关键词: 洋葱, 有色地膜, 地温, 生长, 产量

Abstract: Effect of coloured plastic film mulch on soil temperature,onion growth and yield were investigated in this study.The results indicated that transparent plastic film mulch could increase soil temperature by higher temperature than the black and silver ones.However,there was little difference during overwintering.There was little difference in onion seedlings height,stem diameter and fresh weight of organs between these treatments,except those figures of the control were lower during overwintering.The onion seedlings covered with transparent plastic film returned to green earlier and grew more vigorously than the silver and black ones in next spring.But in May the high soil temperature induced by transparent plastic film restrained the plant growth.Then onion covered with silver plastic film grew better than the transparent one,but onion covered with transparent plastic film grew better than the black one.But the three treatments still grew greatly better than the control.During harvest,the yield of onion mulched with silver,transparent and black plastic film was 84 400，77 400,and 70 600 kg·hm^-2,and higher than the control by 158.9 %,137.4 % and 116.6 %,respectively.