Abstract: This study is a long-term trial of greenhouse vegetables production under three different treatments:organic,green and conventional,began in March 2002 in Quzhou Experimental Station of China Agricultural University.Soils were sampled in 0-20 cm and 20-40 cm layer four times in January,April,July and October 2009.To reveal the number and dynamic changes of soil microorganisms under different managements,conventional plate culture and colony counting method were used to determine the number of soil microorganisms.The results showed that:Organic management significantly increased the number of soil bacteria.The number of bacteria in the organic treatment is more than that in conventional control,and the number of bacteria reached a significant level in April and October in 0-20 cm soil layer.The number of bacteria in the organic management is more than that in green management and conventional control,and the number of bacteria reached a significant level in April,July and October in 20-40 cm soil layer.Organic management significantly increased the number of soil actinomycetes.Among three managements,the number of actinomycetes is the most in the organic management and the least in the conventional control in the 0-20 cm and 20-40 cm soil layer.In the 0-20 cm soil layer,the number of actinomycetes reached a significant level between the organic management and conventional control in April,July and October.In the 20-40 cm soil layer,the number of actinomycetes reached a significant level between the organic management and conventional control in October.Organic management significantly reduced the number of soil fungi.Among three managements,the number of fungi is the least in the organic management and the most in the conventional control in the 0-20 cm soil layer,the number of fungi reached a significant level between the organic management and conventional control in October.Compared with the 0-20 cm soil layer,the trend is opposite in the 20-40 cm soil layer.

Key words: Organic management, Green management, Conventional control, Soil microorganisms, Number

CLC Number: 

• S154.1