This research was carried out to determine soil residual effects on stand establishment rate and yield in the rotation crops soft winter wheat (Triticum aestivum L.), barley (Hordeum vulgare L.), winter oil seed rape (WOSR) (Brassica napus L.), maize (Zea mays L.) and sugar beet (Beta vulgaris L.) following Intervix ® (33g Imazamox + 15g Imazapyr) spraying in Clearfield ® (CL) sunflower (Helianthus annuus L.) production. The experiments were conducted at the Trakya Agricultural Research Institute in Edirne between 2007 and 2009 using a randomized complete block design (stripe plots) with three replications. Five crops were evaluated in crop rotation after spraying Intervix ® on Clearfield ® sunflower. As the experiment materials, we used the sunflower hybrid Sanay-CL and the cultivars Gelibolu (soft winter wheat, SWW), Bolayir (barley), Elvis (winter oil seed rapeseed, WOSR), Brasco (maize), and Leyla (sugar beet). Nitrogen and phosphorus fertilization were applied according to soil analysis recommendations. Observations were made of the number of plants emerged per m 2 , stand establishment, yield, time to flowering, time to physiological maturity, plant height, root length, head diameter, etc., according to plants included in crop rotations. Based on statistical analysis of the data from crop rotation experiments, CL sunflower plots followed by wheat, barley, and maize were not negatively affected to a significant degree by Intervix ® residues in terms of stand establishment and seed yield in either year. In the first year of crop rotation, however, when planting WOSR four months after Intervix ® application on CL sunflower plots, stand establishment and seed yield decreased significantly, by 35.7 and 23.7%, respectively. When planting sugar beet nine months after Intervix ® application on CL sunflower plots, stand establishment and beet yield decreased by 26.7 and 11.6%, respectively. However, in the second year in the same crop rotations plots, stand establishment and yield of WOSR and * Clearfield ® and Intervix ® are registered trademarks of BASF

This research was carried out to determine the seed yield and some yield components of two dwarf hybrids as compared to one standard-height sunflower hybrid (Helianthus annuus L.) at different nitrogen rates and planting densities. The study was carried out under natural rainfed conditions at the Thrace Agricultural Research Institute in Edirne-Turkey between 1999 and 2001. The experiments were set up in split-split plots in a randomized complete block design with three replications. The main plot treatments were three different-height sunflower hybrids, DW-1, DW-2, and Trakya-80. The sub plots were three levels of nitrogen, 0, 60, and 120 kg N/ha. The sub-sub plots were three planting densities, 10 × 70 (142,850 plants/ha), 15 × 70 (95,230 plants/ ha), and 20 × 70 cm (71,430 plants/ha). Based on marginal economic analyses, the economically optimal seed yield per hectare was obtained at 50 kg N/ ha for DW-1 and at 80 kg N/ha for DW-2 and Trakya-80. In all three hybrids, increasing plant densities decreased 1000-seed weight, hull percentage, and head diameter but increased test weight in natural rainfed conditions. The highest seed yield in both dwarf hybrids was obtained with the spacing of 15 × 70 cm (95,230 plants/ha). The results of this research show that nitrogen and plant density have significant effects on seed yield and some yield components of different-height sunflower hybrids.

ÖzBu araştırma, Trakya Tarımsal Araştırma Enstitüsünde geliştirilen bazı ileri kademe kışlık kolza (Brassica napus L.) hatlarının Edirne koşullarında verim ve verim unsurlarının belirlenmesi amacıyla yapılmıştır. Denemeler, tesadüf blokları deneme desenine göre 4 tekrarlamalı olarak 2012-2013 ve 2013-2014 kışlık kolza yetiştirme dönemlerinde Edirne'de Trakya Tarımsal Araştırma Enstitüsü arazisinde yürütülmüştür. Çalışmada kışlık kolza materyali olarak dört adet ileri kademe hat ve dört adet tescilli standart çeşit (Süzer, Excalibur, Elvis, NK-Petrol) olmak üzere toplam 8 genotip kullanılmıştır. Bu araştırmada dekardan alınan tane veriminin yanında yağ oranı, yağ verimi, bin tane ağırlığı, bitki çıkış tarihi, kışa dayanma, bitki boyu, yan dal sayısı, bitkide harnup sayısı, harnupta tane sayısı, harnup çatlama %'si, tam çiçeklenme tarihi, fizyolojik olum tarihi, yatma ve hasatta tanede % nem değerleri belirlenmiştir. İki yıl süre ile Edirne koşullarında yapılan bu araştırmadan elde edilen verilerin analiz ve değerlendirme sonuçlarına göre, denemeye alınan ileri kademe hat ve çeşitler arasında dekardan alınan tane verim farkı istatistiksel açıdan %0.01 düzeyinde önemli bulunmuştur. Denemesi yapılan bu 8 ileri kademe kolza hat ve çeşidinin tam çiçeklenme tarihi 9-17 Nisan, fizyolojik olum tarihi 3-10 Haziran, bitki boyu 170-190 cm, bitkide harnup sayısı 126-164, harnupta tane sayısı 22-26, harnup çatlatma oranı %0-5, dekara tane verimi 286.0-350.3 kg/da arasında değişmiştir. Determination of Yield and Yield Components of Some Advanced Rapeseed (Brassica napus L.) Varieties in Edirne Conditions AbstractThis research was carried out to determine of yield and yield components of some advanced rapeseed (Brasicca napus L.) varieties in Trakya Agricultural Research Institute-Edirne conditions.The experiments were established in randomized complete block design with 8 varieties in four replications. The research lasted for two growing seasons from 2012 to 2014. As a material totally 8 genotypes' 4 advanced lines' TK-05-10, TK-05-12, TK-05-14, TK-05-20 and 4 certified standard varieties' Süzer, Excalibur, Elvis, NK-Petrol winter rapeseed varieties are used in the experiment. Observations and evaluations were made for grain yield/ha, seed oil content %, oil yield/ha, 1000 seed weight, full plant emerge date, cold tolerance, plant height, branch number, capsule number in per plant, seed number per capsule, capsule crack %, first flowering date, plant lodging, and percent seed moisture in harvest. According two growing season results of this research in Edirne conditions, it has been found statistically significant (0.01%) seed yield differences among advanced lines and certified varieties. Whole flowering date 9 to 17 April, physiological maturity date 3 to 10 June, plant height 170 to 190 cm, capsule number per plant 126 to 164, seed number per capsule 22-26, pods cracking 0 to 5%, and seed yield per hectare 2860 to 3503 kg were changed among eight rapeseed advanced lines and varieties.

he GxE interaction (GEI) provides essential information for selecting and recommending cultivars in multi-environment trials. This study aimed to evaluate genotype (G) and environment (E) main effects and GxE interaction of 15 canola genotypes (10 canola lines and 5 check varieties) over 8 environments and to examine the existence of different mega environments. Canola yield performances were evaluated during 2015/16 and 2016/17 production season in three different locations (Southern Marmara, Thrace side of Marmara, and Black Sea regions) of Turkey. The trial in each location was arranged in a randomized complete block design with four replications. The seed yield data were analyzed using GGE biplot and the yield components data were analyzed using ANOVA. The agronomical traits revealed that environments, genotypes, and GEI were significant at 1 % probability for all of the characters. The variance analysis exhibited that genotypes, environments, and GEI explained 21.6, 21.7, and 25.7 % of the total sum of squares for seed yield, respectively. The GGE biplot analysis showed that the first and second principal components explained 57.3 and 18.3 % of the total variation in the data matrix, respectively. GGE biplot analysis showed that the polygon view of a biplot is an excellent way to visualize the interactions between genotypes and environments.