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Articles by Nur OKUR
Total Records ( 2 ) for Nur OKUR
  Nur OKUR , Huseyin Husnu KAYIKCIOGLU , Bulent OKUR and Sezai DELIBACAK
  Agro-industrial waste presents an alternative to inorganic fertilizer. It is possible to use tobacco waste as a soil amendment due to its high organic matter and low toxic element content. Tobacco waste compost (TWC) and farmyard manure (FYM) were applied to Typic Xerofluvent soil at various ratios, and butter-head lettuce (Lactuca sativa L. var. Capitata L.) was grown. The effects on soil organic C and total N content, soil microbial biomass, soil respiration, activity of 4 enzymes (dehydrogenase, urease, alkaline phosphatase, and β-glucosidase), and lettuce yield were determined. Organic materials were applied at the rate of 50 t ha-1. Significantly (P < 0.05) higher values were observed for Corg, total N, soil respiration, and dehydrogenase, urease, and alkaline phosphatase activity in 25% FYM + 75% TWC and 100% TWC soils than in the control. The microbial biomass C level in the soils increased in response to all compost treatments. β-glucosidase activity values did not show statistical differences between any of the organic amendment treatments. The application of TWC and FYM resulted in a significant increase in lettuce yield when compared to the control. The results suggest that the incorporation of TWC as an alternative organic amendment might improve soil chemical and biological parameters, as well as crop yield in dryland and especially in Mediterranean soil, which are both characterized by low organic matter content.
  Nur OKUR , Ahmet ALTINDISLI , Muzaffer CENGEL , Selcuk GOCMEZ and Huseyin Husnu KAYIKCIOGLU
  Many recent studies from around the world have compared organic and conventional farming systems in terms of soil properties. Microbial biomass and enzyme activity were compared in vineyard soils managed by organic and conventional practices under Mediterranean conditions during the growing. Organic treatments were (i) green manure and farmyard manure at the rate of 30 t ha-1 (GM1), (ii) green manure and farmyard manure at the rate of 10 t ha-1, plus E2001 EM Bio-polymer gel solution (GM2), and (iii) green manure plus E2001 EM Bio-polymer gel solution (GM3). Only mineral fertilizers and pesticides were used in the conventional system (CONV). Soil organic C and soil microbial biomass C (SMBC), and protease, urease, alkaline phosphatase, and dehydrogenase activity were significantly higher in the organic system than in the conventional system. The ratio of microbial biomass C to total organic C content (Cmic/Corg) was also higher in the organic plots. Total organic C content increased in the organic system by 13%-23% in comparison to the conventional system. Application of GM1 and GM2 resulted in greater microbial biomass and activity, as compared to the other management systems. SMBC was significantly correlated with dehydrogenase, protease, urease, and alkaline phosphatase. These results indicate that organic management positively affected biochemical properties, thus improving soil quality and productivity.
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