Abstract:

Abstract：Aiming at the status quo that tobacco fields rotation is difficult on large-scale and the difficulties in soil-borne diseases control, exploring new ways of tobacco field soil treatment, this paper studied the control effects of chloropicrin soil fumigation on weeds and soil-borne diseases. The author used 99.5% chloropicrin to fumigate soil by injection method，the results show that: (1) Different dosage chloropicrin seedbed fumigation have significant control effects on amaranth, purslane, cyperus, but on indica null and void. (2)Under the vaccinated conditions, after planting 98 days, the control effects on black shank range from 68.00％ to 84.29 ％and the control effects on root-knot range from 80.66％ to 92.49％ using different dosage chloropicrin soil fumigation. (3) Under field conditions, the control effects on black shank range from 75.16 ％ to 88.15％ after planting 104 days and the control effects on root-knot range from 53.60 ％ to 65.70 ％ after planting 165 days using different dosage chloropicrin soil fumigation and the performance of the biological characteristics of tobacco can be significantly improved at the same time. Therefore, chloropicrin soil fumigation is an effective solution to control soil-borne diseases of tobacco. Chloropicrin fumigation can not control Eleusine indica (L.) Gaerth is reported firstly.