ISHS Acta Horticulturae 751: IV International Symposium on Rose Research and Cultivation
EVALUATING COUNTER-ION EFFECTS ON GREENHOUSE ROSES SUBJECTED TO MODERATELY-HIGH SALINITY |
| Authors: | A.R. Solís-Pérez, R.I. Cabrera |
| Keywords: | chloride, sulfate, nitrate, osmotic effects, specific ion effects, rootstocks, Rosa spp., salt mixtures, sodium |
| Abstract:
‘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 Cl- than in R. × ‘Natal Briar’ plants, with lower values observed, in general, in plants irrigated with solutions containing Na2SO4. | |
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