TRAKYA BÖLGESİ TOPRAKLARININ BİTKİYE YARAYIŞLI FOSFOR DURUMUNUN BELİRLENMESİNDE DEĞİŞİK KİMYASAL EKSTRAKSİYON YÖNTEMLERİNİN KARŞILAŞTIRILMASI

Öz

Bu araştırmanın amacı; Tekirdağ iline ait farklı kimyasal ve fiziksel özelliklere sahip toprakların fosfor durumunu biyolojik yöntem olarak seçilen Neubauer fide yöntemine göre saptamak ve bu toprakların bitkiye yarayışlı fosfor miktarının belirlenmesinde 3 farklı kimyasal ekstraksiyon yöntemleri ( 1- Suda çözünebilir P, 2- Asit florürde çözünebilir P, 3- Sodyum bikarbonatta çözünebilir P) içerisinden biyolojik yöntemle en yüksek ilişkiyi verebilen yöntemi seçmektir. Bu amaçla Tekirdağ ilinden 0-20 cm derinlikte 26 adet toprak örneği alınmıştır. Sera denemesi, Neubauer fide yöntemine ve tesadüf blokları deneme desenine göre 3 tekrarlamalı olarak yürütülmüştür. Deneme bitkisi olarak çavdar (Secale cerale L.) kullanılmıştır. Deneme topraklarının yarayışlı fosfor kapsamlarını belirlemede kullanılan kimyasal yöntemlerden uygun olanının seçilmesinde biyolojik (standart) ölçüt olarak bitki P içeriği, bitki P alımı ve kuru madde üretimi temel alınmıştır. Denemede kullanılan kimyasal ekstraksiyon yöntemlerinin tümü ile çavdar bitkisinin kuru madde miktarları arasında herhangi bir ilişki bulunamamıştır. Araştırma sonuçlarına göre, sadece suda çözünebilir fosfor yöntemi ile bitki P içeriği ve bitki P alımı arasında önemli ilişkiler bulunmuştur (sırasıyla r= 0.374*, r= 0.342). Suda Çözünebilir P yönteminin Trakya Bölgesi topraklarının fosfor tayini için en uygun yöntem olduğu ortaya çıkmıştır

Anahtar Kelimeler

• Çavdar, ekstraksiyon yöntemi, Neubauer fide yöntemi, yarayışlı fosfor

A COMPARISON FOR DIFFERENT CHEMICAL EXTRACTION METHODS IN DETERMINING THE AVAILABLE PHOSPHORUS EXISTENCE FOR PLANTS AT SOILS IN THRACE

Öz

The purpose of this study is to determine the phosphorus status of soils of Tekirdag province that have different chemical and physical properties according to the Neubauer seedling method which is selected as a biological index method and to select the method which gives highest relationship from the 3 different chemical extraction methods (1- Water soluble P, 2- Soluble P in acid fluoride, 3- Soluble P in sodium bicarbonate) for determining the available phosphorus amount. For this purpose 26 samples of soil are collected from 0-20 cm depth in Tekirdag. The greenhouse study has been performed in accordance to the Neubauer seedling method and a completely randomized block desing with 3 replications. The rye (Secale cerale L.) has been selected as the test plant. In order to determine the most suitable chemical method, the dry 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). Method of P soluble in water is found to be the most appropriate method in determining the phosphor in soils of Thrace region

Anahtar Kelimeler

• Available phosphorus, extraction method, Neubauer seedling method, rye

Kaynakça

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