Browsing by Author "Demirer T."

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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
    (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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    Determination of the nutrition standard of soil and leaf analysis of Bozcaada Çavusu grape variety grown in Çanakkale, Turkey
    (Chemical Publishing Co., 2007) Demirer T.; Müftüoglu N.M.; Dardeniz A.; Örs T.
    Present study was carried out to determine the nutritional standard of Bozcaada Çavusu grape varieties, grown in Çanakkale. It was studied on the leaf blade and petiole samples, obtained from 20 vineyards on berry set stage and chosen on the soil samples, taken from 0 to 30 cm and 30 to 60 cm depth. There is no problem with pH, texture, exchangeable calcium, potassium, zinc and copper. Organic matter in all soil samples, phosphorus in 11.1 %, iron in 75 %, manganese in 50 % is inadequate. Nitrogen found was not enough in all leaf petiole sample units 60 % of leaf blade, phosphorus was found not enough in 40 % of leaf blade and in 67 % of leaf petioles. Calcium was also found at enough level in 95 % of leaf blade and in all of leaf petiole samples. The magnesium determined was not enough level in all leaf blade and 70 % of leaf petiole samples. The important negative and positive correlation, at 1 and 5 % levels, were obtained between the content of nutrient elements of soil characteristics and leaf blade and leaf petiole, according to the soil depth. On the other side, the important negative and positive correlation, at 1 and 5 % levels, were determined between the content of nutrient elements of leaf blades and leaf petioles.
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    Effect of leonardite application on leaf nutrient content and fruit chemical parameters of cherry (Prunus avium L.)
    (Taylor and Francis Inc., 2019) Demirer T.
    Organic fertilizers have an important role in plant nutrition practices by protecting the environment, human health, ecological balance and supporting sustainable productivity. Hence, the use of leonardite which has high humic acid content is becoming increasingly common. Objectives of the study were to examine the effects of leonardite application on leaf nutrient contents and some fruit chemical parameters (pH, total soluble solids, total phenolic content and antioxidant activity) of cherry (Prunus avium L.). Cherry Ziraat 900 was used as a test plant and grafted on a Gisela 6 rootstock. The research was carried out in a randomized block design with three replications and 12 parcels. The 10-year-old orchard was chosen as the research area with having planting space of 5.0 m × 2.5 m. Each parcel consists of 25 trees. Four different doses (0-2-4-8 kg tree−1) were applied to drip lines of trees at a depth of 20 cm. Chemical fertilizers (N-P-K) were also added. The effect of the applications in the research has a statistically significant effect on all parameters analyzed in leaves and fruits except for Mg in leaves. In addition, as the dose of leonardite is increased, its effect was also increased and the results appeared in different groups due to the increase of ionization, mobility and adsorption of chemical fertilizers applied in the research. Nutrient absorption was increased because of the increased permeability of stem cell membrane by leonardite applications. Consequently, nutrient levels in the leaves were sufficient and/or excessive and fruit contents were found optimum. © 2019, © 2019 Taylor & Francis Group, LLC.