The objective of this study was to estimate the general combining ability of the parents and specific combining ability of hybrids for earliness traits for line selection. Inheritance and interrelationships of earliness characters were evaluated in a line x tester design. Three intermediate-early-maturing female (lines) which are grown regionally and four early-maturing males (testers) cotton varieties were crossed in 2003. The twelve F(1) and seven parents were planted randomized block design with three replications in 2004. For each earliness trait, general combining ability (GCA) and specific combining ability and gene effects were estimated using the line x tester method of analysis and also were determined heterosis and narrow sense heritability. Parents and their hybrids (except the monopodial branch) were significant for all the earliness traits studied. Estimates of variance due to GCA and SCA and their ratio revealed predominantly non-additive gene effects for date of first square, date of first flowers and harvested rate of first picking. Among the lines, Ersan 92 and Maras 92 and among the testers Acala Royal was found to be the best general combiners for most of the earliness characters. Four out of twelve crosses namely Ersan 92 x Chirpan 603, Ersan 92 x Acala Maxa, Maras 92 x Acala Royal and Nazilli 87 x Acala Royal were found to be the best crosses for investigated earliness characters.

Interspecific hybrid cottons (Gossypium hirsutum L. x G. barbadense L.) have great both yield and quality potential. This study was conducted to determine potential yields and quality characteristics of hybrid cotton varieties in southeastern Anatolia region of Turkey. The experiment was set out a completely randomized block design with four replications during 2003 and 2004 at University of Dicle, Faculty of Agriculture Experimental Field. Seven interspecific hybrid cotton varieties (48-08, Sevilla, Europe, Ica, Etna, 14-08 and Acalpi) which were obtained from Israel, and commonly grown varieties in this region, non-hybrid cotton varieties, GW Teks and DP-Opal were used as the materials of the study. Difference among the cultivars was significant for all traits except sympodial branch. Maximum number of boll and lint yield was 20.18 n plant(-1) and 1685.8 kg ha(-1) from interspecific hybrid cotton Ica, while interspecific hybrid cotton Europe recorded the lowest number of boll and lint yield. Interspecific hybrid cotton varieties showed higher value for fibre length, fibre fineness and fibre strength than non-hybrid cotton varieties. The longest fibres were obtained from Acalpi and Etna (34.08 and 33.88 mm), while non-hybrid varieties, DP-Opal and GW-Teks, had the lowest fibre length, 28.50 and 30.03 mm, respectively. The finest fibres obtained from Ica and 48-08 (3.42 and 3.45 mic.), the strongest fibres from Etna and Acalpi (40.07 and 40.23 g tex(-1)), and most elongation fibres from Acalpi (8.00%) and Sevilla (7.45%). Lint yield correlated positive and significant with fiber length.

Öz: Farklı tarla kapasitesi doygunluk derecelerinin (TKDD), pamuk çeşitlerinde bazı morfolojik özelliklere etkilerinin incelendiği bu çalışma, Dicle Üniversitesi Ziraat Fakültesi deneme alanında 2014-2015 yıllarında tesadüf bloklarında bölünmüş parseller deneme desenine göre 3 tekrarlamalı olarak yürütülmüştür. Ana parseller, farklı tarla kapasitesi doygunluk derecelerini (TKDD) (% 100, %80, %60, %40) alt parseller ise pamuk çeşitlerini (Stoneville-453, GW-Teks ve Deltaopal) oluşturmuştur. Çalışmada bitki boyu (cm), gövde çapı (cm), ana kök uzunluğu (cm), yaprak alan indeksi, boy/nod oranı ve pamuk kütlü verimi (kg/da) özellikleri incelenmiştir. 2014-2015 yılları ortalamasına göre pamuk çeşitlerinin ana kök uzunluğu değerleri, 40.25 cm (GW-Teks) ile 43.52 cm (Stoneville-453) arasında; farklı TKDD uygulamalarında ana kök uzunluğu değerleri, 31.15 cm (%100) ile 49.59 cm (%20) arasında değişim göstermiştir. Pamuk kütlü verimi yönünden çeşitler, 301.42 kg/da (GW-Teks) ile 335.71 kg/da (Stoneville-453) arasında; farklı TKDD uygulamaları ise 146.04 kg/da (%20) ile 506.38 kg/da (%80) arasında değişmiştir. Kuraklık stresi koşulları ile ana kök uzunluğu özelliği arasında negatif korelasyon; bitki boyu, boy/nod oranı, gövde çapı, yaprak alan indeksi özellikleri arasında ise pozitif korelasyon saptanmıştır. Determination of Effects of Deficit Irrigation on Some Morphological Properties ofCotton (G. hirsutum L.

