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    A study to determine fertility status in the Canakkale-Lapseki agricultural areas, Turkey
    (Academic Press Ltd Elsevier Science Ltd, 2003) Demirer, T; Kaleli, S; Kuzucu, CÖ
    This research was conducted on the high-quality agricultural land between the towns of Lapseki and Umurbey in the Canakkale region of Turkey, where total agricultural land covers 353,589ha. Soil samples, representing a total area of 66 10 ha, where mostly cherry, peach, sour cherry, kiwi and vegetables are grown, were taken within the depths of 0-30 and 30-60 cm. Soil samples were collected from 123 different points in the sampled area. Two samples were taken at every point, making a total of 246 soil samples, which were analysed to determine their physical and chemical properties. The results show the productivity characteristics of these agricultural soils. The results indicate that the soils are highly calcareous, with high pH, low levels of organic matter and phosphorous, and very rich in potassium. The sampled soils are deficient in zinc and iron (approximately 70% of the samples), manganese (50-55% of the samples), but have an excess copper content (approximately 95% of the samples). (C) 2003 Elsevier Science Ltd.
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    Effect of different types and doses of nitrogen fertilizers on yield and quality characteristics of mushrooms (Agaricus bisporus (Lange) Sing) cultivated on wheat straw compost
    (Kassel Univ Press Gmbh, 2005) Demirer, T; Röck-Okuyucu, B; Özer, I
    The most important prerequisite for a successful mushroom production is a high-quality compost substrate. For the present study wheat straw was used as bulk ingredient for the compost substrate preparation. In order to improve the C/N ratio and to accelerate the composting process, all substrate formulas need the addition of nitrogen-rich supplements at the outset of composting. Besides organic nitrogen sources, inorganic nitrogen supplements are also applied, when high-carbohydrate bulk ingredients are used. In the present work four different nitrogen fertilizers (urea (46 % N), ammonium nitrate (33.5 % N), calcium ammonium nitrate (26 % N) and ammonium sulfate (21 % N)) in three doses were applied as nitrogen sources and the effect on yield and some quality characteristics (cap weight, stalk weight, cap diameter, stalk diameter and stalk length) was investigated. The fertilizer application had only an unimportant effect on the cape diameter, which is an important characteristic for the classification of mushrooms, but had a stronger effect on the stalk length, which is also important for the classification. The highest dose of calcium ammonium nitrate produced the significant highest yield at the same time this variant also resulted in good results regarding the investigated quality characteristics.
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    Nutritional problems of Cardinal grapes grown in Canakkale, Turkey
    (Pakistan Botanical Soc, 2004) Müftüoglu, NM; Demirer, T; Dardeniz, A
    The purpose of this study was to determine the nutritional status of the Cardinal grapes that are grown in Canakkale. Leaf and soil samples were taken from 18 different vineyards to ensure a uniform sampling area. Although all of the soil samples contained suitable pH values for grapes, levels of organic matter content were found to be low. Lime (CaCO3) content was at an insufficient level in 72% of the soils at 0-30 cm depth and in 61% of the soils at 30-60 cm depth. Phosphorous (P) content was at low and medium levels in 94% of the soils. Potassium (K) was found to be insufficient in 50% of the soils. In both depths, the iron (Fe) content of 33% of soils was lower than the critical level. Manganese (Mn) content was at an insufficient level in 22% of the soils. There were no nutritional problems with respect to zinc (Zn) and copper (Cu) in the soils. Nitrogen (N), calcium (Ca), phosphorous (P), iron (Fe) and copper (Cu) contents of leaf blades were higher than those of leaf petioles. Potassium (K), magnesium (Mg) and manganese (Mn) contents of leaf petioles were higher than those of leaf blades. There were no differences between zinc (Zn) contents in leaf blades and leaf petioles. The N content of 89% of the leaf blades and P content of 61% of the leaf blades was higher than the critical level. There were no nutritional problems with respect to K in leaf blades. The Ca contents of leaf blades and leaf petioles were found to be at insufficient levels. The Mg contents of leaf blades and leaf petioles were found to be sufficient. There were no nutritional problems in leaf blades and leaf petioles with respect to Fe, Mn, Zn and Cu.