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In a laboratory experiment, Ruppia drepanensis Tineo seedlings from a brackish marsh in southern Spain were grown with and without potassium nitrate (1.4 g N m(-2) week(-1) added to the water column), both under nutrient-rich (clay:sand mixture) and nutrient-poor (sand) sediment conditions. Potassium nitrate fertilisation delayed flower initiation within both types of sediment, but it also resulted in increased flower abundance under nutrient-poor sediment conditions. Differences between plants in flower production were positively correlated with the above- to belowground biomass ratio, We thus propose that nutrient supply and biomass allocation should be incorporated in the age- and size-dependent models for plant reproductive effort. These models should also consider separately the induction of flowering and the production of flowers (flower abundance). [KEYWORDS: RUPPIA DREPANENSIS, NITRATE FERTILIZATION, FLOWERING TIME]
Original languageEnglish
Pages (from-to)45-58
JournalAquatic Botany
Volume52
Issue number1-2
DOI
StatePublished - 1995

ID: 238948