大白菜“五改”高产栽培技术大白菜是一季生产半年供应的冬春主菜，在蔬菜生产中占有重要位置。由于我县种植品种单一、播期偏早、施肥不合理、软腐病缺乏有效防治，大白菜产量较低，遇气候不利年份，易造成病害流行．产量降低幅度更大。为此，我们于１９９３－１９９５年... Chinese cabbage “five changes” high-yielding cultivation techniques Chinese cabbage is a mainstay of spring and winter supply of six months of production in a season, occupies an important position in the production of vegetables. As a single species in our county, sowing earlier, unreasonable fertilization, lack of effective control of soft rot disease, cabbage production is lower, in adverse weather years, easy to cause disease epidemic. Yield reduction even greater. To this end, we in 1993-1995 ...