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Articles by Tekin Kara
Total Records ( 5 ) for Tekin Kara
  Tekin Kara and Imanverdi Ekberli
  The objectives of this study were to develop an equation and derive equation for different boundary conditions of sprinkler irrigation drop falling and to stop runoff from soil surface. Irrigation scheduling is the process related to when, how much water to apply to a soil. The irrigation method concerns how that desired water depth is applied to the field. The uniformity of water distribution depends on an irrigated field and efficiency of on-farm water application. Conclusions point out on the laterals must install parallel to field slope contours for controlling runoff, erosion and on-farm water application.
  Tekin Kara and Lyman S. Willardson
  The purpose of this study was to develop a model to quantify the rate of upward water movement from a shallow water table for different soils with and without plants as a function of water table depth and time, to predict Electrical Conductivity (EC) of the soil in a one-dimensional homogenous soil profile and to develop a water management procedure to control soil profile salinity in the presence of a shallow water table. The model simulates water and solute movement from a shallow water table for a bare soil surface. Salt distribution in the soil profile, caused by a saline shallow water table, was simulated by assuming a steady state upward water movement in the absence of a crop. As water moves upward through a soil profile from a shallow water table, the water evaporates at the surface, leaving the salt behind. Some of the salt moves down to a depth about 30 cm by molecular diffusion. This raises the salt concentration within the top 30 cm of the soil. The model also simulates crop water extraction patterns and consequently the salt distribution patterns in an irrigated soil profile for a specified root distribution. After a fallow season and the resulting salt concentration near the soil surface, the salt redistributes downward because of irrigation water application. Different leaching fractions were used in the simulations. A computer program, for the model SALTCTRL (Salt Control), was written in QBASIC language. The program was tested for two soils for different leaching fractions. The soil parameters needed for the computations were selected from the literature. Application of model results is discussed and recommendations for further research were made.
  Tekin Kara and Cigdem Biber

A field experiment was conducted during summer season of 2005 at the Research Station (altitude 180 m above sea level, 41o21` N and 36o15`E) Faculty of Agriculture, Ondokuz Mayis University, Samsun, Turkey. Experiment consisted of three irrigation levels and a non-irrigation level. Drip irrigation treatments consisted of three soil water deficits in the 90 cm soil profile depth was replenished to field capacity. Irrigation treatments were A: no irrigation, B: irrigation at 50% of available soil water capacity, C: irrigation at 30% of available soil water capacity, D: irrigation at 15% of available soil water capacity. The average seasonal water use values ranged from 257.14 to 285.71 mm in corn treatments. Irrigation frequencies (intervals) significantly affected corn crop yields. The average corn grain yields varied from 7.98 to 29.16 t ha-1. The treatment D was recorded significantly higher corn grain yield 29.16 t ha-1 compared to B (21.59 t ha-1); C (19.15 t ha-1) and A (7.98 t ha-1), respectively. According to research results, the maximum corn grain yield was obtained when the corn plants were irrigated at 15% of available soil water capacity to field capacity.

  Tekin Kara , Emine Ekmekci and Mehmet Apan

The basic aim of the sprinkler irrigation method, as in other irrigation methods, is to apply irrigation water as uniformly as possible to the root zone. The uniform distribution of the applied water in sprinkler irrigation depends on factors such as sprinkler type, number and size of nozzles, arrangement of sprinklers, working pressure and the speed and direction of the wind. Sprinkler and lateral spacing should be determined by also taking the speed and direction of the wind into consideration. The aim of this study was to determine the application limits and the curves of water distribution under different working pressures, spatial arrangement and nozzle diameters under field conditions of some irrigation sprinklers which are widely used in Turkey. The objective was to determine the most appropriate system arrangement by using a computer program called CATCH3D. Five sprinklers were tested in the experimental area of Ondokuz Mayis University Campus and their water distribution characteristics identified. The most suitable operating parameters for Bereket 3: 12x18 m, Bereket 2: 12x18 m, Egeyildiz 6x18 m, Goktepe 6x12 m and for Atesler sprinkler 12x18 m arrangement type were determined.

  Tekin Kara , Kadir Ersin Temizel and Mehmet Apan

In this study, some of the empirical methods such as USDA-SCS and volume balance equations were used for determining furrow length. The main purpose was proving empirical equations application possibility. According to results, USDA-SCS and Volume Balance Equations can be used for determining furrow length at the Bafra Plain, Turkey. The field experiment and Volume Balance results are very close to each other. Experimental results are different from USDA-SCS equation results, but there is a relationship between both. There is a coefficient between field results and USDA-SCS equation result for furrow length. The coefficient (0.41) can multiply by UDSA-SCS result is 73 m which is very close to the field experimental result of 71 m.

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