Toprak Organik Maddesi ile Fosfor Adsorpsiyonu Arasındaki İlişkinin Langmuir Modeli ile Araştırılması

Yıl 2017, Cilt: 6 Sayı: 2, 59 - 70, 25.09.2017

İlknur Yurdakul Sadık Usta

https://doi.org/10.21657/topraksu.339839

Cited By: 1

Öz

Fosfor (P) bitki beslenmesinde makro besin maddesi
olarak büyük bir öneme sahiptir.  Toprak fosforu bünyesinde barındıran önemli bir doğal
kaynaktır. Fosfor toprakta
az  bulunmakla  birlikte çeşitli mekanizmaların da etkisindedir. Topraktaki fosforun adsorpsiyonuna etki eden özelliklerin teşhis edilmesi, fosforun
bitki tarafından daha etkin kullanılmasına yardımcı olacak stratejilerin geliştirilmesine imkan sağlayacaktır. Bu amaçla, Ankara-Sarayköy (Düver Serisi) ve Şanlıurfa-Koruklu (Harran
Serisi) bölgesinden alınan iki farklı toprakta, toprakların fraksiyonlarında, organik madde ile P-adsorpsiyonu arasındaki ilişki çalışılmıştır. Toprakların ve fraksiyonlarının P-adsorpsiyon maksimumları, içerisinde 0-50 mg P (KH PO ) kg-1konsantrasyonları
bulunan 0.01 M CaCl2 çözeltisi ile oda sıcaklığında (25OC) 24 saat dengeye getirilmesi ve çözeltideki P’un spektrofotometre ile okunması ile elde edilmiştir. Çalışma sonucunda, P-adsorpsiyonu 124-323 mg P kg-1 arasında elde edilmiştir. Her iki toprak
ve bu toprakların fraksiyonlarına ait (Harran serisi kil fraksiyonu
hariç) Langmuir adsorpsiyon izotermlerinde yüksek bir korelasyon (p<0.01) gözlenmiştir. Langmuir izoterminden hesaplanan yükleme enerjileri k=0.42-15.67 L mg-1 P arasında
ve ayırma faktörü 1-6.33x10-16 arasında hesaplanmış ve olayın adsorpsiyon lehinde gerçekleştiğini göstermiştir. Çalışma sonuçlarına göre organik maddenin her iki toprakta adsorpsiyon bölgelerini maskeleyerek P-adsorpsiyonunu azalttığını söylemek mümkündür. Sonuçlar
ayrıca toprak mineralojisinin
P adsorpsiyonunu kontrol eden önemli bir faktör olduğunu da
göstermektedir.

Anahtar Kelimeler

Adsorpsiyon, toprak fraksiyonu, fosfor, Langmuir

Kaynakça

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