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Agronomy Journal Abstract -

Effect of Irrigation, Harvest Interval, and Nitrogen on the Yield and Nutrient Composition of Napiergrass (Pennisetum purpureum)1


This article in AJ

  1. Vol. 64 No. 3, p. 396-398
    Received: Dec 1, 1971

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  1. Modesto Capiel and
  2. Gaylen L. Ashcroft2



Studies were conducted in a subhumid area of Puerto Rico to investigate the main effect and the interrelations of harvest interval, irrigation, and N fertilization on the yield and nutrient composition of napiergrass (Penniseturn purpureum). Harvest interval exerted the main effect on the dry matter yield of the forage. Nitrogen fertilization and irrigation also had highly significant effects. Irrigation interacted significantly with harvest interval to influence forage yield. The increase in yield as a result of a longer harvest interval was nearly 92% greater on irrigated than on nonirrigated plots.

Nitrogen fertilization produced a highly significant increase in the protein yield of the forage. No other management treatment appreciably influenced protein yields. Significant negative correlations were obtained between yield and both N and K composition for the forage on the frequently harvested, irrigated plots. Both nutrients were at lower concentration in the forage produced in harvest periods that had high yields.

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