Browsing by Author "Sensoy, S"

Now showing 1 - 6 of 6

Effects of Humic Acid Doses and Aplication Times on the Plant Growth, Nutrient and Heavy Metal Contents of Lettuce Grown on Sewage Sludge-Applied Soils
(Parlar Scientific Publications (p S P), 2006) Tüfenkçi, S; Türkmen, Ö; Sönmez, F; Erdinç, Ç; Sensoy, S
Effects of increasing doses of humic acid (HA), applied in different periods, on the plant growth, nutrient and heavy metal contents of lettuce grown on sewage sludge-applied soils were investigated. A constant dose of 20% sewage sludge (SS) was added to experimental soil placed in pots. Various doses of HA (0, 500, 1000, and 2000 mg kg(-1)) were applied to the pots for different time periods (0, 30, 60, and 90 days before seedling transplantation). Increasing doses of HA significantly affected the plant and neck diameter, the plant height, the number of leaves, but not the plant weight. Application times of HA significantly influenced all plant growth parameters mentioned above. Moreover, there were significant effects of the interaction of HA dose and application time on the diameters, heights, and weights of lettuce plants. There were significant effects of increasing doses of HA on the N, P, K, Ca, Mg, Fe, Zn, and Cd contents of lettuce plants. Their Cd, Cr, and Co contents decreased with increasing HA doses. Also, significant differences in N, P, K; Mn, Cd, and Ni contents could be observed for various application times of HA. Moreover, the Mn content of lettuce was affected by the time and dose interaction. As a result, the application of HA had positive impacts on the plant growth and nutrient contents of lettuce, and increasing doses of HA reduced the heavy metal contents, such as Cd, Cr, and Co, in lettuce plants. The early application of HA for lettuce, with a short growing period, had more beneficial effects for the plant growth and nutrient content.
Inheritance of Tolerance To Leaf Iron Deficiency Chlorosis in Tomato
(Springer, 2004) Dasgan, HY; Abak, K; Cakmak, I; Römheld, V; Sensoy, S
By using two tomato genotypes, "227/1" (Fe chlorosis susceptible) and "Roza" (Fe chlorosis tolerant), and their reciprocal F-1, F-2 and BC1 generations, the inheritance of tolerance to leaf Fe deficiency chlorosis of Roza was studied. Plants were grown in a nutrient solution and subjected to 2.0 x 10(-6) M Fe EDDHA and 10 mM NaHCO3 to induce Fe deficiency stress by stabilization of pH to 7.8-8.2. A rating scale of 1-3 for chlorophyll was used and both monogenic and polygenic inheritance hypotheses were tested. Better responses to Fe deficiency, as measured by SPAD meter values, were obtained from the cross "Roza x 227/1" than from the reciprocal cross. Data from F-2 and BC1 suggest Fe chlorosis tolerance of Roza is to be controlled by polygenic loci with a relatively high additive effect.
Irrigation Frequency and Amount Affect Yield Components of Summer Squash (Cucurbita Pepo L.)
(Elsevier Science Bv, 2004) Ertek, A; Sensoy, S; Küçükyumuk, C; Gedik, I
The aim of this study carried out in Van, Turkey was to determine the most suitable irrigation frequencies and quantities in summer squash (Cucurbita pepo L. cv. Sakiz) grown under field conditions. Irrigation quantities were based on pan evaporation (E-pan) from a screened class-A pan. Irrigation treatments consisted of two irrigation intervals (11: 5 days; 12: 10 days), and three pan coefficients (K(cp)1: 0.45; K(cp)2: 0.65 and K(cp)3: 0.85). Plants were adequately watered from seed sowing to first fruit emergence, then, scheduled irrigations were initiated at 5- and 10-day intervals. Irrigation quantities applied to the treatments varied from 279 to 475 mm; seasonal plant water consumption or evapotranspiration (&) of irrigation treatments varied from 336 to 539 mm; and the summer squash yield varied from 22.4 to 44.7 t ha(-1). The highest total yield was obtained from I1K(cp)3 treatment. However, K,2 treatments had the earliest yield. Treatments irrigated with higher amount of water generally gave lower irrigation water use efficiency (IWUE) values than others. E-l/E-pan ratios of treatments ranged from 0.12 to 1.16. Moreover, irrigation treatments had significant effects (P < 0.01) on yield and there were significant positive linear relations among irrigation water, plant water consumption, fruit traits and yield. In conclusion, K(cp)3 treatment with 5-day irrigation interval is recommended for summer squash grown under field conditions in order to get higher summer squash yield. However, if the irrigation water is scarce, it will be suitable to irrigate summer squash frequently using K(cp)1 values. (C) 2004 Elsevier B.V. All rights reserved.
