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    Different irrigation methods and water stress effects on potato yield and yield components
    (Elsevier Science Bv, 2005) Onder, S; Caliskan, ME; Onder, D; Caliskan, S
    This research was conducted during the spring seasons of 2000 and 2002 in Hatay province located in the East Mediterranean Region of Turkey. The research investigated the effects of two drip irrigation methods and four different water stress levels on potato yield and yield components. The surface drip (SD) and subsurface drip (SSD) irrigation methods were used. The levels were full irrigation (I-100), 66% of full irrigation (I-66), 33% of full irrigation (I-33) and un-irrigated (I-0) treatments. Five and three irrigation were applied in 2000 and 2002 early potato growing seasons, respectively. Total irrigation amount changed from 102 to 302 mm and from 88 to 268 mm in 2000 and 2002, respectively. Seasonal evapotranspiration changed between 226 and 473 mm and 166 and 391 mm in 2000 and 2002, respectively. SD and SSD irrigation methods did not result in a significant difference on yield. However, SD method has more advantages than SSD method, which has difficulties in replacement and higher system cost. Irrigation levels resulted in significant difference in both years on yield and its components. Water stress significantly affected the yield and yield parameters of early potato production. Water deficiency more than 33% of the irrigation requirement could not be suggested. Water use efficiency (WUE) of SD irrigation methods had generally higher values than SSD irrigation methods. Treatment I-33 gave maximum irrigation water use efficiency (IWUE) for both years. SSD irrigation method did not provide significant advantage on yield and WUE, compared to SD irrigation in early potato production under experimental conditions. Therefore, the SD irrigation method would be recommended in early potato production under Mediterranean conditions. (c) 2004 Elsevier B.V. All rights reserved.
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    Effect of farmyard manure and mineral fertilization on growth and yield of early potato (Solanum tuberosum) under the Mediterranean conditions in Turkey
    (Indian Soc Agronomy, 2004) Caliskan, ME; Kilic, S; Gunel, E; Mert, M
    A field experiment was conducted during the winter and spring months of 2000 and 2001 at Hatay, Turkey (36degrees 39. N, 36degrees 40' E), to study the effects of farmyard manure (0, 10, 20, 30, 40 and 50 tonnes/ha) and mineral fertilization (no or 200-90-90 kg/ha N-P-K respectively) on growth and yield of early potato (Solanum tuberosum L.) crop. Mineral fertilization significantly increased values of morphological traits and tuber yield, while it had negative effect on dry matter content of tuber. The application of farmyard manure also had positive effects on growth and yield with or without mineral fertilization. The farmyard manure also increased the efficiency of mineral fertilization. Tuber yield increased as the farmyard manure levels increased under non-mineral fertilized conditions while no significant increase obtained from 40 and 50 tonnes manure/ha rates in mineral-fertilized plots. Aplication of farmyard manure significantly increased the dry-matter content of tuber and this was more evident in mineral fertilized plots.
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    Öğe
    Effect of sowing dates on phenological development, yield and oil content of sunflower (Helianthus annuus) in a Mediterranean-type environment
    (Indian Soc Agronomy, 2002) Caliskan, ME; Gungel, E; Cagar, A; Mert, M
    The effect of sowing time on phenological development, seed yield and oil content of sunflower (Helianthus annuus L.) was studied under the restricted irrigation conditions in Hatay, Turkey (36degrees 39' N, 36degrees 40' E) in 1998 and 1999. Sunflower cultivars ('C 207' and 'Istranca') were sown at 2-week intervals from 1 March to 15 July, with 2 supplemental irrigations. Delaying in sowing shortened the period for emergence, head initiation, and total duration. Seed yield increased until 1 April and then decreased greatly with further delay in sowing both cultivars. The higher oil contents were also recorded with earlier-sown sunflower crop.