Influence on aqueous extracts of leaves from different varieties of Gladiolus hybridus Hort on soil microorganism

In order to definite the difference of leaves which collected from different gladiolus varieties on the soil microbial quantity allelopathy,dilution plate colony counting method was used in this study.Nova Lux(A1),Gold Field(A2),Amsterdam(A3),Friendship(A4) and Red Supreme(A5) were used as the plant materials.Aqueous extracts of leaves from all varieties on soil microbial quantity were studied.The results showed that gladiolus leaf extracts had significant effects on soil microbe quantity,meanwhile,this influence had certain variety effects and concentration effects.A1,A2,and A3 had significant roles in promoting and low concentration promoting effects on influencing the soil bacteria.A3 had the largest number of bacteria which was about 4 to 5 times compared with the control when the concentration of leaf extracts was 10 g·L-1.A4 and A5 showed strong inhibitory effects.The number of bacteria was about half of the control when concentration of A5 leaf extracts was 10 g·L-1.There were inhibitory effects on fungi impact and greater difference inhibitory effects on different varieties.A4 showed strongest inhibition when the concentration of leaf extracts was 10 g·L-1 and the number of fungi was only 5% compare with the control.The influence on the amount of soil actinomycetes,only A3 showed significant increased effects at low concentration.The number of soil actinomycetes was two times compared with the control when the concentration of leaf extracts was 10 g·L-1 and other varieties had certain degree of inhibition.