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Agronomy Journal Abstract -

Comparison of Growth Stages of Sorghum Forage Types as to Yield and Chemical Composition


This article in AJ

  1. Vol. 60 No. 6, p. 669-672
    Received: Apr 22, 1968

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  1. George F. Worker Jr. and
  2. Vern L. Marble2



A 2-year study of harvesting three types of forage sorghum — sudangrass, sorghum-sudangrass hybrids, and sorgo — at pasture, boot, flower, and soft-dough stages was undertaken to evaluate dry-matter production, chemical composition, and digestibility predicted from chemical analyses.

Dry-matter yields generally increased in all types as harvest was delayed, with sorgo making the largest increase at the soft-dough stage.

Percent ash, crude protein, and fat decreased as harvest was delayed with little difference occurring between forage types. All cultivars declined in fiber when harvested after the flower stage. Total sugar percent increased as harvest was delayed for all forage types.

Sudangrass and sorghum-sudangrass TDN percent was lowest when cut at flower stage of maturity, whereas the sorgo steadily increased from the earliest harvest to the latest.

Forage quality, except for crude protein which decreased sharply as harvest was delayed, was approximately equal for all forage types. Dry-matter production varied considerably by forage types and stage of harvest indicating the utilization of sudangrass for pasture or green chop; sorghum-sudangrass hybrid for pasture, green chop, or silage; and sorgo for silage.

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