Effects of Effective Microorgamisms on Growth and Matrix Physicochemical Properties of Container Seedlings of Quercus rubra L.
The effects of different concentrations and substrates of EM fertilizer on the growth of container seed-lings and soil physical and chemical properties of Quercus rubra L.were investigated in order to screen out the most reasonable fertilization program.Quercus rubra L.annual container seedlings were used as the experimental material,and different concentrations of effective microbial flora(EM)were applied in the mixed substrate of yellow heart soil(S)and mushroom residue and yellow heart soil(M)(1∶4 by volume).The other treatments of perlite and yellow heart soil(P)(1∶4 by volume)without EM and yellow heart soil with compound fertilizer were set up,and the seedling height,diameter and biomass were measured on the 10th of each month from June to October,respectively.The seedling height,diameter,and biomass were measured on the 10th of each month from June to October,and the physicochemical properties of the soil were measured after the 10th of October.Each treatment promoted the growth of annual container seedlings of Quercus rubra L.When the EM dilution ratio was 50(treatment M4),the growth reached the maximum.By October,the seedling height,ground diameter,to-tal fresh weight and total dry weight reached 38.86cm,5.77mm,54.08g and 28.88g,respectively.Compared with CK,they increased by 48.6％,40.4％,81.3％and 71.1％,respectively.In all EM treatments,except for the a-vailable phosphorus of S2,S3 and S4,pH of S2 and M3,other indexes were significantly different from CK.The physicochemical properties of yellow heart soil(S treatment)and mushroom residue mixed substrate(M treat-ment)were the best when EM was applied at the highest concentration.The effect of M4 was better than that of S4,and the effect of both was better than any other effect without EM.In this experiment,the mixture of mush-room residue and yellow heart soil,the dilution ratio of EM fertilizer is 50(M4),which is the best fertilization treatment for the growth and development of Quercus rubra L.seedlings.
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