Effects of the Compound Microbial Fertilizers on Eucalyptus Growth and Soil Microecology

ZHANG Wen-yuan

doi:10.13651/j.cnki.fjnykj.2023.08.004

Abstract：In order to realize the reduction of chemical fertilizer and provide new fertilizer for ecological forest manage-ment,and improve the soil acidification of Eucalyptus forest land,the experiments were carried out in the sprouting forest and the newly-planted forest at the same time,the compound microbial fertilizer 1(N∶P2O5∶K2O=14∶6∶12,effective viable bacteria count of Paenibacillus in October frozen sample of Bacillus subtilis≥2.0 CFU·g-1,herein-after referred to as"Fertilizer 1"),the compound microbial fertilizer 2(N∶P2O5∶K2O=14∶4∶8,effective viable bacte-ria count of Paenibacillus in October frozen sample of Bacillus subtilis≥2.0 CFU·g-1,hereinafter referred to as"Fertilizer 2")and the conventional chemical fertilizer were applied respectively to compare the differences of Eucalyp-tus growth and soil microecology under the three fertilizer treatments.The results showed that Fertilizer 1 and Fertil-izer 2 had better growth promotion and forest land improvement effects on Eucalyptus than the conventional fertiliz-ers,and the amount of converted NPK was reduced by 15.8％and 31.6％,respectively.Compared with the conven-tional chemical fertilizer,Fertilizer 2 had better growth-promoting effect on the sprout forest after 24 months of ferti-lization,and the diameter at breast height and plant height increased by 11.2％and 7.5％,respectively.The growth-promoting effect of Fertilizer 1 on the newly-planted forest was better,and the diameter at breast height and plant height increased by 13.8％and 10.5％,respectively.The compound microbial fertilizer could promote the degrada-tion of soil organic matter into humic substance,increase the number of microbial flora,improve the soil nutrients,and significantly alleviate the soil acidification.It could be concluded that the compound microbial fertilizer could re-place chemical fertilizer for planting the Eucalyptus plantation,which had the effect of reducing weight and increasing efficiency and also improving the soil fertility.