A Note on the effect of phosphate rock, triple superphosphate, Bradyrhizobium and their combinations on the available soil phosphorus in Shambat clay soil
2005
Elsheikh, M.A. (University of Khartoum, Shambat (Sudan). Faculty of Agriculture. Dept. of Soil and Environment Sciences) | El Tilib, A.M. (University of Khartoum, Shambat (Sudan). Faculty of Agriculture. Dept. of Soil and Environment Sciences) | Elsheikh, E.A. (University of Khartoum, Shambat (Sudan). Faculty of Agriculture. Depr. of Soil and Environment Sciences)
A pot experiment was carried out to study the effect of phosphate rock (PR) at the rate of 0.55 and 110 kg P205/ha, triple superphosphate (TSP) at the rate of 0.45 and 90 kg P205/ha. Bradyrhizobium and their combinations on available soil phosphorus for two consecutive seasons (2000/01 and 2001/02). Another experiment was carried out to study the residual effect of the first season. The groundnut cultivar MH383 was used as a test crop. The results showed that both PR and TSP significantly (P0.05) increased available soil phosphorus with increase in their rates. Although PR alone was less effective than TSP, PR became more effective when mixed with TSP. The level of available soil phosphorus in the residual experiment was significantly (P0.05) higher than the control. Bradyrizobuim had no significant effect on the measured parameters. The results clearly demonsstrate that mixing of PR with TSP increases the effectiveness of PR, and therfore PR could be a potential source of phosphorus in Shambat clay soil, particularly when mixed with TSP. More experiments, especially field trials, should be carried out before a final recommendation could be made
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