At the mean time, D fertilizer particle microcapsules were made with higher content of K but median content of N to meet the demands of tobacco plant at middle and later stage and promote maturity.

The K-Factor correlated linearly with dust concentration, this is due to the variation of dust particle median diameter.

The aboveground standing crop was significantly positively correlated with total K, total P and quantity of fine particle at the level of P<0.05;