Abstract:

The absorption ways of the three major elements of NPK and the changes of the weather during the growth period of early flowering flue-cured tobacco were studied. The results showed that: the flue-cured tobacco was insensitive to short-day treatment, the short-day treatment couldn’t brought forward the growing season; the low temperature after transplanted below 15℃ was the main reason of early flowering, the lower the temperature was, the earlier the flowering came; the sharp declines of nitrogen content and phosphorus content in leaves was a sign of flowering stage; the three major elements of NPK came into the rapid accumulation after topping, so the application of available nitrogen in order to ensure the normal development of leaf was necessary.