Abstract:

To explore sowing depth and waterlogging time after wheat sowing how to affect germination rate and seedling strong levels before winter, four different types of species have been studied under controlled conditions. Results showed that: water logging for 1-4 days after sowing can led to the average germination rate of five different sowing depths of TN18 decreased by 22.43%, winter dry matter decreased by 21.56%; JM20 decreased by 23.43% and 18.46%; SN8355 decreased by 9.66% and 19.86%; LM14 decreased by 6.21% and 23.20%; the effects of waterlogging on TN18 and JM20 are significantly lower than that on the SN8355 and LM14. Waterlogging can reduce 3cm soil temperature by 0.47℃, 5cm soil temperature by 1.15℃.. when the waterlogging time is equal , with the increase of sowing depth, waterlogging influence germination rate and seedling quality more and more strongly ；when sowing depth is the same, with the increase of waterlogging time, the influence of waterlogging increase. when the sowing depth is in the range from 2cm to 6cm, shallow sowing can make germination rate and seedling quality higher, and reduce the effect on waterlogging, so shallow sowing is one of effective measures to treat waterlogging in waterlogging areas. However, shallow sowing makes the tillering node basically in 2cm,not conducive to resistance freezing and drought, so the results are only suitable for waterlogging areas.