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Volume :27 Issue : 2 2000      Add To Cart                                                                    Download

Acid phosphatase activity in Saudi Arabian soils

Auther : ABDULLAH M. AL-FALIH

Department of Science (Biology), Teachers College in Riyadh, P.O. Box 4341, Riyadh 11491, Saudi Arabia.

 ABSTRACT

Since little is known about the activity of acid phosphatase in Saudi Arabian soils and no studies have been previously published comparing the activity of acid phosphatase enzyme at different regions of the Kingdom of Saudi Arabia, a laboratory study was conducted to determine the acid phosphatase activity in soil from eight localities of Saudi Arabia. The effect of phosphorus fertilizer application on phosphatase activity and related properties of calcareous soils in Saudi Arabia was also investigated. Phosphorus fertilizer (100 mg P/kg soil) was solubilized to available phosphate in all soils tested. The soils from the eight localities differed in their acid phosphatase activity according to varying soil characteristics. The maximum activity of phosphatase enzyme was recorded in Alkharj (125 ىg p-nitrophenol/g/h) and Riyadh (107 ىg p-nitrophenol/g/h) soils. These sites also exhibited the largest concentration of available phosphorus. In contrast, the Hail and Qassium soils showed a slight phosphatase activity (30 and 33 ىg p-nitrophenol/g/h, respectively). The addition of phosphorus fertilizer to soils led to a tenfold increase in the concentration of available phosphorus and microbial numbers. Also, an insignificant decline in soil pH was observed after supplementation of soils with phosphorus fertilizer.

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