Abstract:

Flue-cured tobacco seedlings were cultured in root boxes to investigate the effect of fertilization on phosphorus and potassium in the rhizospheric nutrition of flue-cured tobacco. The tobacco seedlings were supplied with chemical fertilizer, organic fertilizer and the mixture of chemical and organic fertilizers respectively. The blank treatment was established in the same way except without fertilizer supplied. The result showed organic fertilizer and the mixture of chemical seedling biomass, smoke, phosphorus, potassium uptake were higher than the contrast, were increased 1.2 times, 1.5 times and 1.7 times. Available P and K in the soil near the roots of tobacco seedlings were much higher than those far from the roots, indicating faster absorption of P and K by the seedlings than the movement toward to soils. The reasonable application became adjust flue-cured tobacco root zone phosphorus and potassium nutrition the important means. Ca-P and O-P content were stable and the potential soil phosphorus source. Organic fertilizer and the mixture of chemical raised greatly the available P in the rhizsophere of tobacco seedlings. Al-P and Fe-P in the soil near the roots were much higher than those far from the roots. It also increased obviously the activity of acid phosphatase in the rhizospheric soil, indicating organic fertilizer and the mixture of chemical increased the ability of the Al-P, Fe-P and organ phosphorus. In the production practice, advocates of coordinated chemical fertilizer and organic fertilizer to keep a steady supply of soil nutrient and improve the nutrient utilization efficiencies of P and K, promotion of the growth and development of smoke seedlings and production quality flue-cured tobacco have important significance.