Iwona Domagała-Świątkiewicz1, Włodzimierz Sady1,
Piotr Muras2
Z 1Katedry Uprawy Roli i Nawożenia Roślin Ogrodniczych,
oraz z 2Katedry Roślin Ozdobnych
Akademii Rolniczej im. Hugona Kołłątaja w Krakowie
Abstract. In the present investigations with Stewartia pseudocamelia the fertilizer value as well as the effect of the fertilizer polymer preparations GNSU-70 and AQUA FLO-70 on the physico-chemical properties of the substrates in comparison with the fertilizer of controlled component releasing Osmocote Plus were evaluated. The decrease of the bulk density and increase of the water capacity of substrates enriched with the polymers were stated. Addition of potassium polyacrylates to substrate caused releasing of the considerable amounts of K+ - ions do the soil solution during plant growing. The higher content of P and K and lower content of Mg and Ca were determined in tissue of plants grown on GNSU and on AQUA FLO in comparison with Osmocote.
Key words:
hydrophilic polymers, nutrient release, water holding capacity
Summary
In the present investigations with Stewartia pseudocamelia the fertilizer value as well as the effect of the fertilizer polymer preparations GNSU-70 and AQUA FLO-70 on the physico-chemical properties of the substrates in comparison with the fertilizer of controlled component releasing Osmocote Plus were evaluated. The decrease of the bulk density and increase of the water capacity of the substrates enriched with the polymers were stated. Addition of potassium polyacrylates to the substrate caused releasing of the considerable amounts of K + ions to the soil solution during plant growing. The higher content of P and K, and lower of Mg and Ca were determined in tissue plants grown on GNSU and on AQUA FLO than in the substrates with Osmocote. The reduced level of magnesium and calcium in the substrate and the poorer nourishment with these elements of the plants grown on the substrates with addition of polyacrylates, can be the evidence of the strong retaining of the divalent cations in the polymer structure and, hence, the decrease of their availability for plants.