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This article in AJ

  1. Vol. 63 No. 5, p. 667-669
     
    Received: June 9, 1970


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doi:10.2134/agronj1971.00021962006300050003x

Effects of Shading and Nitrogen on Growth of Grass-Alfalfa Pastures1

  1. Wing-To Chan and
  2. A. F. MacKenzie2

Abstract

Abstract

The relative competitiveness of alfalfa under varying nitrogen and shade conditions must be known to manage grass-legume mixtures for maximum yield and quality of hay. Therefore, the growth of a grass-legume mixture (predominantly Phleum-pratense L. and Medicago sativa L.) under artificial shading and with added nitrogen was studied under field conditions in Quebec in 1967 and 1968. At low N levels, the alfalfa was a stronger competitor in the mixture under full sunlight, irrespective of the stage of growth. At high N levels, alfalfa yields were decreased due to increased grass growth. However, shading had very little effect on the competitive ability of the alfalfa at high N levels. Grass with upright leaves should permit more effective competition by alfalfa.

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