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据我省毛白杨埋条育苗的资料介绍,埋条育苗的适宜季节是3月下旬,春分前后,气温在5—8℃。但通过1985—1986年试验,与资料介绍的有明显不同,适宜气温为15℃—17℃,时间在清明节后4月9日左右。 1985年,河北省林木种苗场用基灌法育毛白杨苗54亩,因停电洇地时间拖长,埋条育苗时间由3月29日开始,持续到4月9日结束。在相同圃地条件下,因埋条时间不同。生长出现明显差异,经1985年11月6日抽样调查
According to the introduction of burl nursery material in our province, the suitable season for planting nursery stock is in late March, and the temperature is about 5-8 ℃ before and after the vernal equinox. But through the 1985-1986 test, there is a clear difference from the introduction of the data. The suitable temperature is 15 ℃ -17 ℃, and the time is around April 9 after the Ching Ming Festival. In 1985, the forest seedling field in Hebei Province was populated with 54 acres of Populus tomentosa seedlings by means of basal irrigation. Due to the prolonged power outage, the time for seedling raising in buried barrels began on March 29 and lasted until April 9. In the same nursery conditions, due to the different time of entry. Significant differences in growth, the sample survey on November 6, 1985