The effect of nitrogenous fertilizer on the photosynthesis and growth of white clover trifolium repens cultivar blanca and perennial ryegrass lolium perenne cultivar s 23 swards

Dennis, W.D.; Woledge, J.

Annals of Botany 55(2): 171-178


ISSN/ISBN: 0305-7364
Accession: 006649952

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The application of N fertilizer in March to a white clover (cv. Blanca) and perennial ryegrass (cv. S23) sward resulted in a rapid suppression of the clover, relative to clover in a treatment given no added N. Thereafter, the clover in both treatments grew more rapidly than the grass and its proportion of the total leaf area in the mixture increased, as the leaf area index rose to 8. After a 2nd application of N in early July, clover was not suppressed to the same extent as in the 1st growth period. The photosynthetic capacities of newly expanded clover laminae were similar in the 2 treatments. Clover laminae had higher photosynthetic capacities than grass, even in the grass-dominant + N treatment. Lamina area, petiole length and the number of live leaves per stolon were similar in the 2 treatments, indicating that the differences in total leaf area were due to the presence of fewer stolon growing points in the + N treatment.