缓释氮肥和 AM 菌剂对木薯生长和土壤氮素特征的影响

本文利用田间试验技术，研究缓释氮肥和 AM 菌剂对木薯生长和土壤氮素的影响。结果表明：纯施缓释氮肥 抑制了 30 d 的土壤硝态氮含量。与其他处理相比，基施缓释氮肥+AM 菌剂和基施尿素在 63 d 释放出了最高的硝态氮。 土壤硝态氮表现出了先升高再降低后平稳的季节变化，且施肥使其在土壤中出现最高值的时间从对照的 30 d 增加到 63 d。土壤速效氮和部分处理的土壤硝态氮与采样时间的关系可用一元二次方程显著拟合。土壤速效氮与硝态氮呈极 显著正相关（p

Effects of Slow-released Nitrogen Fertilizer and Arbuscular Mycorrhizal Fungi on Cassava Growth and Soil Nitrogen Indices

In order to test the effects of slow-released nitrogen fertilizer (SRNF) and Arbuscular Mycorrhizal Fungi (AMF) on cassava growth and soil nitrogen, a field trial was carried out. There were 8 fertilizer treatments, including urea, SRNF, AMF and their compositions. For each treatment, the soil nitrate nitrogen (NO3 – -N), the ammonium nitrogen (NH4 + -N) and available nitrogen (AN) were measured in 0 d, 31 d, 63 d, 105 d and 141 d, respectively. Results showed that, soil NO3 – -N was decreased for pure SRNF treatment at 30d, but was increased by the basal SRNF+AMF treatment at 63d. The seasonal variation of soil NO3 – -N showed an increase-decrease-stable pattern. Compared to CK (no fertilizers applied) , the highest soil NO3 – -N was prolonged from 30d to 60d in the fertilizer treatments. The correlation of soil AN or NO3 – -N for some treatments with sampling time could be described by the quadratic equation with one variable. And soil AN was significantly (p