Study On Sowing Time And Cold Tolerance Of Five New Wheat Varieties

In order to determine the suitable sowing time and quantity of five new wheat varieties in Yangling,the experiment is to provide theoretical guidance and scientific basis for the high-yield cultivation and demonstration promotion of these new varieties.The results are as follows:1.Three horizontal sowing densities and three sowing dates were set up by using the two factor random block method of sowing density and sowing date,The test shows that:(1)The effect of sowing date and amount on Yield and yield components was significant.With the delay of sowing date,the yield of Xiaoyan 269,Xiaoyan 68,Xiaoyan 58 and Xiaoyan 23 decreased.Among them,the early sowing of Xiaoyan 269 with low sowing rate can ensure high yield,and the delay of sowing time needs to improve the sowing rate to maintain high yield.The early sowing yield of Xiaoyan 68 was higher than that of other sowing dates.The high yield of Xiaoyan 58 can also be achieved under the condition of delayed sowing date and low sowing rate.To postpone the sowing date of Xiaoyan 23,it is necessary to increase the sowing amount and increase the yield.(2)Considering the effect of sowing date and quantity on wheat,Xiaoyan 269 and Xiaoyan 68 are suitable for sowing on October 1,with the basic seedlings of 12-24 million per mu..The basic seedlings of Xiaoyan 58 and Xiaoyan 23 were 12 million per mu and 18 million per mu.Xiaoyan 18 is suitable for sowing on October 17.(3)The plant height of wheat decreased with the delay of sowing date,and the correlation between sowing amount and plant height was low.2.Through field trials on the sowing time of five new varieties,the SOD,POD,and CAT activities of different sowing dates of three varieties of different planting density leaves and D2 sowing rate of each variety during wintering period were measured to determine the cold tolerance of each variety Sex and cold tolerance indicators show:(1)The cold tolerance of all varieties increased first and then decreased with the delay of the sowing period.The sowing period was the strongest in the cold resistance on November 1,and it was not as good as the wheat on October 1 and October 17 Ability,after the cold-tolerant exercise,there is little difference between the varieties.(2)If the sowing time is the same,the cold tolerance of varieties will be reduced if the sowing amount is too high.To sum up,when the sowing date of all varieties is October 17,the cold tolerance of medium sowing amount is stronger than that of large sowing amount.