EVALUATING COUNTER-ION EFFECTS ON GREENHOUSE ROSES SUBJECTED TO MODERATELY-HIGH SALINITY

‘Bull’s Eye’ rose plants budded on the rootstocks Rosa manetti and R. × ‘Natal Briar’ where grown in 20-L containers filled with a peat: pine bark: sand substrate (3:1:1 v/v). They were irrigated with a 0.5X Hoagland solution salinized with a fixed 12 mM Na solution made up of seven ratios of NaCl, Na₂SO₄ and NaNO₃ (100:0:0, 50:50:0, 0:100:0, 0:50:50, 0:0:100, 50:0:50 and 33:33:33). Results after four flushes of growth and flowering showed higher dry weight productivities in R. manetti plants.
Salt composition (i.e. counter-anion ratios) significantly affected the dry weight yield of ‘Natal Briar’ plants, with those irrigated with 100% Na₂SO₄ and NaNO₃ having the highest and lowest values, respectively.
While the plant on R. manetti have not yet shown significant responses to salt composition, there is a strong tendency for higher dry weight yields in binary salt (anion) compositions.
Leachates collected throughout the study showed similar pH (7.5) and electrical conductivities (4.7 dS.m^-1). Leachate Cl^– concentrations were linearly correlated with Cl^– application, whereas leachate Na⁺ concentrations remained similar among treatments.
Plants on R. manetti accumulated less leaf Na⁺ and C^l– than in R. × ‘Natal Briar’ plants, with lower values observed, in general, in plants irrigated with solutions containing Na₂SO₄.

IV International Symposium on Rose Research and Cultivation

A.R. Solís-Pérez, R.I. Cabrera

chloride, sulfate, nitrate, osmotic effects, specific ion effects, rootstocks, Rosa spp., salt mixtures, sodium

https://doi.org/10.17660/ActaHortic.2007.751.47