Evaluation of Phosphorus Status of Thrace Region Soils and Suitability of Different Chemical Methods Used to Determine Plant Available Soil Phosphorus of These Soils

1 Department of Soil Science, Faculty of Agriculture, Namik Kemal University, 59030-Tekirdag, Turkey
2 Department of Environmental Engineering,Dokuz Eylul University, Kaynaklar Campus, 35160, Buca-Izmir, Turkey
3 Department of Agricultural Economics, Faculty of Agriculture, Namik Kemal University, 59030-Tekirdag/Turkey


BELLITURK, Korkmaz, Fatma DANISMAN, Nazli BALDAN PAKDIL and Fuat YILMAZ, 2007. Evaluation of phosphorus status of Thrace region soils and suitability of different chemical methods used to determine plant available soil phosphorus of these soils. Bulg. J. Agric. Sci., 13: 489-497

The purpose of this research is to determine the phosphorus amount of soils of Tekirdag province that have different chemical and physical properties according to the Neubauer method which is selected as a biological method and to select the method which gives highest relationship from the 3 different chemical extraction methods for determining the available phosphorus amount. For this purpose 26 samples of soil are collected from 0-20 cm's depth in Tekirdag.
The greenhouse study has been performed in accordance to the Neubauer seedling method and coincidence pattern with 3 repetitions. The rye (Secale cerale L.) has been selected as the test plant.
In order to determine the most suitable chemical method as related to dried matter yield, phosphorus content and total phosphorus uptake of the test plant has been taken as the biological (standard) criterion.
No relationship has been found between any of the chemical extraction methods and dry matter yield of rye plant in this study.
According to the research results, significant relationships have been found only with the water soluble phosphorus method and phosphorus content and total phosphorus uptake of the test plant (respectively r= 0.374*, r= 0.342*).

Key words: Neubauer method, rye, phosphorus, extraction method

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