ISHS Acta Horticulturae 424: II International Rose Symposium
CHANGES IN NUTRIENT SOLUTION CAUSED BY VOLCANIC CINDER MEDIA OF SOILLESS GREENHOUSE ROSES. IN THE CANARY ISLANDS |
| Authors: | M.C. Cid-Ballarín, A.R. Socorro-Monzon, N. Zieslin |
| Abstract:
Results of soilless culture of roses on tuff media obtained by Israeli growers are encouraging studies concerning the use of basaltic cinders, abundant in the Canary Islands. A factorial trial growing roses in three-particle-size cinder media and three drip irrigation frequencies, with a non-return nutrient solution, was carried out. Physicochemical properties of cinders were determined, and drainage periodically analyzed during the first culture year. Cinders showed a relatively low exchange capacity (variable with pH), and a high content of chemically unstable volcanic glass. Main solution changes were: reduction of phosphate and K content, release of Mn when pH ≤ 6, and increase of Mg and Na. Origin of these changes that affect rose growth are discussed. | |
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