Effect of water-potassium coupling on potassium uptake and utilization of flue-cured tobacco

doi:10.14088/j.cnki.issn0439-8114.2026.03.010

Abstract

Abstract: To make reasonable use of water and potassium resources, the Qiandongnan Miao and Dong Autonomous Prefecture of Guizhou Province was selected as a study area to explore the effects of different water-potassium coupling modes on the absorption and utilization of potassium nutrients in flue-cured tobacco. A field plot experiment was conducted with three irrigation levels (0.50, 1.00, and 2.00 L per plant) and three potassium application levels (K₂O application rates of 135, 270, and 405 kg/hm²). The effects of potassium application rate and irrigation amount on the absorption and utilization of potassium nutrients in flue-cured tobacco were investigated. The results showed that the accumulation of potassium in various organs, whole plant and stage of tobacco plants increased with the increase of the potassium application rate and irrigation amount. The absorption of potassium by different organs and its distribution proportion among organs followed the order: leaves > stems > roots. The absorption and accumulation intensity of potassium in tobacco plants were different at different growth stages, mainly concentrated in the vigorous growth period, and tobacco leaves were the main absorption and accumulation organs of potassium. The partial productivity of potassium fertilizer decreased with the increase in potassium application rate, while the potassium harvest index was better under medium-high irrigation and potassium application levels. The irrigation water use efficiency decreased with the increase in potassium application rate and irrigation amount. From the perspective of saving water and fertilizer and potassium absorption by tobacco plants, the coupling treatments of a potassium application rate of 270 kg/hm² with irrigation amounts of 1.00 L/plant or 2.00 L/plant were more conducive to enhancing the absorption and utilization of potassium by flue-cured tobacco in the study area.

Key words: irrigation amount, potassium application rate, coupling effect, flue-cured tobacco, potassium, uptake, utilization

CLC Number:

S572
S365

TANG Hong, ZENG Zhang-quan, WANG Jian-wei, LIU Lun-pei, TANG Kai-zhao, LENG Li-juan. Effect of water-potassium coupling on potassium uptake and utilization of flue-cured tobacco[J]. HUBEI AGRICULTURAL SCIENCES, 2026, 65(3): 64-71.

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