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One of the objectives of this study was to estimate gene action and the type of inheritance of investigated traits in cotton. Another objective was to evaluate general combining ability of parents and special combining ability of F1 diallel crosses and to select the superior F1s that can be used in future breeding programs of cotton. Additive and dominant components were found significant for investigated traits. Number of bolls and lint percentages were effective in the control of additive type of gene action with partial dominance, but seed-cotton yield was also effective in the control of additive type of gene action with over-dominance. Greater parents were ‘Paum-15’ and ‘Stoneville-453’ for the number of bolls and the seed-cotton yield; ‘Stoneville-453’ and ‘Nazilli-84S’ for the lint percentage. Greater cross combinations were ‘Paum-15’ x ‘Stoneville-453’; ‘Stoneville-453’ x ‘Nazilli-84S’; ‘Stoneville-453’ x ‘Fantom’; ‘Stoneville-453’ x ‘Delcerro’ and ‘Stoneville-453’ x ‘Giza-45’ diallel crosses for the number of bolls; ‘Paum-15’ x ‘Nazilli-84S’, ‘Stoneville-453’ x ‘Fantom’, ‘Nazilli-84S’ x ‘Delcerro’ and ‘Nazilli-84S’ x ‘Giza-45’ diallel cross for the lint percentage, ‘Paum-15’ x ‘Stoneville-453’, ‘Paum-15’ x ‘Nazilli-84S’, ‘Stoneville-453’ x ‘Nazilli-84S’, ‘Stoneville-453’ x ‘Fantom’, ‘Stoneville-453’ x ‘Delcerro’, ‘Stoneville-453’ x ‘Giza-45’, ‘Nazilli-84S’ x ‘Fantom’ and ‘Nazilli-84S’ x ‘Delcerro’ diallel crosses for the seed-cotton yield.

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Bu çalışma, pamukta farklı zamanlarda kesilerek uzaklaştırılan tepe sürgünü uygulamasının pamuk lif kalite özellikleri üzerine etkisinin belirlenmesi amacıyla 2012 yılında Dicle Üniversitesi Ziraat Fakültesi Deneme Alanlarında yürütülmüştür. Çalışmada Primera, Deltapine-499, Stoneville-453 ve Berke pamuk (Gossypium hirsutum L.) çeşitleri materyal olarak kullanılmıştır. Deneme Tesadüf Bloklarında Bölünmüş Parseller Deneme desenine göre 3 tekerrürlü olarak kurulmuştur. Uygulama zamanları (Kontrol, ekimden 100, 115, 130 ve 145 gün sonra uç alma) ana parselleri, pamuk çeşitleri ise (Primera, DP-499, STV-453 ve Berke) alt parselleri oluşturmuştur. Çalışmada ekimden 100 ve 115 gün sonra yapılan uç almanın, lif uzunluğunu artırdığı; lif verimi, lif inceliği, kısa lif oranı, lif kopma dayanıklılığı, iplik yapılabilirlik indeksi, lif üniformitesi ve lif kopma uzaması özelliklerine ise istatistiki olarak herhangi bir etkisinin olmadığı belirlenmiştir.