Effects Of Sowing Date And Density On Yield Fromulation And Quality

Sowing date and planting density as two factors in wheat production can not be ignored,and play an important role in the wheat production.In this experiment,the suitable sowing date of wheat variety 1108 was studied in the Guanzhong central region?Sanyuan County,Shaanxi Province?and in the Guanzhong western region?Qishan County,Shaanxi Province?.The seeding density of sowing date was tested D saturation optimal test design,for the farmers 1108 in the production of large-scale demonstration to lay a theoretical basis.These results showed that the seeding density of sowing stage affected the wheat population structure by affecting the plant height and flag leaf net photosynthetic rate o,and finally affected the wheat yield.The main research results are as follows:?1?The sowing date of Qishan and Sanyuan had a great influence on the plant height of1108 plants,and the effect of sowing date on plant height was greater than that of seedling height.With the postponement of the sowing date,the plant height will show a decreasing trend.The different sowing rate in Qishan had a significant effect on the plant height o,but the different sowing rate of Ziyuan had a significant effect on the plant height of 1108 plants.In the case of postponement of sowing date and increasing sowing rate,the 1108 plant height But the change of plant height was small under the same sowing date.?2?The sowing date and sowing rate had a significant effect on the photosynthetic rate of flag leaf.The effects of two sowing dates on the net photosynthetic rate of flag leaf were higher than that of sowing.Under the high sowing rate,both of them showed early sowing,and the net photosynthetic rate of flag leaf could be improved obviously.With the increase of the sowing rate,the net photosynthetic rate of the flag leaf of 1108 was also increased.?3?The seeding time of Qishan and Sanyuan was October 5,and the seed yield was165kg·hm^-2.The yield of wheat was increased with the sowing date,the seeding density decreased and the yield decreased gradually.The early seeding and high seeding density of wheat were beneficial to increase the number of wheat population and could promote the wheat yield.The sowing density of sowing date had a great effect on the panicle number,which showed that the seedling height could be increased with the early sowing and high seeding density.The effect of seed germination on the number of grains per panicle in Qishan County was different,and the three principles were affected by the postponement of sowing time and the decrease of seeding rate.Fewer grains per spike.The seedling density thousand grain weight of Nongda was also changed greatly,especially in Qishan.At low seeding rate,the seeding rate was thousand.When the seeding density is high,the later the planting time is,the smaller the seed weight Grain weight in early sowing with the increase in seeding volume becomes smaller.After the sowing time is pushed,the kernels of Nongda reduced with the increase of seeding density.Two factors 95%confidence interval sowing date x₁coding value range of-0.278⁰.419,sowing x₂ coding value range of-0.394⁰.348,The yield of the target was 6500kg·hm^-28600kg·hm^-2 in the Guanzhong western region?Qishan?,and the sowing date was from October 11 to 17,And the yield of the 1108target was 8100kg·hm^-29900kg·hm^-2in the Guanzhong central region?Sanyuan?,and the sowing date was from October 11 to 17,And the sowing rate was 225×10⁶·hm^-2281×10⁶·hm^-2.?4?There were no significant differences in the grain quality indexes of seedling treatments in Qishan Experimental Area,and there were significant differences between the three primary test points and the grain weight and stability time in Sanyuan Experimental Area.Effect,with the sowing period of the delay,the increase in sowing capacity,agricultural capacity increased.While the stability time of Nongda 1108 is longer with the delay of sowing date and the decrease of sowing rate.