Three alternatives of methyl bromide for soil fumigation in tomato field were studied . The results showed that the effacy of the root nematode control with biofumigation, local substrate, abamectin was different. As to the effect of alternatives on output, the output increase rates of biofumigation, local substrate, abamectin,methyl bromide compared with control are respectively 18.9%?14.05%?19.0%,22.06%. Compared with total economical benefit,the sequence are abamectin>biofumigation> methy bromide>local ...