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近年来,秸秆还田技术逐步得到普及,但由于部分农民对这一技术掌握不够全面,操作中出现了一些问题,产生负效应,具体表现为部分秸秆还田后的麦田出现出苗率低、苗黄、苗弱、死苗现象,分析其原因主要有以下几个方面。一、碳氮比失调。秸秆本身碳氮比为65:1~85:1,而适宜微生物活动的碳氮比为25:1,秸秆还田后土壤中氮素不足,使得微生物与作物争夺氮素,结果秸秆分解缓慢,麦苗因缺氮而
In recent years, the technology of straw returning has been gradually popularized. However, some farmers have not fully mastered this technology and have some problems during operation, resulting in negative effects. Some of them show low emergence rates in some wheat fields after straw returning Yellow, weak seedlings, dead seedlings phenomenon, analysis of its main reasons are the following aspects. First, the carbon-nitrogen imbalance. The carbon to nitrogen ratio of straw is 65: 1 ~ 85: 1, while the suitable ratio of carbon to nitrogen is 25: 1. After the straw returning to the soil, the nitrogen in the soil is insufficient, which makes the microbes compete with the crops for nitrogen. As a result, the straw decomposes slowly, Wheat seedlings due to nitrogen deficiency