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为研究保氮剂对水葫芦堆肥进程及氮素损失的影响,以切碎的水葫芦为原料,以硫酸亚铁、腐植酸钠、过磷酸钙按75∶20∶5质量比配制成保氮剂,进行35 d的好氧堆肥试验.试验设置占堆体总质量0%(对照,CK)、1%(PN1)、2%(PN2)、3%(PN3)的保氮剂4个处理,对堆肥过程中堆体理化性质、氮组分含量、氨挥发及氮素损失率进行监测.结果表明:堆肥高温期,保氮剂处理的堆温明显高于CK,堆体含水量则在降温期显著低于CK(P<0.05).堆肥完成后,保氮剂处理的全氮、有机氮含量均显著增加,以PN3处理最高,其全氮、有机氮含量分别比CK高16.3%和13.2%;同时,PN1、PN2、PN3处理的氨挥发总量分别比CK低25.9%、31.5%、42.4%,氮素固定率则分别达31.3%、40.7%、72.2%.表明水葫芦堆肥过程中添加保氮剂可加快启动速度、缩短堆肥时间,并能减少氨挥发、氮素损失.总体上,以PN3处理效果最佳.
In order to study the effect of nitrogen-retaining agent on the compost process and nitrogen loss of water hyacinth, the chopped water hyacinth was used as raw material to prepare nitrogen-preserving agent with ferrous sulfate, sodium humate and superphosphate at a weight ratio of 75:20:5 Aerobic compost test was conducted for 35 days.A total of four treatments of nitrogen-retaining agent, which accounted for 0% (CK), 1% (PN1), 2% (PN2) and 3% , The physical and chemical properties, nitrogen content, ammonia volatilization and nitrogen loss rate of the composting process were monitored.The results showed that the composting temperature, the nitrogen retention agent treatment reactor temperature was significantly higher than the CK, the moisture content of the reactor in After the compost was completed, the content of total nitrogen and organic nitrogen of the nitrogen-assimilate treatment increased significantly, the highest was PN3, the content of total nitrogen and organic nitrogen was 16.3% higher than that of CK 13.2%, respectively. Meanwhile, the total amount of ammonia volatilization in treatments PN1, PN2 and PN3 was 25.9%, 31.5% and 42.4% lower than that of CK, respectively, and the nitrogen fixation rates were 31.3%, 40.7% and 72.2% The addition of nitrogen-retaining agent can speed up the start-up, shorten the compost time and reduce ammonia volatilization and nitrogen loss.In general, PN3 treatment is the best.