Cassava production requires nitrogen (N) inputs to drive processes such as protein synthesis. Nevertheless, N not taken up by cassava roots is subjected to microbial transformation resulting in nitrous oxide (N₂O) production, a potent greenhouse gas. The temporal dynamics of soil N is partially influenced by the N source (i.e., organic or inorganic fertilizer) and the synchrony between N supply and demand. This study, which was conducted in Colombia on soils with high organic carbon and phosphorus contents, aimed at monitoring N₂O emissions from cassava plots fertilized with organic (49.8 kg N ha^-1 year^-1) or inorganic fertilizers (22.7 kg N ha^-1 year^-1). Although the organic fertilizer (vermicompost) contained more than double the amount of N, cumulative N₂O emissions from organic cassava production (1.28 kg N₂O-N ha^-1) were lower than those from inorganic fertilizer-based cassava production (1.74 kg N₂O-N ha^-1) system. This finding indicates that, if crop yields can be maintained, there is potential to reduce cassava production's environmental impact through organic fertilization on highly fertile soils. However, a transition to organic fertilization depends on the availability of sufficient amounts of organic fertilizers at the farm level. The N₂O emissions in this study were higher than those predicted using the default IPCC emission factor, which confirmed the relevance of using country or regional specific emissions factors.

中文翻译：

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木薯田中一氧化二氮的排放量被有机和无机肥料修正

木薯的生产需要氮（N）输入来驱动蛋白质合成等过程。然而，未被木薯根吸收的氮会发生微生物转化，从而产生一氧化二氮（N ₂ O），这是一种有力的温室气体。土壤氮的时间动态部分受到氮源（即有机或无机肥料）和氮供需同步的影响。这项研究是在哥伦比亚对有机碳和磷含量较高的土壤进行的，旨在监测木薯田中施用有机肥（49.8 kg N ha - ¹ 年^-1）或无机肥料（22.7 kg N ha的肥料）中的N ₂ O排放量。^-1 年^-1）。尽管有机肥料（vermicompost）的氮含量增加了一倍以上，但有机木薯生产中累积的N ₂ O排放量（1.28 kg N ₂ O-N ha ^-1）低于无机木薯生产中累积的N ₂ O排放量（1.74 kg N）₂ O-N ha ^-1）系统。这一发现表明，如果能够保持农作物的产量，则有可能通过在高肥沃的土壤上进行有机肥来减少木薯生产对环境的影响。但是，向有机肥的过渡取决于农场水平上是否有足够数量的有机肥料。N ₂本研究中的O排放量高于使用默认IPCC排放因子预测的排放量，这证实了使用国家或地区特定排放因子的相关性。