EFFECT OF APPLICATION OF RICE STRAW COMPOST AND BIO-FERTILIZER ON P AVAILABILITY IN CALCAREOUS SOILS: 2- IMPROVEMENT OF P UPTAKE AND P- Q/I PARAMETERS BY INORGANIC P FERTILIZATION IN HIGH CaCO3 CALCAREOUS SOIL | ||||
| Arab Universities Journal of Agricultural Sciences | ||||
| Article 26, Volume 16, Issue 2, September 2008, Page 523-535 PDF (316.79 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ajs.2008.15045 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Manal M. Mohamed* ; H.E. Abu-Hussin; A.S. Ismail | ||||
| Soils Department, Faculty of Agriculture, Ain Shams University, Shobra El-Kheime Cairo, Egypt | ||||
| Abstract | ||||
| Effect of inorganic P fertilization on the re-sponse of barely growth and P uptake as well as different parameters expressing P availability in-cluding those of P- quantity- intensity relation ship was evaluated for a high CaCO3 content calcare-ous soil (31 %) subjected to application of 0, 2 and 4 % mature rice straw compost with and without inoculation with Bacillus megatherium, the phos-phate dissolving bacteria (PDB). Measurements of plant growth and P uptake as well as evaluation of Olsen-P and P- Q / I parameters in the cultivated soil were followed up at 3, 6 and 9 weeks from cultivation. Obtained results indicated a significant positive action for P fertilization in increasing the significant activation of growth and P status in grown barley plants resulted from application of used rice straw compost and /or bio-fertilizer. Inor-ganic P fertilization also increased values of the different parameters describing P availability in the concerned soil and alleviated significantly the de-pressive action of high existence of CaCO3 in P availability. This is true if the response was regard-ed to P fertilization or to the activating the roles of the application of both rice straw compost and used bio fertilizer. Equations calculated for re-gression of P uptake by different plant parts over the different parameters of P availability in the tested soil and as responded to P fertilization showed that the parameter of P capacity (Q0) is more suitable, if compared to Olsen-P and other kinetic parameters such as equilibrium P potential (EPP) and P buffering capacity (PBC) and its sen-sitivity increased with inorganic P fertilization to this calcareous soil having high CaCO3 content (31 %). | ||||
| Keywords | ||||
| P fertilization; Calcareous soil; rice straw compost; Bio-fertilizer; P uptake; P availabil-ity; P- Q/I; P buffering capacity | ||||
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