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    Determination of suitable chemical extraction methods for available zinc (Zn) content in paddy soils of the Thrace Region in Turkey
    (Interperiodica, 2003) Adiloglu, A; Kursun, I
    This research was carried out in order to determine the most suitable method for chemical extraction of available zinc (Zn) content in paddy soils for plants in the Thrace Region. As a result of the investigation with 12 paddy soils representing the region, the effect of the application of increasing amounts of zinc (Zn) to the soil of pot-grown maize on increasing the zinc (Zn) uptake by the plant, amount of dry matter, and zinc (Zn) content in the plant was determined. Nine chemical extraction methods for available zinc content of soils were used, and the reliability of the investigated methods was ranked as 0.005 M DTPA + 0.01 M CaCl2 + 0.1 M TEA > 0.005 M DTPA + 1 M NH4HCO3 > 0.01 M Na-2 EDTA + 1 M (NH4CO3 > 0.01 N Na-2 EDTA + 1 N NH4 OAc > 0.01 N Na-2 EDTA > 1 N NH4OAc > 2 N MgCl2 > 0.05 N HC1 + 0.025 N H2SO4 > 0.01 M Hidrocinon. The method for extraction with a 0.005 M DTPA + 0.01 M CaCl2 + 0.1 M TEA solution, which not only has the highest correlation coefficient (r) but also enables determination of Fe, Mn, and Cu concentrations in addition to Zn amount, can be recommended as the most suitable method for the soils investigated.
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    Determination of suitable chemical extraction methods for available zinc content of paddy soils at thrace region in Turkey
    (Marcel Dekker Inc, 2003) Adiloglu, A; Kursun, I
    This research was carried out in order to determine the most suitable method for chemical extraction of available zinc (Zn) content of paddy soils. Paddy soil samples from twelve regions were collected and each sample was further divided into four pots each of which was allocated to one of the four Zn doses. Therefore a total of 45 samples were evaluated after growing maize as the test plant. It was determined that Zn uptake, dry matter amount and Zn content of the plants increased with the application of increasing Zn rates to the pots. Nine chemical extraction methods for available Zn contents of soils were used and the reliability of the investigated methods was ranked as: 0.005 M DTPA+0.01 M CaCl2+0.1 M TEA; 0.005 M DTPA+1 M NH4HCO3; 0.01 M Na-2 EDTA + 1 M (NH4)(2)CO3; 0.01 M Na-2 EDTA + 1 M NH4 OAc; 0.01 M Na-2 EDTA; 1 M NH4OAc; 1 M MgCl2; 0.05 M HCl + 0.012 M H2SO4; 0.01 M Hidrocinon. The method for extraction with 0.005 M DTPA + 0.01 M CaCl2 + 0.1 M TEA solution had the highest correlation coefficient with and also enabled the determination of iron (Fe), manganese (Mn) and copper (Cu). It could be recommended as the most suitable one for the investigated soils.
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    The effect of EDTA on the extractability of zinc (Zn), cadmium (Cd), and nickel (Ni) in vertisol and alluvial soils
    (Pleiades Publishing Inc, 2003) Adiloglu, A
    Ethylenediaminetetraacetic acid (EDTA) is persistent in the environment. The presence of EDTA in soil may alter the mobility and transport of Zn, Cd, and Ni in soils because of the formation of water soluble chelates, thus increasing the potential for metal pollution of natural waters. Mobility of metals is related to their extractability. To investigate metal extractability affected by EDTA, Zn, Cd, and Ni were added to vertisol and alluvial soils at rates of 50, 2, and 5 mg/kg, respectively. Both natural and metal amended soils were treated with Na(2)EDTA at rates of 0, 0.2, and 0.5 mg/kg. After five months of incubation, soil samples were extracted with 0.1 N HCl, 0.005 M DTPA + 0.01 M CaCl2 + 0.1 M TEA (0.005 M diethylenetriaminepentaacetic acid + 0.01 M calcium chloride + 0.1 M triethanolamine), and 1 M Mg(NO3)(2), the latter of which extracts the exchangeable form of metals (Zn, Cd, and Ni). According to experimental results, Zn, Cd, and Ni in all extractions increased with increasing rates of EDTA in the natural and metal amended soils.
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    An investigation on nutritional problems of hazelnut grown on acid soils
    (Taylor & Francis Inc, 2005) Adiloglu, A; Adiloglu, S
    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.