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前言在蔬菜产地,连作有许多问题,其中,最重要的是如何防治土壤病害。主要病害是根腐、枯萎和随萎凋产生的各种病害。而最近发现,在水田转旱田时,由藻菌类引起的芜菁根瘤病和白菜缩颈病,有多发病的趋势。为防治土壤病害,当菜苗从苗床移入菜园时就必须采取各种措施。作为土壤消毒法,主要是采用三氯硝基甲烷剂等熏蒸剂处理。但对一般的露天菜地,难于实施土壤消毒法。从安全性和操作方便角度考虑,使用高效气体药剂也有困难,尤其在靠近农家的地方,是不能使用的。
Preface There are many problems in continuous cropping of vegetables, among which the most important thing is how to prevent soil diseases. The main diseases are root rot, wilt and withered wither produce a variety of diseases. Recently, however, it has been found that there is a trend of frequent occurrence of turnip root nodule disease and cabbage necking disease caused by algae in paddy fields when they turn to dry land. In order to prevent soil diseases, various measures must be taken when vegetable seedlings move into the vegetable garden from the seedbed. As a soil disinfection method, mainly using trichloronitromethane and other fumigant treatment. However, it is difficult to apply soil disinfection method to the general open-air vegetable field. From the standpoint of safety and ease of handling, it is difficult to use highly efficient gas medicaments, especially in the areas close to farmhouses, which can not be used.