ISHS Acta Horticulturae 222: Symposium on the Fertilization of Vegetables under Protected Cultivation
SOLUBILITY OF FE, MN, CU and ZN FERTILIZERS AS A FUNCTION OF THE SUBSTRATE TYPE IN A DRIP IRRIGATION SYSTEM |
| Authors: | C. Cadahía, P. García, J.J. Lucena, M.J. Sarro, A. Gárate |
| Abstract:
Knowledge about micronutrient supply to vegetables under protected cultivation is very scarce. Eight micronutrient fertilizers were allowed to react with six substrates (peat, treated peat, peat+CaCO3, soil-1, soil-2 and sand) used in drip irrigation in Spain. Solubility of Fe, Mn, Cu and Zn as a function of type of chelating agent (EDTA, EDDHA, DTPA and Polyflavonoid) and of culture substrate used was studied. Fe added as fertilizers containing Fe-EDTA lost solubility by 35–55% in both soils which are high in CaCO3 but remained mostly in solution with sand, peat and treated peat. For peat+CaCO3 results showed wider variations. Fe-EDDHA remained soluble after having been shaken with both soils but showed a decreased solubility in peat, peat-CaCO3 and treated peat. Soluble Fe from Fe-polyflavonoid was significant only for soil-2. Mn solubility decreased strongly for all chelates and substrates used and practically disappeared in peat treatments. Cu and Zn remained in solution with both soils, showed increased solubility with peat-CaCO3 and treated peat and decreased solubility with peat, except for Zn-DTPA. | |
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