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| Greenhouse gas emissions from an apple orchard with the mixed application of organic and chemical fertilizers |
| Received:December 22, 2020 |
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| KeyWord:organic fertilizer;methane;nitrous oxide;greenhouse gas intensity;dry land |
| Author Name | Affiliation | E-mail | | MA Yanting | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agro-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | ZHAO Zhiyuan | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agro-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | FENG Tianyu | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agro-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | SOMPOUVISET Thongsouk | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agro-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | KONG Xu | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agro-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China | | | ZHAI Bingnian | College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China
Key Laboratory of Plant Nutrition and the Agro-Environment in Northwest China, Ministry of Agriculture, Yangling 712100, China
Apple Experiment Station, Northwest A&F University, Baishui 715600, China | bingnianzhaitg@126.com | | ZHAO Zhengyang | Apple Experiment Station, Northwest A&F University, Baishui 715600, China | |
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| Abstract: |
| The combination of organic and inorganic fertilizers plays a key role in reducing the use of chemical fertilizers and increasing soil fertility. However, the effect of organic fertilizers relative to those of chemical fertilizers on greenhouse gas emissions in apple orchards remains unclear. Hence, an experiment was conducted to explore the temporal change in greenhouse gas emissions using a static-chamber gas chromatography technique during a long-term experiment. Four treatments were applied as follows:no fertilizer(CK), organic fertilizer only(M), chemical fertilizer only(NPK), and organic fertilizer plus inorganic fertilizer(MNPK). The principal findings were that CH4 was mainly absorbed by the soil, and the peak of N2O emission fluxes always appeared after fertilization. There were significant differences in the cumulative emissions of greenhouse gases among all treatments(P<0.05). The highest cumulative absorption of CH4 was observed in the M treatment(9.95 kg ·hm-2). Additionally, the cumulative N2O emissions in MNPK were significantly higher than those in NPK. Correlation analysis results indicated that greenhouse gas emissions were primarily driven by soil water content, air temperature, nitrate nitrogen, and ammonium nitrogen. Yield, nitrogen agronomic efficiency, the absorption of CH4 and the emissions of N2O, and the N2O emission factor were significantly enhanced, whereas greenhouse gas intensity was decreased under the MNPK treatment compared to that of NPK treatment. However, there was a non-significant difference between MNPK treatment(0.04 kg·t-1) and NPK treatment(0.06 kg·t-1) in yield -scaled CH4 absorption. Moreover, yield-scaled N2O emissions for MNPK treatment and NPK treatment were not significantly different and were 0.05 kg·t-1 and 0.07 kg·t-1, respectively. In summary, organic fertilizer combined with chemical fertilizer is conducive to the sustainable development of apple orchards while ensuring production. |
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