Browsing by Author "Ongun, AR"

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    Organic cucumber growing in the greenhouse
    Tüzel, Y; Gül, A; Karacanci, A; Anac, D; Okur, B; Ongun, AR; Yoldas, Z; Madanlar, N; Gumus, M; Tüzel, IH; Engindeniz, S
    This study was conducted in order to elucidate the problems in organic greenhouse cucumber growing. Two dosages of farmyard manure (15 or 30 tons ha(-1)) were tested during autumn and spring seasons of 2003 and 2004. Fruit samples were analyzed for their quality parameters (color and total dry matter content of fruits and total soluble solids, EC and pH of fruit juice) at three weeks intervals during the harvest period. Generally, there were no significant differences with respect to fruit properties between manure dosages in both growing seasons. Higher yield was in the farmyard manure application of 15 ton ha(-1) (5.92 kg/m(2)) compared to the application of 30 ton ha(-1) (3.95 kg/m(2)) in autumn season, whereas higher total yield (17.84 kg/m(2)) was obtained from the plants grown by the application of 30 ton ha(-1) farmyard manure in spring, but the difference between treatments was not statistically significant.
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    Evaluation of soil and plant health associated with successive three-year sewage sludge field applications under semi-arid biodegradation condition
    Kayikcioglu, HH; Yener, H; Ongun, AR; Okur, B
    In order to assess the suitability of sludge application for maize (Zea mays L.) soil ecosystems, this study aimed to evaluate soil microbial properties over three consecutive years using treated municipal sewage sludge (TSS) amendment in the Typic Xerofluvent Mediterranean soils of Turkey. Soil microbial properties and biochemical activities significantly increased with increasing TSS amounts. Microbial biomass carbon peaked following amendment with 30 Mg ha(-1) a(-1) of TSS, while basal soil respiration was not significantly affected by TSS doses. Moreover, soil enzyme activity increased significantly with increasing TSS amounts. A significant increase in the grain yield of 7% and 9% was found with 10 and 20 Mg TSS ha(-1) a(-1) applications respectively, whereas a significant decrease of 5% was found with 30 Mg TSS ha(-1) a(-1). Our results suggest that if the goal is to achieve plant yield in the short-term, it seems that TSS application of 20 Mg ha(-1) a(-1) can be recommended as organic fertilizer without causing potential risks. On the other hand, if the primary aim is to ensure the sustainability of the soil organic matter, the use of TSS as organic soil conditioner at a rate of 30 Mg ha(-1) a(-1) can be recommended.