EFFECT OF SOME ORGANIC AND INORGANIC COMPOUNDS ON BIOAVAILIBILITY OF PHOSPHORUS AND NITROGEN IN DIFFERENT SOILS

Abstract

The current study involved different experiments, i.e. two laboratories experiments, one pot experiment and two field experiments to explore the impact of using some organic and inorganic compounds on the bioavailability of P and N as well as, to reduce losses of both nutrients by volatilization or leaching. Results demonstrated that all of the different treatments markedly decreased nitrogen volatilization as NH3 compared to the untreated soil. The lowest loss was found by biochar + biofertilizer treatments.Whereas the application of potassium humate + biofertilizer treatment was the highest one. However, biochar + biofertilizer treatment was the most effective for reducing chemically available N-NO3 with increasing the depth up to 60 cm and this treatment was the most effective to control mobility and concentration of N-NO3 at depth 20 to 40 cm compared to the control. While, the application of biochar, zeolite+ biofertilizer or zeolite at the different rates appeared the lowest effect on the movement of NO3—ions. But, the application of potassium humate + biofertilizer at the different levels increased the mobility of P with depth compared to the control, on the other hand, potassium humate and potassium humate + biofertilizer increased the concentration of P with increasing time of experiment to 60 days then decreased with increasing the time.