Abstract
Soil samples were collected from calcareous soil fertilized with phosphate fertilizers for many years from different regions of central and southern Iraq and from two depths surface 0-30 and subsurface 30-60 cm. Forms of soluble, ready available, organic and total phosphorus were extracted. Through statistical analysis of different phosphorus forms with soil composition of the studied soils, there was a positive and significant correlation between ready phosphorus, OM and active and total calcium carbonate. The simple correlation coefficient (r = 0.495) and active calcium carbonate (r = 0.539) were weak and significant. (r = 0.292) since calcium carbonate has to do with the adsorption of phosphorus and the formation of metals more stable and stable and less ready readiness Also there was a significant correlation (P <0.05) between organic phosphorus and cation exchange capacity and the simple correlation coefficient (r = 0.426).
Highlights
Phosphorus is an essential component of plant growth, so maintaining a sufficient amount of phosphorus in soil is extremely important for the purpose of sustaining different crop cultivation systems, especially the strategy ones
A part of the phosphorus may be associated with the organic matter through the calcium ions prevalent in calcareous soils, and this relationship is not a causal relationship
As the effectiveness of carbonate minerals depends on the surface area and the active calcium carbonate is the most effective part of the lactate and precipitation of phosphorus in Iraqi limestone soils (Al-Qaisi, 1999)
Summary
Phosphorus is an essential component of plant growth, so maintaining a sufficient amount of phosphorus in soil is extremely important for the purpose of sustaining different crop cultivation systems, especially the strategy ones. This happens through the application of a fertilization program by adding organic and / or inorganic fertilizers (Sharpley et al, 1994). In most parts of soil, inorganic phosphorus is found in slightly low concentrations in soil solution when a large rate of it is strongly related to various soil minerals This is in addition to the possibility of adsorption of phosphate ions on the surfaces of various minerals such as. The target is a relationship between phosphorous and some traits (organic matter, total and active carbonates, reciprocal capacity, positive ions)
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