Nitrogen release dynamics and carbon sequestration by legume and non-legume cover crops under pure and mixed planting conditions

Shayesteh Sadra, G. Mohammadi, F. Mondani
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Abstract

Abstract Synchronizing crop residue decomposing and releasing nitrogen with subsequent cash crop needs provides benefits for ecosystems, but it is difficult to carry out. This study aimed to investigate the trend of decomposition of vetch (Vicia sativa), rye (Secale cereale) and mixed (rye + vetch) cover crop residues as well as nitrogen release after incorporating them into the soil during 12 weeks of the potato growth season by using the mesh bag method. Vetch residues decomposed very quickly in the spring and their nitrogen is released due to their higher nitrogen content and consequently a lower Carbon/Nitrogen (C/N) ratio. However, rye residues decomposed at a slower rate compared to mixed treatment, and their nitrogen content was immobilized mainly due to a higher C/N ratio. A better understanding of cover crops residues decomposition dynamics leads to maximizing the cover crop effects and higher nutrient uptake by subsequent main crops. The results of this study showed that the input level of nitrogen fertiliser can be reduced by implementing management strategies in farming potatoes and using cover crops, which will reduce the harmful environmental effects and increase the economic benefit for farmers.
纯混作条件下豆科与非豆科覆盖作物氮释放动态及固碳
作物残茬分解释氮与后续经济作物需求同步,为生态系统带来效益,但实现难度较大。采用网袋法,研究马铃薯生长季12周内,紫薇(Vicia sativa)、黑麦(Secale cereale)和黑麦+紫薇混合覆盖作物秸秆在土壤中的分解趋势及氮素释放情况。紫薇残基在春季分解速度快,由于其含氮量较高,碳氮比较低,因此释放出大量的氮。但与混合处理相比,黑麦秸秆的分解速度较慢,其氮含量的固定主要是由于较高的碳氮比。更好地了解覆盖作物残茬分解动态,可以最大限度地发挥覆盖作物效应,提高后续主要作物对养分的吸收。本研究结果表明,在马铃薯种植和覆盖作物种植中实施管理策略,可以减少氮肥的投入水平,减少有害环境影响,提高农民的经济效益。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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