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洋葱实行起垅覆膜栽培,可防止泥沙淤膜、淤葱,有利于提高膜内温度,促使葱苗正常生长,增产效果十分明显.据定点调查,3月上旬当日平均气温1.4℃,5cm地温为4.9℃时,洋葱即开始返青生长.3月份覆膜处理膜内月平均总积温为196.3℃,5cm地温的总积温为223.4℃,分别比不覆膜的对照处理高75.4℃、83.9℃.4月2日交接叶片的叶鞘出现并定长,4月份覆膜处理膜内气温、5cm地温又分别比对照处理高100.9℃、116.3℃.当洋葱长出1片～7片叶时,1片～4片叶鞘出现并定长,比不覆膜处理的多长3片叶;5月上、中旬覆膜处理的膜内气温和5cm地温比对照处理又分别高99.2℃、120.6℃,春生5叶～6叶定长,假茎及叶片的总生长量比对照处理大1倍以上.由于覆膜处理洋葱的生长发育提前,假茎及叶片生长量大,促进了鳞茎生长.覆膜栽培小区产量为128.0kg/13.33m~2,比不覆膜的对照增产34.3%,方差分析差异极显著(F=37.427
Onion practicing 垅 film cultivation, to prevent sediment deposition silt, will help increase the temperature inside the membrane, prompting the normal growth of onion seedlings, the yield is very obvious.According to site survey, the average daily temperature in early March 1.4 ℃, 5cm The onion began to grow back to green at a ground temperature of 4.9 ° C. The monthly average accumulated temperature of the membrane in March was 196.3 ° C. The total accumulated temperature at 5 cm was 223.4 ° C., 75.4 ° C. and 83.9 ° C. higher than the non-coated control April 2 leaf sheath emergence and fixed length, in April membrane temperature, 5cm ground temperature were respectively higher than the control treatment 100.9 ℃, 116.3 ℃ .When the onion grows 1 to 7 leaves, 1 The leaf sheath of ~ 4 leaves appeared and fixed length, which was 3 leaves longer than that of the non-covered leaf. In May, the air temperature and 5cm ground temperature in the upper and middle treatments were respectively 99.2 ℃ and 120.6 ℃ higher than those of the control 5 leaves ~ 6 leaves fixed length, the total growth of pseudostems and leaves than the control treatment more than 1 times.Due to the early growth and development of plastic coated onions, pseudostem and leaf growth, and promote bulb growth. The yield of plots was 128.0kg / 13.33m ~ 2, 34.3% more than the non-laminar control, and the variance analysis was extremely significant (F = 37.427