II. Eurasian conference nuclear science and its application : proceedings, 16-19 September, 2002. Almaty, Kazakhstan
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Browsing II. Eurasian conference nuclear science and its application : proceedings, 16-19 September, 2002. Almaty, Kazakhstan by All Authors "Akın, Ali İbrahim"
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Item Drip irrigation and fertigation of potato under light-textured soils of Cappadocia Region(National Nuclear Center of the Republic of Kazakhstan / Institute of Nuclear Physics, 2003) Halitligil, Mahmut Basri; Onaran, Hüseyin; Munsuz, Nuri; Kışlal, Hakan; Akın, Ali İbrahim; Ünlenen, Abdullah Levent; Çaycı, Gökhan; Kütük, Cihat; TAEK-ANTHAMIn order to evaluate potato respone to drip irrigation and N fertigation; and also to improve nitrogen and water use efficiencies of potato and eventually to obtain less nitrogen polluted surface and ground water, 10 field experiments were carried out at three different locations in Cappodocia Region of Turkey in 1997, 1998, 1999 and 2000. Nitrogen as ammonium sulphate [(NH4)2So4], was supplied through drip irrigation water (fertigation) at rates of 0, 30, 60, and 90 kg N/da. Also, soil N application treatment equivalent to the fertigation treatment of 60 kg N/da was included. These five treatments were investigated in a completely randomized block design with four replications. Agria potato variety was used in all experiments and potato was planted in mid May and harvested at the end of October. 15N-labelled ammominum sulphate fertilizer were applied in isotope-sub plots within the macroplots for each treatment in order to determine the amount of nitrogen taken up by the plant, nitrogen use efficiency and the distrubution of residual nitrogen at different depths in the soil profile. Each year during the growth period 12 irrigations were done and 50 mm of water was applied at each irrigation. At harvest, plant samples (tuber and leaf+vein) and soil samples were taken and % N, % 15N atom excess (% 15N a.e.) and % Ndff determinations were done. Soil water contents at different soil depths were determined by soil moisture neutron probe at planting and at harvest so that water contents at different soil layers and water use efficiencies were calculated for each treatment. The results obtained showed that 3350 kg/da mean total marketable tuber yield was obtained with application of 600 mm irrigation water. Also, it was found that water did not move below 90 cm of soil layer in drip irrigationfertigation system, which showed clearly that no nitrogen movement occurred beyond 90 cm soil depth. Tuber yields and % Ndff increased when nitrogen is applied with drip irrigation-fertigation system in comparision to the application to the soil and then drip irrigation. At harvest, more nitrogen was accumulated at shallower depths with fertigation treatments.Item Nitrogen and water regime effects on corn yields determined by N-15 tracer technique(National Nuclear Center of the Republic of Kazakhstan / Institute of Nuclear Physics, 2003) Halitligil, Mahmut Basri; Akın, Ali İbrahim; TAEK-ANTHAMThis investigation was carried out to determine the relationships between fertilizer nitrogen leaching and N fertilizer application time, method and irrigation rate by using 15N methodology. Therefore, in the field experiments, the effects of three factors namely; a) irrigation rates (optimum 240 mm, high 360 mm), b) N application times (all at planting, 1/2 at planting and 1/2 after planting when plant heights were 50 cm), c) N application methods (sidedress and broadcast) were investigated. The field experiments were conducted using randomized block desing as split-split plot with 4 replications. As the test plant hybrid corn (TUM-82-2) was sowed on a 0.80 m row spacing and 0.25 m seed spacing. Nitrogen was applied 120 kgN/ha to the all treatments as urea fertilizer (46 % N). In addition, to the subplots (which received half of N at planting and the other half when plant heights were 50 cm) 15N labelled urea (2.63 % 15N atom excess as 120 kgN/ha) was applied. After harvesting, total N and 15N analyses were done for different plant parts and soil samples. The results showed us that the seed and total yields were increased with higher (360 mm) irrigation. When N application was sidedressed the availability of N was increased, and also its’ loss by leaching from the active root zone was decreased. In conclusion, it was observed that at high irrigation rate was saved about 84 kgN/ha by sidedressing rather than broadcasting of the applied N fertilizer.