An investigation on nutritional status of hazelnut ( Corylus Avellana L. ) grown in acid soils of Turkey.

The aim of this study was to determine the nutritional problems of hazelnut ( Corylus avellana L. ) grown in acid soils. For this purpose, soil and leaf samples were taken from 30 different hazelnut growing areas from Trabzon Region. Some physical and chemical properties and some nutrient element contents of soil and leaf samples were determined. The determined values were compared with the critical values and degree of sufficiency were evaluated. According to the results, organic matter, total N, available P, exchangeable K and Mg contents of soil samples were sufficiently high, but Ca deficiency was observed in 93.4% of samples, because of the acid property of the soils. Available Fe, Cu and Mn contents of the soils were sufficient. In 70% of the soils, Zn deficiency was observed, whereas N, P, K, Ca, Mg and Zn deficiency of leaf samples was found in the leaf samples up to 20.0%; 26.7%; 6.7%; 73.4%; 50.0% and 66.7%, respectively. Fe, Cu and Mn contents of leaf samples were in sufficiency range. [ABSTRACT FROM AUTHOR]