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    Effects of deficit irrigation treatments on yield and plant growth of young apricot trees
    (Taylor & Francis Ltd, 2015) Bozkurt, S.; Odemis, B.; Durgac, C.
    An experiment was conducted to investigate the effects of deficit irrigation on yield and tree growth of young apricot trees (Prunus armeniaca L. cv. Ninfa) during three growing seasons with three irrigation intervals (7, 14 and 21 days) and five irrigation levels based on reduction coefficients (K-cp) of class A pan evaporation (0.0, 0.25, 0.50, 0.75 and 1.00). Growth and yield variables such as trunk diameter, mean branch length, volume of tree, total number of fruit, mean fruit weight, total fruit yields of trees, evapotranspiration and water use efficiencies were determined. While the irrigation interval treatments had significant effects on trunk diameters and branch lengths of the trees, the irrigation level treatments significantly affected all the tree growth variables. Variation in irrigation level also affected yield, with yield and fruit size increasing as irrigation increased up to at least 0.75 of pan evaporation. The treatment with 25% water deficit and a 14-day irrigation interval is suggested as the most suitable irrigation strategy for young apricot trees under a Mediterranean climate.
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    Influence of different nitrogen sources and leaching practices on soil chemical properties under tomato vegetation in a greenhouse
    (2008) Bozkurt, Sefer; Agca, N.; Odemis, B.
    A greenhouse study was carried out to determine the effects of different nitrogen sources and leaching practices on soil chemical properties. Tomato (Lycopersicon esculentum) was used as a test plant. All plots were fertilized equally for nitrogen, phosphor and potassium whereas nitrogen was applied at five different NH4+N/NO3-N ratios (N1 = 100/0; N2 = 75/25; N3 = 50/50; N 4 = 25/75; N5 = 0/100). No nitrogen applied plots (N 0) were also added to experiment. The changes and their relationships of soil soluble ions (Ca2+, Mg2+, Na+, K +, CO32-, HCO3-, Cl -, SO42-), EC and pH were determined in soil samples taken from three soil layers (0-5, 5-15 and 15-45 cm) at the beginning and the end of the study. Soil samples were also taken before and after the soil leaching to determine the effects of leaching on the parameters mentioned above. Soil pH had different correlations with N treatments among soil layers and showed rising trends with soil depths which had statistically significant differences at p<0.05 level in all treatments. Soil leaching caused statistically significant differences on soil pH at p<0.05 level. There were increases in EC values in all N treatments over the study period. However, soil leaching decreased soil EC values in all plots. All cations were affected by all treatments and their interactions. The study showed that the chemical properties of soil especially soil pH was affected by the forms of N fertilizers. © 2008 Asian Network for Scientific Information.