Evaluation of sorghum response to different sources and rates of phosphorus fertilizers [electronic resource].

Includes references.

Pot experiment was carried out to study the impact of different phosphatic fertilizers, sources and rates, on availability of N,P and K nutrients and some heavy metals in soil and their uptake by Sorghum plant. -0Data revealed that phosphatic fertilizers positively affected the dry matter of sorghum plant grown on clay loam soil and the response was dependent on P-fertilizer sources and rates. The results indicate that the highest values for dry matter content were obtained when (DAP) was applied at either lower or higher rates of application. Meanwhile the lowest values of plant growth were found with (SSP) fertilizers and increase with plant age. The analytical analysis of the soil samples after each cut show that, increasing rates of P-fertilization increase the availability of N P and K nutrients and Cd and Pb in the extraction solutions. Data representing the uptake of N P K and Cd or Pb metals by sorghum as affected by different applications of sources and rates of P_ fertilizers showed positive responses compared to control. Values being higher for Cd and Pb in the highest rate of (SSP) fertilizers compared to TSP and DAP fertilizers.

Summary in Arabic.

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