Browsing by Author "Duyar H."

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    The effects of green manuring on organic head lettuce production in greenhouse
    (International Society for Horticultural Science, 2009) Duyar H.; Tüzel Y.; Gürbüz Kilic Ö.; Anaç D.
    Green manuring has a key role in organic agriculture, because it enriches the soil organic matter and provides nutrients to soil microorganisms resulting in an increase in microbial activity. This research was carried out in order to determine the effects of summer green manuring and poultry manure application before planting, on organic head lettuce (Lactuca sativa var. capitata cv. Coolguard) production in the greenhouse. The study was realized in 2006 and 2007 in PE covered greenhouse at the Department of Horticulture, Ege University. The tested summer green manure plants were (1) soybean (Gylcine max. L. Merr.), (2) maize (Zea mays) and (3) cowpea (Vigna sinensis L.) and a plot was left as a control (4) without green manuring. Prior to planting, 7.5 t ha-1 certified poultry manure was applied to subplots and a subplot was left as control. The experimental design was split plots with three replicates where the main plots were green manuring and the subplots poultry manuring. The total yield in head lettuce production was between 4123.3 and 7430.5 g m-2. The highest yield was obtained from the maize parcel that received poultry manure. Nitrate content of the leaves was higher in the plants of green manure plots that also received poultry manure. Organic matter content of the control parcel was 1.5% at the beginning while after the green manuring it was 1.7, 1.57 and 2.25% at incorporation, 15 and 30 days after incorporation, respectively. Total soil nitrogen also increased during the incorporation.
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    Effects of some organic fertilizers and Agryl cover on yield, quality and leaf nutrient content and soil productivity in organic lettuce growing; [Organik Salata-Marul Yetiştiriciliǧinde Agryl Örtü ve Bazı Gübrelerin Verim, Kalite, Yaprak Besin Madde İçeriǧi ve Toprak Verimliliǧi Özelliklerine Etkileri]
    (Ankara University, 2011) Tüzel Y.; Öztekin G.B.; Duyar H.; Eşiyok D.; Kiliç O.G.; Anaç D.; Kayikçioǧlu H.H.
    This study was carried out at the organic land of Ege University Faculty of Agriculture, Department of Horticulture during the spring and autumn seasons. Three organic fertilizers were tested under two growing systems to determine yield, quality, plant growth and soil fertility in Romaine lettuce (cv. Yedikule) and lettuce (cv. Arapsaçi{dotless}) production. Experiments were conducted with 6 groups composed of two growing systems [under Agryl cover (A+) or open field conditions without Agryl (A-)] and three fertilizers [Biofarm (B), Biofarm + Humic Acid (BHa) and Biofarm + Leonardite (BL)] in two years and growing seasons (2005-spring and 2006-autumn) with factorial design. In both years, total yield and average plant weight increased with the use of agryl cover while among the tested fertilizers, BHa and B applications gave the highest yields in the 1st and 2nd year, respectively. Agryl cover affected plant length among the measured quality characteristics. Mean nitrate content of organic lettuces was found quite low than the limits. Effects of agryl cover and fertilizers on leaf nutrient content were significant whereas fertilizer treatments increased soil microbial biomass-C and organic matter content in the first yield. It was concluded that these treatments could be recommended to use in organic lettuce production due to the positive effects of agryl cover on yield and organic fertilizers on yield, quality and soil fertility. © Ankara Üniversitesi Ziraat Fakültesi.
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    Effects of winter green manuring on organic cucumber production in unheated greenhouse conditions
    (Turkiye Klinikleri Journal of Medical Sciences, 2013) Tüzel Y.; Duyar H.; Öztek G.B.; Gürbüz Kiliç Ö.; Anaç D.; Madanlar N.; Yoldaş Z.
    The effects of winter green manure crops on organic cucumber production were determined in unheated greenhouse conditions in order to integrate soil building and conservation practices, which are critically important in greenhouse production without crop rotation. The study was conducted between 2006 and 2008 to compare (1) pea (Pisum sativum L.), (2) Italian rye-grass (Lolium multiflorum L.), and (3) common vetch (Vicia sativa L.) as winter green manure plants. These treatments were compared with a control without green manuring (4). All of the plots were divided into halves, and poultry manure was applied as 0 (-PM) and 0.75 kg m-2 (+PM) to each. Cucumber (Cucumis sativus 'Sardes') was grown as a spring cycle production after winter green manure plants were incorporated into the soil. Treatments were evaluated in terms of yield, fruit quality parameters such as electrical conductivity, pH, titratable acidity, total soluble solids, and dry weight. Soil fertility and pest/disease incidence were also determined. It was found that cucumber yield varied between 9.7 and 16.3 kg m-2 and between 10.0 and 13.6 kg m-2 in the first and second spring growing seasons, respectively. Green manuring improved the organic matter and nitrogen contents of the soils. Other available nutrients in the soil were also analyzed and found to be sufficient. Additionally, the nutrient status of the cucumber plants was found to be sufficient. Pea and vetch proved to be efficient as winter green manure crops for vegetable production in greenhouses. Poultry manure also produced positive effects, in particular on soil total N content. Therefore, it could be used with green manure crops according to the N content of the soil. © TÜBİTAK.