Irrigation Scheduling Based on Pan Evaporation Values for Cucumber (Cucumis Sativus L.) Grown Under Field Conditions
(Elsevier Science Bv, 2006) Ertek, A; Sensoy, S; Gedik, I; Küçükyumuk, C
This study was conducted to determine the most suitable irrigation frequency and quantity in cucumber grown under field conditions. The amount of water used was based on pan evaporation from a screened Class-A pan. Irrigation treatments consisted of two irrigation intervals (I1: 4 and 12: 8 day), and three plant-pan coefficients (K(cp)1: 0.50; K(cp)2: 0.75 and K(cp)3: 1.00). Plants were first watered at the transplanting date and scheduled irrigations were initiated after 4- and 8-day intervals. Irrigation quantities applied to the treatments varied from 320 to 509 mm; seasonal plant water comsumption or evapotranspiration of irrigation treatments varied from 391 to 597 mm; and the cuccumber yield varied from 17.99 to 45.20 ton ha(-1). The highest total yield was obtained from I2K(cp)3 treatment. Moreover, K(cp)3 treatments had the highest early yield. E1/Epan ratio according to treatments ranged from 0.29 to 1.25. Irrigation treatments had significant effects (P < 0.01) on yield and there were significant positive linear relations (P < 0.01) between the fruit number and irrigation water and between the plant water compsumption and the yield. In conclusion, K-cp3 treatment with 8-day-irrigation interval is recommended for cucumber grown under field conditions in order to get higher cucumber yield and to save time and labor. Furthermore, the E-1/E-pan equation of the best irrigation treatment (I2K(cp3)) of this study (E-t = 1.05E(pan) + 96.72) should, therefore, be used in the scheduling irrigation programs in similar conditions. (c) 2005 Elsevier B.V. All rights reserved.
Reactions of Melon Landraces Grown in the Lake Van Basin To the Physiologic Races (Race 1 and Race 2) of Fusarium Oxysporum F. Sp Melonis
(Eugen Ulmer Gmbh Co, 2006) Demir, S; Turkmen, Ö; Sensoy, S; Akköprü, A; Erdinç, Ç; Yildiz, M; Kabay, T
Disease incidence and varietal reactions of 51 melon landraces collected from Lake Van Basin, one of the secondary gene center of melon, to the physiologic races (the race I and the race 2) of Fusarium oxysporum f. sp. melonis (F.o.m.) were determined by artificial inoculations. The study was carried out in a growth chamber and pathogen isolates of the races were incubated in a medium containing corn meal and sand, and then this inoculation source was mixed with a seedling growth medium at the rate of 5% (final density: 10(6) conidia ml(-1)). Melon seedlings were evaluated with a 0-3 scale four weeks after the seed sowing in order to detect disease incidence. Disease incidence in melon genotypes against the race 1 and race 2 of F.o.m. ranged between 23% and 100% and between 7% and 100%, respectively. Moreover, F.o.m. races 1 and 2 did not form any disease incidence in four and one melon genotypes, respectively. One of the melon genotypes, 65 ERC 03, was found to be resistant to both races.
Sewage Sludge as a Substitute for Mineral Fertilization of Spinach (Spinacia Oleraceae L.) at Two Growing Periods
(Taylor & Francis As, 2004) Türkmen, Ö; Sensoy, S; Dursun, A; Turan, M