Rock phosphate-potassium and rock-solubilising bacteria as alternative, sustainable fertilizers.

摘要

Classical soluble fertilizers create environmental and economic problems. As an alternative, the effects of direct applications of rock phosphate and potassium rock along with phosphate- and potassium-solubilizing bacteria on the growth and yield of hot pepper (Capsicum annuum) were determined in an experiment conducted in Korea Republic in 2001-02. Application of rock P and K along with inoculation of P- and K-solubilizing bacteria increased P availability from 12 to 21% and K availability from 13 to 15% in the soil compared to the control. The treatment subsequently improved the N, P and K uptake of the plant. This integration also increased plant photosynthesis by 16% and leaf area by 35% compared to control plants. Biomass harvest and fruit yield of the treated plants were 23 and 30%, respectively, higher compared to the control. Overall, treatment with P and K rocks and PK-solubilizing bacterial strains and the treatment with classical, soluble fertilizer had similar effectiveness. Therefore, direct application of P and K rocks and solubilizing bacteria is a promising, sustainable alternative to the use of classical fertilizers..