The regulation of clover shoot growing points density and morphology during short-term clover decline in mixed swards

Autor: M.C. Arregui, Jean-François Soussana, F. Vertès
Přispěvatelé: UR 0874 Unité de recherche Agronomie de Clermont, Institut National de la Recherche Agronomique (INRA)-Environnement et Agronomie (E.A.)-Ecologie des Forêts, Prairies et milieux Aquatiques (EFPA), Institut National de la Recherche Agronomique (INRA)-Unité de recherche Agronomie de Clermont (URAC), Station d'agronomie, Institut National de la Recherche Agronomique (INRA)
Rok vydání: 1995
Předmět:
Zdroj: ResearcherID
European Journal of Agronomy
European Journal of Agronomy, Elsevier, 1995, 4 (2), pp.205-215
ISSN: 1161-0301
DOI: 10.1016/s1161-0301(14)80047-6
Popis: The spring growth of infrequently cut mixed swards, with or without inorganic fertilizer nitrogen applied, was studied at two sites. During regrowth, a decline in the sward clover content to 20–30 per cent of the initial clover content was observed in some situations (in N-fertilized swards, or during early spring growth). Changes in the density and in the morphology of clover shoot growing points were analysed during this decline in clover content. After 40 to 50 days of regrowth, the mean density of clover shoot growing points declined by 35 to 67 per cent. The mean number of growing points per branch was reduced by 17 to 69 per cent and the mean branch density by 21 to 55 per cent. The mean biomass per a clover shoot growing point was negatively correlated with growing point density and the decline in the mean growing point density was accompanied by a 200 to 300 per cent increase in the mean biomass per growing point, which indicated an asymmetrical mortality of clover shoot growing points. Clover leaf area per unit shoot weight was negatively correlated with the mean size of a growing point and, accordingly, clover leaf area ratio declined after approximately 30 days of regrowth. The links between the asymmetrical mortality of clover growing points, competition for light and the short-term decline of white clover within mixed swards allowed to regrow to a high leaf area index, are discussed.
Databáze: OpenAIRE
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