Effect of Landuse in the Evaluation of Activity of Nitrifying Bacteria and Viability of some types of Fungi in the Dissolving Phosphate Compounds during different Cropping Periods at AL- Mishkhab Region

Habib Mutlak  AL- Ezerjawi, Nihad

	Effect of Landuse in the Evaluation of Activity of Nitrifying Bacteria and Viability of some types of Fungi in the Dissolving Phosphate Compounds during different Cropping Periods at AL- Mishkhab Region
Euphrates Journal of Agriculture Science
Article 1, Volume 3, Issue 0, 2011, Pages 63-73
Author
Nihad Habib Mutlak AL- Ezerjawi
Abstract
Abstract : This study was conducted at Al-Mishkhab region – Al-Najaf AL- Ashraf governorate, in the rice research station, which included four land uses, , the first was a research station of rice, and the second represents the soil of a farm cropped with Mongbean, and the third site was a soil planted with date palm and fruit, and the fourth location was un cropped soils (Fallow), soil samples were collected from these sites for the chemical , physical and biological analysis. The main aim of this study was to evaluate the effect of landuse on some chemical,physical and biological properties of the soil under land uses in addition to evaluate the activity of nitrifying bacteria (Nitrosomonas and Nitrobacter) during the different Cropping periods and the ability of some species of fungi in the dissolving phosphate compounds during the different periods of cropping. Rice soils have ahighly activity for the nitrifying bacteria Nitrosomonas and Nitrobacter at the three periods of the study in compared to of other land uses, that reached 5.57, 3.39 colony forming unit. gm -1 respectively in the surface horizon soils of rice , whilst the fallow soils were poor in its nitrifying activity ,it has reached 1.13, 0.80 colony forming unit. gm -1 respectively. Studying soils were contained much of the phosphate-dissolving fungi, as Aspergillus niger, Trichoderma harzianum which isolated from Rice soils were the most efficient in the dissolving the phosphates on the Martin media ,its halo diameter reached 4.2,4 mm respectively , while the Aspergillus niger and Trichoderma harzianum which isolated from Mongbean soils achieved significant increase in dissolved phosphate, as the halo diameter were reached 4.5, 4.3 mm respectively, also the results showed that the best period of incubation, which verify abest efficiency of the fungus in the phosphate dissolving, was 120 hours.

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