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Genetic Variability among Forage Sorghum Accessions for Green Forage Yield and Seedling Growth Parameters

Ahmed S, Nadeem Tahir M. H, Sadaqat H. A, Fatima B.


Livestock population is increasing day by day, but in Pakistan fodder shortage still is the limiting factor for livestock production. There is still gap of 38% and 26% of crude protein and total digestible nutrients respectively. So the present research was conducted to find possibility to overcome the gap between demand and supply. Ninety six forage sorghum accessions were obtained from National Fodder Research Programme, National Agricultural Research Centre, Islamabad and evaluated in two different experiments. First experiment was conducted in metallic trays filled with fresh river sand to record the data on seedling traits. Second experiment was conducted in field to record the data on forage yield and its component traits. Genetic variation among the accessions was observed for most of the traits. Fresh shoot and root weight, dry shoot and root weight, root shoot ratio and relative growth rate, plant height, leaf area, number of leaf per plant, leaf to stem ratio, fresh and dry biomass had high heritability and were under the control of additive gene action while other traits showed low heritability non-additive gene action. Accessions 010028, 009976 and 010036 performed best for green forage yield as compared to other accessions. Fresh biomass displayed significant and positive correlations with fresh and dry shoot weight, relative growth rate, plant height and leaf area. The results of present study suggested that high yielding forage sorghum varieties may be developed by exploiting genetic variability in accessions and improvement may be achieved through improving component attributes for green forage yield.

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