Effects of Na2WO4 on carbon and nitrogen metabolism at mature stage, nitrate content and tobacco quality of flue-cured tobacco leaves
The field experiment was conducted to study the effects of Na2WO4 with different concentrations on the activities of carbon and nitrogen metabolism, the contents of nitrate and nitrite, and chemical composition of leaves in overgrown tobacco after topping. The results showed that the invertase activity showed a trend of decreasing at first and then slightly higher, and the activity of amylase showed the trend of decrease firstly, then rise, and then decrease slightly under Na2WO4 treatments. The enzyme activities of the control leaves were al-ways significantly lower than those of the treated tobacco. The activity of nitrate reductase increased firstly and then decreased, and the activity of nitrate reductase in tobacco plants treated with Na2WO4 was significantly de-creased. This suggested that spaying Na2WO4 on overgrown tobacco after topping, to a certain extent, weakened the nitrogen metabolism of tobacco plants, sustainable utilization of nitrogen decreased after topping, and pro-mote ripening. The treatments of 0.5 and 1.0 mmol·L-1 Na2WO4 could significantly reduce the content of nitrate in flue-cured tobacco leaves, and spaying 1.0 and 1.5 mmol·L-1 Na2WO4 could significantly reduce the content of nitrite. On the whole, the effect of Na2WO4 on the upper leaves was greater than that on the middle leaves. The decrease rate of nitrite and nitrate in the upper leaves were 31.73% and 20.23% respectively, under the treatment of 1.0 mmol·L-1 Na2WO4. Application of Na2WO4 increased the potassium content, decreased chlo-rine and nicotine contents in flue-cured tobacco, and coordinated the chemical components of tobacco leaves. Generally speaking, the effect of spraying 1.0 mmol·L-1 Na2WO4 was better.
Na2WO4flue-cured tobaccocarbon and nitrogen metabolismnitratenitritetobacco leaf quality
NETL
NSTL
万方数据
维普
