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    A Study on Determining the Ideal Stock Density of Freshwater Crayfish (Pontastacus leptodactylus) in Polyculture with Rice (Oryza sativa L.)
    (Kahramanmaras Sutcu Imam Univ Rektorlugu, 2019) Berber, Selcuk; Kale, Semih; Bulut, Musa; Izci, Bahri
    This paper aims to determine optimum stock density for rice-crayfish rearing in controlled environment. Juvenile freshwater crayfish (Pontastams ieptodady/us) obtained in the laboratory condition from female freshwater crayfish were stocked into rice planted artificial pond at different stock densit ies (25 individuals m(-2), 50 individuals m(-2), and 100 individuals m(-2)) for the assessment of paddy field areas in terms of field fisheries in Turkey. Results showed that the best survival rate (72%) and growth for juvenile freshwater crayfish in point of length and weight has been observed at the stock density of 25 individuals m(-2). In addition, statistically significant difference has been found between this stock density and the other stock densities (p<0.05). The maximum survival rate was observed as 72% at the stock density of 25 individuals m(-2). The results of this study are significantly different when compared with Other feeding researches on juvenile freshwater crayfish in Turkey. The stock density of 25 individuals m(-2) should be applied to gain maximum yield in rice- crayfish rearing experiments suggested as an alternative met hod for crayfish rearing. This paper. the first study on the investigation of different stock density for rice-crayfish rearing, will shed light on the further researches.
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    Öğe
    DETERMINATION OF THE EFFECTS OF HYDROGEL ON IRRIGATION PROGRAM FOR MAIZE CULTIVATED IN THE FIELD CONDITIONS
    (Univ Agricultural Sciences & Veterinary Medicine Bucharest, 2016) Tekiner, Murat; Yildirim, Murat; Turkmen, Cafer; Oral, Ayhan; Izci, Bahri
    The experiment was carried out at the research center of Canakkale Onsekiz Mart University in Turkey in summer of 2010 and 2011 to determine the effects of hydrogel (organic polymer) on the grain yield and plant development parameters. Maize DKC 5783, a commonly used variety by farmers in Turkey, was used as an indicator plant and the seeds were sowed to different lysimeters having a volume of 1 m(3). The chemical properties of hydrogel and its water holding capacity were determined under laboratory conditions. According to the treatments, certain amounts of hydrogel were mixed to the first 20 cm of the soil from the surface level. Irrigation water was applied in a controlled manner by a scaled container to the root area of maize. Plant development parameters were observed in each development stage. As a result of this study, it was seen that the amount of hydrogel mixed to the soil in different amounts had a significant effect on the plant development parameters, grain yield and also irrigation water use efficiency.