time of the maximum growth rate was advanced by 1.9 days. Compared with CK, the I2N1 treatment showed no significant differences in yield and yield components across the two years. The two\|year average nitrogen agronomic use efficiency and partial factor productivity of nitrogen significantly increased by 20.04% and 17.05%, respectively, while the two\|year average water use efficiency and irrigation water use efficiency significantly increased by 27.40% and 43.36%, respectively. The I2N1 treatment achieved the highest net income and output\|input ratio, presenting the optimal comprehensive benefit. In conclusion, the production pattern of 30% water reduction + 15% nitrogen reduction combined with 50% biogas residue substitution for basal nitrogen and 50% biogas slurry substitution for topdressed nitrogen can realize stable yield and efficiency improvement for mulched drip\|irrigated maize in the Hexi Oasis Arid Irrigation Area by optimizing dry matter translocation and distribution as well as enhancing water and nitrogen use efficiency. |
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