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- Selection for desirable plant types in two Maize Composite Varieties.
Selection for desirable plant types in two Maize Composite Varieties.
Abstract:
Two design I experiments were conducted to estimate some genetic parameters in maize usng CUBA GPO. I x Eto Amarillo and Cuba 40x cupurico composites studied were grain yield days to silking ear leaf area leaf angle and number of leaves per plant..
Six index selection methods were constructed based on the estmates obtained from design experiments. Two of the methods were essentially smith’s indexes whose objective was to maximize giants in selection for one primary character.
Results showed that car leaf area leaf area angle number of leaves per plant and days to silking had higher heritabilities thatn grain yield and grainstover ratio. Leaf angle, leaf area and days to silking had highly significant genetic correlations with gran yield, suggesting the possibility of obtaining greater yields from plants with larger and more erect leaves.
One the six index selection methods for maximizing grain yield alone was more efficient than direct selection, but this method could be result in such objectionable plant character as later maturity period. two other methods showed that number of days to silking could be could be maintained or decrease at the same tme obtain grain yield comparable to that of direct selection.
leaf size and graintover ratio significantly decreased with increasing plant density while again yield per unt land area increased. Early selection from composite Cuba Gpo. I x Eto Amarillo gave the highest grain yield and grainstover ratio at 80,000 plants per hetare and lower yield at 50,000 implying that genetic correlations are associated with plant dentisy levels.