论文部分内容阅读
在红壤自然状况下,模拟了施肥沟,对红壤不同污泥施肥处理的N素释放特性进行了研究。试验结果表明,干污泥配比在10%~20%时,碱解氮、铵态氮和硝态氮累计释放量分别为:25.71%~33.48%,9.57%~14.85%和4.08%~7.65%。堆肥污泥配比在20%~33%时,其累计释放量分别为13.55%~15.65%,2.03%~4.23%和3.11%~5.37%。干污泥处理的释放量大于堆肥污泥处理的释放量,释放过程变化较堆肥污泥剧烈,铵态氮和硝态氮均有明显峰值,铵态氮最大含量532.98±10mg/kg,释放量最大达10.95%;硝态氮含量最大为149.2±14mg/kg,释放量最大时为3.32%。无论是从氮的肥效角度,还是氮释放的环境风险角度考虑,污泥堆肥处理后施肥方式均优于干污泥处理施肥方式。
Under the natural conditions of red soil, the fertilization ditch was simulated to study the release characteristics of N from the different fertilizers of red soils. The results showed that the cumulative released amounts of available nitrogen, ammonium and nitrate were 25.71% -33.48%, 9.57% -14.85% and 4.08% -7.65 respectively when the proportion of dry sludge was between 10% and 20% %. When the ratio of compost sludge is from 20% to 33%, the cumulative release is from 13.55% to 15.65%, from 2.03% to 4.23% and from 3.11% to 5.37%, respectively. The release amount of dry sludge was greater than that of compost sludge treatment. The change of release process was more severe than that of composting sludge. Both ammonium nitrogen and nitrate nitrogen had obvious peak value. The maximum content of ammonium nitrogen was 532.98 ± 10mg / kg, Maximum up to 10.95%; nitrate nitrogen content of the largest 149.2 ± 14mg / kg, the largest release was 3.32%. From the point of view of nitrogen fertilizer efficiency and environmental risk of nitrogen release, the way of fertilization after sludge compost treatment is better than that of dry sludge treatment.