Potasyum uygulamasının tuz stresindeki arpanın fotosentetik pigment içeriği, ozmotik potansiyel, $K^+/NA^+$ oranı ile bitki büyümesindeki etkileri

Bu saksı çalışmasında, Tokak 157/37 arpa çeşidinde (Hordeum vulgare L.) potasyum uygulamasının $(K_2SO_4)$ tuzlu ve tuzsuz koşullarda etkilerinin belirlenmesi amaçlanmıştır. Saksılarda 4 farklı (0, 200, 400, ve 600 mg K $kg^{-1}$ saksı) potasyum dozu, tuzlu ve tuzsuz ortamlarda uygulanmıştır. Denemede tuzluluk düzeyi 8 mmhos cm- olarak belirlenmiştir. Tuz stresi şartlarında Tokak 157/37 arpa çeşidinin toprak altı ve toprak üstü kuru ağırlıkları, ozmotik potansiyeli, fotosentetik pigment içerikleri ve $K^+/NA^+$ oranında tuzsuz şartlara göre kıyaslandığında azalma belirlenmiştir. Toprağa uygulanan potasyumun Tokak 157/37 çeşidinin toprak altı ve üstü kuru ağırlıklarını, ozmotik potansiyeli, fotosentetik pigment içeriklerini ve $K^+/NA^+$ oranlarını arttırmıştır. Potasyum uygulaması bitki gelişimini önemli derecede etkileyerek tuzun negatif etkisini azaltmıştır.

Effects of potassium application on photosynthetic pigments, osmotic potential, $K^+/NA^+$ ratio and plant growth of barley under salinity

A greenhouse pot experiment was conducted to study the influence of potassium rates on cultivar of barley (Hordeum vulgare, L. Cv Tokak 157/37) under salt stres and normal conditions. Potassium $(K_2SO_4)$ were added to soil at four levels (0, 200, 400, 600 mg K $kg^{-1}$) under nonsaline and saline conditions. Soil salinity used in the experiment with salinity concentrations at 8 mmhos cm-1. NaCl affected adversely barley seedlings and significantly decreased dry shoot and root weights, leaf potassium to sodium ratio and osmotic potential, and photosynthetic pigments, compared to nonsalinity condition. Potassium applications significantly affected on dry shoot and dry root weights, osmotic potantial, leaf potassium to sodium ratio, and photosynthetic pigment contents in Tokak 157/37 variety. In the present study potassium application had positive effects on salinity and alleviated negative effects of salinity on barley seedling.

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