| 【Objective】Based on the phenomenon of potassium loss and the decrease of potassium distribution in
leaves after topping of tobacco plants, the regulation effect of fulvic acid potassium application on potassium accumulation
and absorption in the late growth period of flue-cured tobacco was studied, so as to improve the potassium nutrition of
tobacco plants and the quality of tobacco production.【Method】With the flue-cured tobacco variety “K326” as tested
material, the effect of fulvic acid potassium on the dry matter accumulation, the potassium content and its accumulation,
and the yield and quality of primary flue-cured tobacco leaves were studied by field experiment.【Result】The application
of fulvic acid potassium could promote the growth of tobacco plants and the absorption of potassium. Compared with the
control, when the application amounts of fulvic acid potassium were 75, 150 and 225 kg/hm2 during topping, the dry matter
accumulation and potassium accumulation increased 9.7%, 20.44%, 16.44% and 27.62%, 38.12%,38.12%, respectively,
while the yield and output value of primary flue-cured tobacco increased 3.93%, 30.64%, 1.14% and 13.74%, 57.64%,16.86%, respectively, and the nicotine content and potassium content also increased. 【Conclusion】Fulvic acid potassium can
effectively promote the absorption of potassium, increase the dry matter accumulation and potassium content of tobacco leaves,
and improve the quality of tobacco leaves, which has a good promotion value in tobacco production. |
