Effects of Late Sowing on Premature Senescence and Yield Formation of Tartary Buckwheat under Low Nitrogen Treatment
To determine the effect of late sowing on premature senescence and yield of Tartary buckwheat under low nitrogen conditions,a variety of Tartary buckwheat with low nitrogen tolerance,'Qianku5'was selected as the experimental material.Four sowing dates were set under the nitrogenous fertilizer-free condition,including August 29(B1),September 4(B2),September 10(B3),and September 16(B4),to investigate the effect of different sowing dates on chlorophyll content,antioxidant enzyme activity and malondialdehyde content in leaves,root activity and morphology,agronomic traits and yield in different growth periods.The results demonstrated a gradual decline in content of chlorophyll a,chlorophyll b and carotenoid,a first rise and then fall in superoxide dismutase and peroxidase activities and a gradual rise in malondialdehyde content in leaves,a reduction in root morphology,plant height and root activity,and a decrease in number and weight of seeds per plant,thousand-grain weight and yield per mu,with the delaying of sowing dates.Conclusion:Late sowing would accelerate the senescence of Tartary buckwheat and decrease the yield under low nitrogen conditions.Therefore,the favorable late sowing time of Tartary buckwheat in autumn is August 29 to September 4 for Guizhou,which can provide a reference for the feasibility of triple-cropping of Tartary buckwheat in Guizhou.
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