EVALUATE THE EFFECT OF SOME FACTORS AFFECTING SOLUBILIZATION OF PHOSPHORUS IN RHIZOSPHERE | ||||
| Arab Universities Journal of Agricultural Sciences | ||||
| Article 84, Volume 27, Issue 1, March 2019, Page 913-923 PDF (989.7 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ajs.2019.43847 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
rookaya salah el-hag 1; A. M. Elgala2; M. A.O. Elsharawy2; M. A. Eid2
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| 1soil science,agriculture faculty,Ain Shams university,cairo,egypt | ||||
| 2Soil Sci. Dept., Fac. of Agric., Ain Shams Univ., P.O. Box 68, Hadayek Shubra 11241, Cairo, Egypt | ||||
| Abstract | ||||
| The aim of this work was to conduct pot experiment to study the ability of plant roots on solubilizing various sources of phosphorus and factors that may facilitate or inhibit their activity. A split medium – split root technique experiment was conducted to study the effect of CaCO3, pH, organic matter (humic acid) and bentonite on the pH, P solubility in the medium and P concentration in bean plants (Vicia faba var. balady). The changes in pH of the lower solution was recorded, also the root exudate was collected in 500 ml of CaCl2 solution 0.5 × 10-4 M and pH 6.85. Results showed that the highest recorded total dry weight was found when both N forms were applied in the ratio of 1:4 NO-3: NH+4 or NO-3 alone. The mechanism of solubilizing rock phosphate by exudating protons or organic, amino and other organic compounds is possible at the root surface even in alkaline soil as long as the rock phosphate material was added near the root and organic matter was added to limit the fixing power of the inorganic components as CaCO3 and excess soluble Ca. Also, the availability of P from rock phosphate sources depends on its reactivity value. | ||||
| Keywords | ||||
| organic matter; Bentonite; CaCO3; pH; Rock Phosphate; rhizosphere; Split medium technique; Faba bean plants | ||||
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