The objectives of this study were to evaluate dry matter (DM) yield and seed yield of six leafed and semi-leafless pea (Pisum sativum L.) genotypes, and to compare them for these traits. Evaluation of genotype × environment (G × E) interaction, stability and cluster analysis were also carried out at eight diverse locations with typical Mediterranean and Mediterranean-type climate during the 2001-2002 and 2002-2003 growing seasons. Significant differences were found among the pea genotypes for DM and seed yield on individual years and combined over years, and in all locations. All interactions which related to G × E interaction showed significance (P>0.001) for DM and seed yield. The highest yield (4789 kg ha -1 ) was obtained from the leafed genotype 'Urunlu'. However, stability analysis indicated that for DM yield, the leafed genotypes 'Golyazi' and 'Urunlu' should be grown in low yielding and high yielding environments, respectively. Cluster analysis, based on grouping locations, showed that P101 was the preferred variety in low yielding environments, and P98, in high yielding ones. It was suggested that the use of both stability and cluster analyses might give better results. Comparison of cluster and stability analyses showed that the stability analysis fails to recommend cultivars to different regions where yield potential showed significant differences. It seems, however, that cluster analysis could be a powerful tool to examine G × E interaction. If the number of environments was sufficient, a separate stability analysis could be run in each cluster.Additional key words: adaptation, cluster, leafed and semi-leafless peas, Mediterranean conditions, stability. ResumenInteracción genotipo × ambiente y análisis de estabilidad para rendimiento de materia seca y de semilla en guisante (Pisum sativum L.)Los objetivos de este estudio fueron evaluar y comparar el rendimiento de materia seca (DM) y de semilla de seis genotipos de guisante con hojas convencionales y semiafilas. Además, se evaluó la interacción genotipo × ambiente (G × E) y se realizaron análisis de estabilidad y tipo cluster en ocho localidades de clima mediterráneo, durante las temporadas 2001-2002 y 2002-2003. Se encontraron diferencias significativas entre genotipos para rendimiento de DM y de semilla, tanto para años individuales como combinados, así como en todas las localidades. Todas las interacciones G × E fueron Field pea adaptation and stability 97 significativas (P>0,001) para rendimiento en DM y semilla. Se obtuvo la producción más alta (4789 kg ha -1 ) con el genotipo de hoja convencional 'Urunlu'. El análisis de estabilidad indicó que, para rendimiento en DM, los genotipos 'Golyazi' y 'Urunlu' deben cultivarse en ambientes de baja y alta producción, respectivamente. El análisis cluster, basado en agrupamiento de localidades, mostró que la variedad P101 fue la mejor en ambientes de baja producción, y la P98 en los de alta producción. Al comparar los análisis de estabilidad y de tipo cluster se vio que el primero falla al recome...

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In an attempt to investigate the turfgrass and playing quality characteristics of some newly introduced warm season turf grasses and traditional cool season sports turf mixture, classical and contemporary techniques were imposed on the turfgrass experimental plots of the research area of Department of Field Crops, Agriculture Faculty of Ege University, Bornova/Izmir/Turkey. Some warm season turfgrasses (Cynodon dactylon cv. SR9554, Cynodon dactylon x Cynodon transvaalensis cv. Tifway-419, Paspalum vaginatum cv. Sea Spray and Zoysia japonica cv. Zenith) and traditional cool season sports turf mixture were tested in terms of visual turf quality and playing quality traits (ball rebound, ball roll and shock absorption) on a monthly and seasonal bases for three years under Mediterranean environmental conditions. Significant variations were determined among the turfgrass alternatives in all traits except years. It was concluded that Tifway-419 and Sea Spray turf grasses were the most successful and promising alternatives compared to the other options under Mediterranean environmental conditions.

ÖZET u çalışma, Ege Üniversitesi Ziraat Fakültesi Tarla Bitkileri Bölümü'nün Bornova'da bulunun deneme tarlalarında, 2012-2014 yılları arasında 2 yıl süreyle sürdürülmüştür. Araştırmada, farklı biçim zamanlarında [I. Erken ilkbahar (Mart ayının son haftası), II. İlkbahar ortası (Nisan ayının ikinci haftası) ve III. Geç ilkbahar (Nisan ayının son haftası)] hasatları yapılan İtalyan çimi + baklagil yembitkisi karışımlarının (Vicia sativa, Lathyrus sativus, Pisum arvense) farklı karışım oranlarındaki (sırasıyla İtalyan çimi + baklagil olmak üzere; %100+0, %80+20, %60+40, %40+60, %20+80 ve %0+100) hasıl verimi ve verimle ilgili bazı özellikleri incelenmiştir. İki yıllık ortalama sonuçlara göre, Akdeniz iklim koşullarında kışlık ikinci ürün olarak değerlendirilen İtalyan çimi + baklagil karışımlarından sağlanan en yüksek verim değerlerinin, geç ilkbahar dönemindeki hasatlardan elde edildiği saptanmıştır. Ayrıca, yalın olarak yetiştirilen adi fiğin de en yüksek yeşil ot, kuru madde ve ham protein verimini (sırasıyla; 5378 kg/da, 1148 kg/da ve 230 kg/da) sağladığı sonucuna varılmıştır. Hasat zamanının ilerlemesiyle hasattaki baklagil oranı, NDF ve ADF oranları da artış göstermiştir. ABSTRACT his study was conducted in order to determine the effects of different harvest dates (Early Spring; the last week of March, Mid Spring; second week of April and Late Spring; last week of April) and various mixture rates (mixture of italian ryegrass + legume; 100+0%, 80+20%, 60+40%, 40+60%, 20+80% and 0+100%, respectively) of some annual legumes (Vicia sativa, Lathyrus sativus and Pisum arvense) with Italian ryegrass on the herbage yield and other yield characteristics. The field trials were carried out at Bornova Experimental Station, Ege University Faculty of Agriculture during the years of 2012-2014. As the average of 2-year results, it was determined that the highest yields were obtained from İtalian ryegrass + legume mixtures sown as winter second crop and harvested in late spring under Mediterrenean climatic conditions. However, the data also indicated that pure common vetch sowing provided the highest green matter, dry matter and crude protein yields, being 5378 kg/da, 1148 kg/da and 230 kg/da, respectively. Legume ratio, NDF and ADF rates increased by advancing harvest dates.

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