Effects of minjingu phosphate rock and triple super phosphate

  • C Z Mkangwa


Comparative studies on applications of Minjingu Phosphate Rock (MPR) and triple super phosphate (TSP) as P sources were conducted in acidic soils of Hombolo and Gairo located in semi-arid lands of central Tanzania. The objectives were to evaluate the  ossibilities of using MPR as a direct P source and to assess its residual effects on groundnut and maize grain yields. The experiments were conducted using a Randomised Complete Block Design replicated 4 times for 5 and 6 seasons for maize and groundnut, respectively. In the groundnut experiment 6 P treatments were compared. These included TSP applied at 6.6 kg P/ha, MPR applied at 6.6, 13.2, 26.4 and 52.8 kg P/ha and 0 kg P/ha as the control. TSP was used as a standard P fertiliser. For the maize experiment, the treatments were MPR or TSP at 13.2, 26.4, 39.6 and 52.8 kg P/ha, 2 combinations of MPR and TSP (13.2:13.2 and 26.4:13.2) and 0 kg P/ha as the control. The studies indicated that under adequate rainfall conditions, effectiveness of MPR and TSP were similar for groundnut and maize. Under such conditions MPR can be applied as a direct P source to groundnut and maize and its residual effects can be expected in the 2nd season after application.

How to Cite
Mkangwa, C. (2008). Effects of minjingu phosphate rock and triple super phosphate. East African Agricultural and Forestry Journal, 69(1&2), 9. Retrieved from https://www.kalro.org/www.eaafj.or.ke/index.php/path/article/view/51