一、前言近年,北京地区结球白菜反季节生产形势看好,然而品质好,抗逆性强、抗病、耐抽薹综合性状优良品种不多。本实验目的,旨在于从已应用或尚未应用的结球白菜品种中筛选适宜北京地区反季节种植品种,服务于郊区生产。二、材料与方法(一)参试品种１.春露地强势、京春王、９５- I. Introduction In recent years, the counterculture production of cabbage in Beijing is optimistic, however, there are not many good varieties with good quality, strong resistance, disease resistance and bolting resistance. The purpose of this experiment, aimed at screening or selecting cultivars suitable for counter-season planting in Beijing from the cultivated cabbage cultivars that have been applied or have not yet been applied to serve suburban production. Second, materials and methods (A) test varieties 1. Spring exposed to the strong king of Beijing Spring, 95-