Effect of delayed sowing on root growth and development characteristics and yield in cotton
[Objective]This research aim s to study the effects of delayed sowing on cotton root growth and development characteristics and yield,so as to provide a basis for the timely sowing of cotton in the cotton planting area of the Yellow River Basin.[Methods]A field experiment was carried out at Weixian Experimental Station of Hebei Agricultural University from 2022 to 2023.Two treatments were set as conventional sowing date(15 April)and delayed sowing date(1 May).And the effects of delayed sowing on the root distribution,root growth rate,root-shoot ratio,dry matter accumulation,and yield of a cotton variety Jinongda 23 were analyzed.[Results]Compared with the conventional sowing date,under the delayed sowing condition,the maximum growth rate of cotton root length and root biomass increased by 2.92-5.35 cm·d-1 and 0.40-0.76 mg·d-1,respectively.The proportion of cotton roots in deep soil increased,with root length and biomass in the 30-60 cm soil layer increased by 2.99-3.55 percentage points and 3.94-4.42 percentage points,respectively.There was no obvious difference in aboveground biomass and root-shoot ratio in the late growth stage of cotton.The boll capacity of root system significantly decreased by 6.43%-17.69%.There was no significant difference in seed cotton yield in 2022.In 2023,the number of bolls per unit area and seed cotton yield increased significantly by 9.72%and 7.66%,respectively.Correlation analysis showed that root length density in 0-60 cm soil layer,root biomass density in 0-60 cm soil layer,maximum growth rate of root length,and the proportion of root length in 30-60 cm soil layer are extremely significantly correlated with seed cotton yield.[Conclusion]Delaying the sowing date(1 May)in cotton planting area of the Yellow River Basin can enhance the absorption function of cotton roots by increasing the growth rate of roots,the proportion of root length and biomass in deep soil layers,so as to ensure the accumulation of aboveground dry matter and promote the high yield of cotton.
国家科技期刊平台
NSTL
万方数据
