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Öğe Crop water stress index for assessing irrigation scheduling of drip irrigated broccoli (Brassica oleracea L var italica)(Elsevier, 2010) Erdem, Yesim; Arin, Levent; Erdem, Tolga; Polat, Serdar; Deveci, Murat; Okursoy, Hakan; Gultas, Huseyin T.This study was conducted to determine the possibility of a crop water stress index (CWSI) to schedule irrigation for broccoli (Brassica oleracea L var italica) grown with drip irrigation during the spring and autumn cultivation periods of 2007 The effects of five irrigation levels which were applied based on a ratio of Class A pan evaporation (k(cp) =0 050 075 1 00 and 1 25) with 7 days Interval on broccoli yields and resulting CWSI were investigated The highest yield and water use was obtained in the treatment of applied 50% of the evaporation measured in Class A pan for two seasons while the effects of irrigation programs on yield was not statistically significant The seasonal evapotranspiration in the treatments varied from 187 to 326 mm during the spring period and from 242 to 346 mm during the autumn period The CWSI was calculated using the empirical approach from measurements of Infrared canopy temperatures ambient air temperatures and vapor pressure deficit values for five irrigation levels An average threshold CWSI value of about 051 before irrigation produced the maximum yield The yield was directly correlated with mean CWSI values and the linear equation Y= -36 51(CWSI)2 +32 958(CWSI) + 0 772 with a determination coefficient R-2 = 099 and standard deviation S-yx =1 38 Mg ha(-1) can be used for yield prediction The soil water content soil matric potential above ground biomass and leaf area Index values were also found to correlate better with CWSI as a key function for modeling the crop growth model The CWSI value was useful for evaluating crop water stress in broccoli and should be useful for timing irrigation and predicting yield (c) 2010 Elsevier BV All rights reservedÖğe IRRIGATION SCHEDULING FOR WATERMELON WITH CROP WATER STRESS INDEX (CWSI)(Univ Zagreb, Fac Agriculture, 2005) Erdem, Yesim; Erdem, Tolga; Orta, A. Halim; Okursoy, HakanThis study was designed to evaluate different threshold values of crop water stress index (CWSI) to schedule irrigation for watermelon (Citrullus vulgaris) grown with drip irrigation Irrigations were started when CWSI values reached to 0.2, 0.4, 0.6, 0.8 and 1.0 (non-irrigation). The CWSI values were computed from measurements of canopy temperature, air temperature and vapor pressure deficit. The total irrigations amount of 342, 280, 248 and 193 mm were applied to the 0.2, 0.4, 0.6 and 0.8 CWSI treatments, respectively. The maximum seasonal evapotranspiration (ET) as 412 mm was measured from 0.2 CWSI treatment. Irrigation levels significantly affected fruit yield. Although the highest fruit yield (76.3 t ha(-1)) was obtained from the 0.2 CWSI treatment, the 0.4 and 0.6 of CWSI treatments were statistically in the same letter group with this treatment. Also, maximum water use efficiency (WUE) and irrigation water use efficiency (IWUE) were obtained from 0.6 of CWSI treatment as 22.1 and 13.3 kg m(-3), respectively. Therefore, based on these results, 0.6 of CWSI value should be used for irrigation time of watermelon under Tekirdag, Turkey conditions.Öğe Water-yield relationships of potato under different irrigation methods and regimens(Univ Sao Paolo, 2006) Erdem, Tolga; Erdem, Yesim; Orta, Halim; Okursoy, HakanYield response to irrigation of different crops is of major importance in production planning where water resources are limited. This study aims to determine the effect of different irrigation methods and irrigation regimens on potato yield in the Trakya Region, Turkey, during 2003 and 2005. Potato was grown under furrow and drip irrigation methods and three regimens: irrigation applied when 30, 50, or 70% of the available water was consumed. The seasonal potato evapotranspiration ranged on 501 to 683 mm in 2003, and 464 to 647 mm in 2005. The furrow and drip irrigation methods had no significant effect on tuber yield for both years. Irrigation regimens influenced tuber yield (P < 0.05) in 2005, and the highest tuber yield was registered for 30% irrigation regimen, reaching 35.13 t ha(-1) in 2003, and 44.56 t ha(-1) in 2005. Water use efficiency values increased from 4.70 to 6.63 kg m(-3) for furrow-irrigated treatments, and from 5.19 to 9.47 kg m(-3) for drip-irrigated treatments.