Effects of fermented organic fertilizer application on soil N2O emission under the vegetable rotation in polyhouse
2021
Shao, Yalu | Chen, Jingnan | Wang, Liangkai | Hou, Maomao | Chen, Deli
Vegetable field is one of the main sources of soil nitrous oxide (N₂O) emission, yet soil N₂O emission from vegetable rotation with combined application of fermented organic fertilizer with inorganic fertilizer in polyhouse is not well evaluated. In this study, we investigated the soil N₂O emission in cabbage-tomato rotation management system under different treatments of fertilizer nitrogen (N) sources, including: 100% inorganic fertilizer (IF), 75% IF+25% fermented organic fertilizer (OF), 50% IF+50% OF, 75% IF+25% OF, 100% OF, and no fertilizer (CK). The fertilization amount of N was 180 kg ha⁻¹ to cabbage and 200 kg ha⁻¹ to tomato. Results showed that soil N₂O emission flux was in a high level during 1–3 days after basal fertilization for cabbage, and decreased as the proportions of OF increased. During the whole cabbage-tomato rotated cultivation, N₂O emission flux was positively related to soil NO₃⁻-N and NH₄⁺-N contents, with correlation coefficients of 0.72 and 0.90, respectively. A higher proportion of OF increased the soil total carbon (C), organic C and C/N ratio, but decreased the soil nitrifiers and denitrifiers. The fertilizer N loss caused by N₂O emission under different OF treatments was 1.23–2.77%, significantly (p < 0.05) lower than under 100% IF treatment (3.58%), and the loss decreased with the increase of OF proportion. Our study quantitatively revealed the N₂O emission under vegetable rotation systems with different fertilizations in polyhouses, and the overall results suggested that the higher soil pH, the lower soil mineral NO₃⁻-N and NH₄⁺-N as well as lower soil nitrifiers and denitrifiers contributed to less N₂O emission for the OF treatments.
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