| In order to explore the effects of sowing pattern and planting density on root growth and yield of winter wheat,Xindong 22 was used as the material,and a two-factor split-plot experimental design was adopted. The main plot was sowing pattern at two levels:drill sowing(DR) and uniform sowing(UN),four planting density levels were set up as subplot:1.5×106,2.25×106,3.00×106,and 3.75×106 seeds·hm-2,designated as D150,D225,D300,and D375. The effects of sowing pattern and planting density on root morphological characteristics,root system flux activity,and yield of winter wheat were studied. The results showed that with the increase of planting density,the total root dry weight and total root length of wheat increased first and then decreased,but the secondary roots per plant and root system flux activity decreased. Compared with drill sowing,the total root dry weight and total root length of wheat significantly increased under uniform sowing,and the difference was mainly in 0-30 cm soil layer; the secondary roots per plant and root system flux activity increased,and the difference was mainly at the middle and late growth stages; the yield was significantly increased by 9.89%,with D225 treatment being the largest,and the difference was significant. In conclusion,the uniform sowing pattern promoted the growth of wheat roots,improved the activity of roots,resulting in higher grain yield. Under the conditions of this study,the suitable planting density was 2.25×106 seeds·hm-2. |
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