Effects of Shading and Nitrogen on Growth of Grass-Alfalfa Pastures1
- Wing-To Chan and
- A. F. MacKenzie2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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