Geographic distribution of different forms of phosphorous in soils of Soumeh- sara city.
2009
Mahmud Soltani, Shahram | Kavusi, Mas`ud | Davatgar,Naser | Darigh Goftar,Farahnaz
Long-term effects of Rice (Oryza Sativa L.) cultivation with different management on soil p fraction are important to understanding from soil nutritional and environment point of view.Soil P fraction gives an idea about the soil supplying capacity to plants. This experiment was conducted to evaluate different soil P fractionation under paddy fileds condition and their relation with soil properties at rice root depth (0-30 cm).Soil samples were collected from 103 paddy fields at Some-e-sara city in Guilan provience with grids of 2x2 km.Soils were analyzed to determine of their characters (pH, CEC, T.N.V, Clay, O.C) and sequentialy extracted to determine organic and inorganic P fractions.The results showed total phosphorus concentration with range of 218- 1677.5 (mean of 563),inorganic phosphorus with range of 60- 1427.5(mean of 353 mg/kgsoil) and organic phosphorus with range of 25- 525 (mean of 210 were determined.The persent of inorganic phosphorus were observed 62.6% of total phosphorus in comparison of organic phosphorus,37.4%. Inorganic phosphorus fractionations in study area were Ca_p (mean=226),Al-p(mean=15.63),Fe-p(mean=220.4) and soluble and weak bounded phosphorus(Sol-p)(mean=0.655 mg/kg soil), whereas the available phosphorus with mean of 29.02 mg/kg soil was more than Iranian paddy fields critical level.The Ca-p with pH,TNV, and OC% ,Fe-p with pH,TNV,OC%,Clay content and CEC , Al-p with OC% and CEC ,Sol-p with OC% , organic phosphorus with CEC,OC%,pH ,TNV and Clay content available phosphorus with CEC ,TNV and OC% showed significant correlation respectively. The linear multiple regression equations the available phosphorus was affected from Al-p more than other fractions in rice fields.
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