Effect of temperature and time of nutrient solution storage on the available iron content in iron chelates
2005
Komosa, A.,Akademia Rolnicza, Poznan (Poland). Katedra Nawozenia Roslin Ogrodniczych | Chohura, P.,Akademia Rolnicza, Wroclaw (Poland). Katedra Ogrodnictwa | Roszyk, J.,Akademia Rolnicza, Poznan (Poland). Katedra Nawozenia Roslin Ogrodniczych
Laboratory studies were carried out on chelate Fe-Forte produced on the basis of ligands EDTA + HEEDTA and Librel Fe-DP7 with ligand DPA, which were commonly used to preparing of nutrients solution applied to fertigation of greenhouse tomato grown in rockwool. It was analysed the effect of storage time of nutrient stock solution concentrated 100-times (in relation to hydroponic concentration) in which the source of iron where those chelates, on the content of Fe-available after their diluting to the hydroponic (useful) concentrations - satisfied to greenhouse tomato grown in rockwool - which was 1.5-2.0 mg Fe/dm. These changes were analysed after 0, 1, 2, 4, 7, 10, 14 and 17 days of storage of concentrated (100-times) nutrient stock solution in temperatureb 10 and 20 deg C. It was tested also changes of Fe-available after 15 and 13 minutes from diluting concentrated stock solution to the hyroponic concentrations. It was found out that prolongation of storage period of concentrated stock solutions to hydroponic concentrations was higher in samples analysed after 60 minutes in comparing to minutes from diluting
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