Combining organic and inorganic nitrogen fertilisation reduces N₂O emissions from cereal crops: a comparative analysis of China and Zimbabwe

详细信息    查看全文

• 作者：George Nyamadzawo ; Yeufeng Shi…
• 关键词：Mitigation ; Nitrous oxide ; Organic and Inorganic N ; Smallholder farming systems
• 刊名：Mitigation and Adaptation Strategies for Global Change
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：22
• 期：2
• 页码：233-245
• 全文大小：
• 刊物类别：Earth and Environmental Science
• 刊物主题：Atmospheric Sciences; Climate Change Management and Policy; Environmental Management;
• 出版者：Springer Netherlands
• ISSN：1573-1596
• 卷排序：22

文摘

Agriculture is one of the major sources of nitrous oxide (N₂O), a potent greenhouse gas (GHG) whose atmospheric concentrations are estimated to increase with efforts to increase food production through increasing nitrogen (N) inputs. The objective of this study was to quantify N₂O emissions from maize (Zea mays L.) and winter wheat (Triticum aestivum L.) fields amended with inorganic, organic N and a combination of both sources (integrated management), in tropical (Zimbabwe) and temperate (China) climatic conditions. In Zimbabwe N₂O emissions were measured from maize plots, while in China emissions were measured from maize and winter wheat plots. In Zimbabwe the treatments were; (i) Control, (ii) 60 kg N ha−1 ammonium nitrate (NH₄NO₃), (iii) 120 kg N ha−1 NH₄NO₃, (iv) 60 kg ha−1 cattle (Bos primigenius) manure-N, plus 60 kg N ha−1 NH₄NO₃, (v) 60 kg N ha−1 cattle manure-N, and (vi) 120 kg N ha−1 cattle manure-N. In China, treatments were; (i) Control, (ii) 300 kg N ha−1 Urea, (iii) 92 kg N ha−1 Urea plus 65 kg ha−1 chicken (Gallus domesticus) manure-N, (iv) 100 kg N ha−1 Urea and (v) 100 kg N ha−1 control release Urea. Our results showed that under both temperate and tropical conditions, integrated nutrient management resulted in lower N₂O emissions compared to inorganic fertilizers which had higher total and yield-scale N₂O emissions. We conclude that by combining organic and inorganic N sources, smallholder farmers in both China and Zimbabwe, and other countries with similar climatic conditions, can mitigate agricultural emissions without compromising productivity.