1994年以来,镇江农科所先后从国外引进一批洋葱品种,经品比试验筛选出“KF—930”。该品种皮黄肉白,辛辣味淡,品质优,适应性强,耐贮、抗病、丰产。为探明其优质丰产栽培途径,提高出口效益,我们在江苏省农业资源综合开发句容市白兔实验区进行了不同播种期、密度及覆盖方式的栽培试验。1材料与方法1.1供试品种“KF—930”(日本提供)。1.2试验设计 试验为三因素三水平,A因素为播种期,分9月12日(A_1),9月20日(A_2),9月28日 Since 1994, Zhenjiang Agricultural Science Institute has introduced a number of onion varieties from abroad and screened “KF-930” through the ratio test. The variety of yellow leather white, spicy taste light, good quality, adaptability, storability, disease resistance, high yield. In order to explore its high-quality and high-yield cultivation methods and improve export efficiency, we conducted cultivation experiments of different sowing dates, densities and covering methods in the experimental area of ​​white rabbit in Jurong, Jiangsu Province. 1 Materials and methods 1.1 test varieties “KF-930” (Japan). 1.2 The experimental design test for the three factors and three levels, A factor for the sowing period, sub-September 12 (A_1), September 20 (A_2), September 28