Zeki Mut

Comparison of stability statistics for yield in barley (Hordeum vulgare L.).

Analysis of multienvironment trials (METs) of crops for cultivar evaluation and recommendation is an important issue in plant breeding research. Evaluating both stability of performance and high yield is essential in MET analyses. The objectives of this study were to assess interrelationship among these measures and to identify high-yield and stable barley ( Hordeum vulgare L.) cultivars in 11 environments during 2001 - 2003 in the central Black Sea region of Turkey. Significant differences were observed among barley cultivars for grain yield, thousand-grain weight, hectoliter weight, plant height and heading date. In this study, high values of TOP (proportion of environments in which a genotype ranked in the top third) was associated with high mean yield, but the other methods were not positively correlated with mean yield and instead characterized a static concept of stability. The results of principal component (PC) analysis and correlation analysis of parametric and nonparametric stability statistics and yield indicated that only TOP method would be useful for simultaneously selecting for high yield and stability. This method recommended Fahrettinbey and Sladoran as stable and Balkan 96 and Erginel as unstable genotypes. A biplot of the first two PCs also revealed that the stability statistic methods grouped as three distinct classes that corresponded to different dynamic (agronomic) and static (biological) concepts of stability.

Samsun İlinde Çeltik Tarımının Durumu ve Üretimi Artırmak İçin Öneriler

Samsun province is in second rank after Edime province according to paddy sown area and production. Samsun province is over the average of the world and Turkey according to rice yiled. The facilities increasing the paddy sown area and paddy yield occur in Samsun province. These facilities can be agricultural areas, water resources, climate, paddy yield, paddy production by using transplanting system, profit comparing the other crops. It can be said that paddy sown areas can be increased 2-3 times at least by evaluating the rice marketing. The paddy yield, which is 639 kg da -1, can be increased 700-800 kg da by solving the ecological, socio-economical, technological, using input, agronomical and marketing problems in order to increase the yield per area.