EFFECT OF SOIL STERILIZATION ON PHOSPHORUS AVAILABILITY AND pH OF DIFFERENT SOIL TEXTURES

Danha Ylda, Bahja

	EFFECT OF SOIL STERILIZATION ON PHOSPHORUS AVAILABILITY AND pH OF DIFFERENT SOIL TEXTURES
The Iraqi Journal of Agricultural Science
Article 1, Volume 42, Issue 5, 2011, Pages 99-105
Author
Bahja Danha Ylda
Abstract
To evaluate using sterilized soils as treatment within other treatments in agriculture experiments and/or using of sterilized soil as control treatments in biological experiments and to know about changes happened to the soil materials according to the soil type and soil characteristics under study due to sterilization process which take place on these soils which used in biological studies used microorganisms as ( bacteria , fungi , mycorrhiza ) as inoculants added to the soil . The experiment was conducted to study the effect of soil sterilization on 121 centigrade , and pressure 1.2kg/cm2 lasted for 20 minutes , on soil phosphorous availability and soil pH . For surface ( 0- 30) cm depth and subsurface (30 – 60) cm of four different sites in soil present land use , vegetation and surface soil texture . The obtained results showed an increase of soil phosphorus availability , and soil pH in Sterile surface soils comparative with unsterilized surface soils .The results also indicated to a decrease 0.05 level in soil phosphorus availability of 3 subsurface sterilized soil sites from the 4 sites used in the study . And a high differences in depression 0.05 level in soils pH for interaction between soil type or site and sterilization and also between all three factors which is : soil site , depth and sterilization according to previously mentioned sterilized procedure .

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