No abstract

The efficiency of eight organic and inorganic carries was tested from local materials they were soil, farm yard manure and their mixture at (1:1), charcoal, sludge waste, peatmose, composed sawdust and kaolounite clay mineral for carrying the becteria of Azospirrilum lipoferm and Bacilus Polymyxa which were isolated and identified from soil rhizosphere of different sites of south of Iraq, after incubate them for 180 days then with standard method the counts were determined at (30,60,90,120,150 and 180) days. The results showed that the efficient carrier was soil: farm yard manure at ratio (1:1) with the maximum no. of counts until 90 days of incubation time for both bacteria Azospirrillum and Bacillus. The next best carriers were sludge waste and farm manure only while the composed sawdusthad fewer counts so, we can say that carrier (soil: farm yard manure) as suitable for various crops and different species of bacteria.

The aim of this laboratory experiment which includes isolating of sulfur oxidizing bacteria (genus Thiobacillus) fromRhizosphere of some plants and soil treated with sulfur and contaminated with oil and choose the best isolates in reducing the degree of pH and production of sulfate .The isolate T2 is excellent  on the rest of the isolates in reducing the degree of pH (8) to (5.51 , 6.07) and produced sulfate29.1and 114.90 mg.L -1in sulfur and thiosulfate Liquid media as compared with other isolate and used as inoculum in pots experiment .The pots are filled with 4 Kg soil of Qurna Fertilizaedwith nitrogen fertilizer and potassium fertilizer as recommended maize and added the sulfur levels (0,2,4,6) tan S. Ha-1soil and rock phosphate levels (0,400,800,1600) Kg rock.Ha-1.The pots have beendivided into twoparts: one of them is inoculation with 15 ml of T2 isolate and the other is left without inoculated and incubated pots laboratory for a month and moisteur tap water to complete the process of sulfer oxidation. After the end of the incubation the pots trancfered to the wired of the college of Agriculture, University of Al-Basra and planted with seeds of maize by (6) seed .pot-1 and placed according to the design (RCBD) with three replications .After germination with 60 days took samples from the soil14 ,42and exet the experiment and  measurement of avilable phosphorus. The results showed that the treatment of best isolated T2,6 tan.ha-1 1600 Kg rock.ha-1as gived the highest concentration of available phosphorus in the soil 90.60 ,48.43 and 44.75 mg P. kg-1. soil during the two- six-week periods and after harvest as compared to the treatment without inoculation and non treatment with sulfur and rock phosphate.