Forage Yield Performance of Forage Pea ( Pisum sativum spp. arvense L.) Genotypes and Assessments Using GGE Biplot Analysis

Abstract

his study was conducted to evaluate the performanc e of forage pea ( Pisum sativum spp . arvense L.) genotypes, in terms of fresh forage yield and associated traits, when grown on the Kiziltepe Plain, Mardin, Turkey. Field trials were performed during the 2007-08 and 2009-2010 growing seasons. The experime nts were arranged according to randomized block design with three replications. Th e following trait ranges were reported: Days to 50% flowering: 147.5-162.5 days, Natural plant height and Main Stem Height: 45.58-72.75 cm, Main stem height: 52.52-100 .42 cm, Main stem numbers per plant: 1.275-1.658 stems plant -1 , Main stem thickness: 2.913-3.703 mm, Fresh forage yield: 10.43-23.83 t ha -1 and Dry matter yield: 2.525-5.891 t ha -1 . GGE (i.e., G+GE) biplot analysis showed that the two growing seasons were m arkedly different, stemming exclusively from differences in rainfall amounts be tween the two growing seasons. Results of this study showed that the lines 88P00-1-4-9-661 (1) and P101 (6), and cultivar Kirazli (9) were superior in terms of fresh forage yield, d ry matter yield, natural plant height and days to 50% flowering traits. At the same time, PC2 scores of these genotypes were found near to zero, so, they were identified as stable ge notypes for the investigated traits. In conclusion, in terms of forage yield, these three f orage pea genotypes are recommended for the Kiziltepe Plain growing conditions. Keywords: Biplot analysis, Dry matter yield, Forage yield com ponents, Genotype×year interaction, Kiziltepe Plain.