Effects of exogenous potassium fertilizer on carbon and nitrogen accumulation and its enhancement of chilling tolerance in tobacco seedlings

doi:10.14088/j.cnki.issn0439-8114.2025.07.007

Abstract

Abstract: In order to explore the effect of exogenous potassium fertilizer on the resistance of flue-cured tobacco to chilling stress, the effects of spraying 0.1% potassium dihydrogen phosphate (T1) and 0.1% potassium fulvic acid (T2) on the growth and development, carbon and nitrogen content and antioxidant enzyme system of tobacco were studied by indoor and field experiments. The results showed that compared to the control (CK, foliar spray with distilled water), the shoot dry weight of T1 and T2 increased significantly by 65.8% and 27.2%, respectively. The root dry weight of T1 and T2 increased significantly by 133.3% and 72.2% compared to the control, respectively. The total carbon content of T1 and T2 increased significantly by 17.4% and 20.2% compared to the control, respectively. The soluble sugar content and soluble protein content of T1 increased significantly by 26.4% and 41.5% compared to the control, respectively. Compared to the control, the catalase activity of T1 and T2 increased significantly by 76.2% and 38.3%, respectively, and the total antioxidant capacity increased significantly by 250.2% and 40.8%, respectively. The comprehensive evaluation results of the membership function method showed that the comprehensive low temperature resistance of T1 was the best. It was recommended to spray 0.1% potassium dihydrogen phosphate during the tobacco transplanting period and the period of late spring frosts to improve cold resistance of tobacco to low response.

Key words: tobacco, seedlings, exogenous potassium, carbon and nitrogen accumulation, chilling stress, chilling tolerance, physiological response

CLC Number:

CHEN Tao, LI Guo-lan, FU Hui-jie, ZHU Song-fa, SONG Wen-jing, ZHANG Ya-li, YU Ke-ke. Effects of exogenous potassium fertilizer on carbon and nitrogen accumulation and its enhancement of chilling tolerance in tobacco seedlings[J]. HUBEI AGRICULTURAL SCIENCES, 2025, 64(7): 36-39.

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