Farklı özelliklerdeki topraklarda redoks potansiyelindeki değişimlerin Fe ve Mn yarayışlılığına etkisi

Kış ayları boyunca toprakların hemen hemen doygun şartlarda kalması redoks potansiyelini düşürmekte bu da örnekleme zamanına bağlı olarak topraklarda farklı yarayışlı element konsantrasyonlarına neden olmaktadır. Topraklara giren oksijen miktarına bağlı olarak redoks reaksiyonlarında meydana gelen değişimler demir (Fe) ve mangan (Mn) yarayışlılığını önemli ölçüde değiştirmektedir. Bu nedenle bu çalışmada indirgen koşulların süresine bağlı olarak topraklardaki yarayışlı Fe ve Mn miktarlarının nasıl değiştiği incelenmiştir. Bu amaçla özellikleri farklı 15 yüzey toprağı (0-30 cm) 1:1 toprak su karışımıyla sağlanan indirgen şartlarda sabit sıcaklıkta (22±2 °C) 91 gün inkübasyona bırakılmıştır. İnkübasyonun 3, 7, 14, 21, 31, 45, 60, 91. günlerinde pH, ORP, DTPA-Fe ve DTPA-Mn analizleri yapılmıştır. Sonuçlar redoks potansiyelinin DTPA ile ekstrakte edilebilen yarayışlı Fe ve Mn konsantrasyonunu önemli ölçüde etkileyerek değiştirdiği gözlemlenmiştir. Bu değişim, inkübasyon süresine ve toprak özelliklerine bağlı olarak farklılıklar göstermiştir. Sonuç olarak topraklarda yarayışlı Fe ve Mn konsantrasyonu belirlenirken toprakların rutin analizleri içerisine ORP parametresinin de ilave edilmesinin aynı arazinin farklı dönemlerindeki analiz sonuçlarının karşılaştırılmasında faydalı olacağı düşünülmektedir.

Anahtar Kelimeler:

Toprak özellikleri, İndirgen şartlar, Yarayışlı Fe, Yarayışlı Mn, Redoks potansiyeli

Effect of redox potential induced changes on Fe and Mn availability in soils with differing characteristics

The water content near saturation during the winter times reduces the redox potential of soils this in fact cause changes in nutrient element concentration induced by sampling time. The availability of iron (Fe) and manganese (Mn) prone to very large variations depending on redox induced reactions upon depletion of oxygen diffusion into soils. Thus we aimed to investigate how available Fe and Mn concentrations are affected by saturation-time and soil properties. For this purpose total of 15 surface soil samples (0-30 cm) with differing physico-chemical properties were incubated at near saturation condition by mixing 1:1 soil: water and constant temperature (22±2°C) for 91 days. pH, oxidation reduction potential (ORP), DTPA-Fe and–Mn were measured on 3, 7, 14, 21, 31, 45, 60 and 91st days. Results indicated that redox potential had significant effects on DTPA extractable Fe and Mn concentrations. These changes were function of soil properties and incubation period. It can therefore be concluded that it is beneficial to include the ORP measurement into routine soil analyses parameters to better evaluate the available Fe and Mn concentration of the same field’s soil sampled at differing time or season.

Keywords:

Available Fe, Soil properties, Reducing conditions, Available Mn, Redox potential,

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