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1986～1987年采种甜菜覆膜期的试验结果,11月20日、12月10日、3月5日覆膜均表现增产.11月20日覆膜增产效果最佳,达极显著水平;12月10日覆膜在暖冻年是可行的,遇上冷冻年则偏晚。适宜的覆膜时期能有效地控制甜菜种株开花期在
The results of the sugarbeet mulching period from 1986 to 1987 showed that the film mulching increased on November 20, December 10 and March 5. The mulching film yield was the best on November 20, reaching the extremely significant level. On the 10th of the month, the coating is feasible in the freezing year, while the frozen year is late. Appropriate coating period can effectively control the flowering period of sugarbeet species in