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| Effects of different combinations of organic nutrients and chemical fertilizers on wheat yield, nitrogen use efficiency, and soil fertility |
| Received:December 15, 2022 |
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| KeyWord:organic fertilizer;reduced chemical fertilizer;wheat yield;nitrogen use efficiency;soil fertility |
| Author Name | Affiliation | E-mail | | XIAO Qian | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control in Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | WU Sheng | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control in Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | LIU Ying | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control in Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | CAO Chi | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control in Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | | | LIAO Xia | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control in Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | xliao@ahau.edu.cn | | MA Youhua | Key Laboratory of Farmland Ecological Conservation and Pollution Prevention and Control in Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China | |
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| Abstract: |
| The effects of organic fertilizer types and substitution proportions on wheat yield, N use efficiency, and soil fertility were investigated. A field experiment was designed with the following treatments:no fertilization(CK), conventional fertilization(CN), optimized reduced fertilizer(ON), partial replacement of optimized chemical fertilizer by 15%(ONL-15%), 30%(ONL-30%)and 50%(ONL-50%) biogas slurry nitrogen, partial replacement of optimized chemical fertilizer by 30% compost nitrogen(ONC-30%)and 30% commercial organic fertilizer nitrogen(ONS-30%). The results showed that, compared with CN treatment, ON, ONL-15%, and ONL-30% treatments significantly increased wheat grain yield and fertilizer N use efficiency(NUE). Among them, the wheat yield of plots treated with ONL-15% was the highest, showing an increase of 16.18% compared to CN treated plots and 14.08% compared to the ON plots. The fertilizer NUE of the ONL-15% treatment also increased from 18.41% under the CN treatment to 36.46%, indicating that the 15% biogas slurry replacement proportion was the optimal proportion for fertilizer reduction. Under 30% substitution proportion, the effect of organic fertilizer on wheat yield varied with their types. Compared with ON treatment, biogas slurry combined application increased wheat yield and NUE, and compost and commercial organic fertilizer significantly reduced wheat yield. Compost combined application was found to promote the accumulation of soil total N, hydrolysable N, and available P, and commercial organic fertilizer effectively alleviated soil acidification and increased soil organic matter content. Combined application of organic and inorganic fertilizer reduced by 32.60% to 65.91% the nitrate nitrogen residue in topsoil and increased soil available nitrogen content. In conclusion, combined application of organic and inorganic fertilization significantly improved soil fertility; at an application rate of N 165 kg·hm-2, biogas slurry with chemical fertilizer was shown to maintain high yield, nitrogen uptake, and nitrogen use efficiency of the wheat crop. The optimal substitution proportion of biogas slurry to reduced fertilizer was 15%. |
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