SOLUBILITY OF FE, MN, CU and ZN FERTILIZERS AS A FUNCTION OF THE SUBSTRATE TYPE IN A DRIP IRRIGATION SYSTEM

C. Cadahía, P. García, J.J. Lucena, M.J. Sarro, A. Gárate
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.

Cadahía, C., García, P., Lucena, J.J., Sarro, M.J. and Gárate, A. (1988). SOLUBILITY OF FE, MN, CU and ZN FERTILIZERS AS A FUNCTION OF THE SUBSTRATE TYPE IN A DRIP IRRIGATION SYSTEM. Acta Hortic. 222, 179-186
DOI: 10.17660/ActaHortic.1988.222.21
https://doi.org/10.17660/ActaHortic.1988.222.21

Acta Horticulturae