Effects of Nitrogen Content in Kitchen Waste on Fertilizing Effectiveness of Pennisetum giganteum
Taking Pennisetum giganteum as the test material,under field conditions,three concentration gradients of kitchen waste treatment (C150 t · hm-2 ,C2100 t · hm-2 ,C3200 t · hm-2 )were established,and compared them with unfertilized (CK)and nitrogen-fertilized (N1100 kg·hm-2, N2300 kg·hm-2 )conditions.The effects of kitchen waste with different nitrogen contents on soil fertility,microbial diversity,and the nutritional quality and agronomic traits of Pennisetum giganteum were studied,in order to provide reference for enhancing agricultural sustainability.The results showed that with the increase in nitrogen content in kitchen waste,soil organic matter,total nitrogen, ammonium nitrogen,nitrate nitrogen,and available potassium content increased compared to CK. Specifically,in the N2 treatment,soil organic matter,total nitrogen,and ammonium nitrogen significantly increased by 9.55％,84.09％,and 104.20％ (P<0.05),respectively,compared to CK. The C3 treatment also significantly increased available potassium content in soil by 23.84％ (P<0.05) compared to CK.Furthermore,the Pennisetum giganteum treated with kitchen waste C3 showed significant increases in plant height,stem thickness,tiller number,leaf-to-stem ratio,and biomass compared to the control group,with increases of 71.6％,36.4％,106.5％,90.9％,and 67.8％,respectively (P<0.05).The effects were comparable to those observed with nitrogen fertilizer application.In addition,all kitchen waste treatments led to varying degrees of improvement in the quality of Pennisetum giganteum compared to CK.The crude protein content in different treatments showed significant differences from CK at various time periods (P<0.05 ),and the application of kitchen waste also increased the microbial community abundance in the rhizosphere of Pennisetum giganteum.Therefore,by using Pennisetum giganteum to process kitchen waste,it was not only possible to address the environmental problems associated with kitchen waste but also achieve its resource utilization,resulting in significant environmental and economic benefits.
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