Regional study and evaluation of stability of new forage sorghum varieties
2011
Fouman, Aziz | Beheshti, Seyed Alireza | Jafariani, Mostafa
The present study was designed to find out the variation and adaptability in forage yield of sorghum genotypes . An experiment was carried out at Torogh Agricultural and Natural Resource Research Station(Mashhad-Iran) during 2007-2009. 15 new forage sorghum lines were evaluated in a RCBD with four replications. Bartlet test showed that variance for years in all investigated traits wer uniqe and the combined analysis were formed. The results of combined analysis of variance indicated that there were significant effects( P≤0.01 ) for years, genotypes, and their interactions on feresh forage yield . there were also significant effects( P≤0.05 ) for years and genotypes, on dry matter yield. . Maximume green fodder and dry matter yield was produced by KFS1, KFS3 and KFS2 lines with 79.89, 77.20 and 19.47 tone per hectar for fresh forage and 16.37,17.24 and 16.93 ton per hectar for dry matter respectively. Maximume fresh and dry matter yield was obtained in second and third years with 80.84 and 19.47 ton per hectar respectively. Analysis of variance base on split plot in time reveled that effect of harvesting time on fresh forage weight ,dry matter , main stem diameter and tilers number in each years were significant. The effect of genotyp and genotype× harvesting time interaction was significant on second year. The maximum data for stem diameter, fresh and dry matter yield were recorded in first harvest and for number of tillers per plant in second harvest in all three years.Therefore , it was concluded that these differences in forage yield and morphophsiological traits under diverse environments (years)were due to differences in genotyps, soil fertity, drought,temperature and other climatic conditions.
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