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An Investigation on Nutritional Problems of Hazelnut Grown on Acid Soils

Abstract The purpose of the study was to determine the nutritional problems of hazelnut (Corylus avellana L.) grown on acid soils. For this purpose, soil and leaf samples were taken from 30 different hazelnut growing areas from Trabzon Region in Turkey. Some physical and chemical properties and some nutrient element contents of soil and leaf samples were determined. These determined values were compared with critical values, and the degree of sufficiency was evaluated. In general, organic matter, total nitrogen (N), available phosphorus (P), exchangeable potassium (K), and magnesium (Mg) contents of soil samples were sufficient. Calcium (Ca) deficiency was obtained in 93.4% of the soil, because of acid property of the soils. Available iron (Fe), copper (Cu), and manganese (Mn) contents of the soils were found to be sufficient. In 70% of the soils, Zn deficiency was found. Nitrogen, P, K, Ca, Mg, and Zn deficiencies of leaf samples were 20.0, 26.7, 6.7, 73.4, 50.0, and 66.7%, respectively. Iron, Cu, and Mn contents of leaf samples were found to be sufficient.