Experimental study on rape suffering from continuous subsurface waterlogging

In order to explore drainage management in those regions vulnerable to flooding and subsurface waterlogging, experiments of rape suffering from continuous subsurface waterlogging were implemented by test-pits and small field plots. Results show that the most sensitive growing period of rape suffering from continuous subsurface waterlogging to influence crop yield is blossoming stage and blossoming-fruiting stage; normal blossoming and fruiting of rape were affected due to continuous subsurface waterlogging at blossoming-fruiting stage, it led to reduction of effective fruits and made rape yield decrease; there was a little influences upon rape yield when rape suffers from subsurface waterlogging in short time (within 7 d) in spring, reduction of yield less than 10%, but a marked influence upon rape yield was made when 2～3 subsurface waterlogging processes occurred continuously in the season, yield reduction arrived at 15.4%～36.8%. Therefore, it is of important significance for rape production that drainage management in rape field is made well in spring.