Abstract
In our trials at the experimental farm Pallag of Debrecen University 3 asparagus varieties ( Cumulus, Gijnlim, Grolim ) were tested on brown humus sand soil in ridge cultivation. Solids, nutritional fibre, protein, sugar and vitamin-C contents were measured in the white spears at 3 different harvest times (8 May, 24 May, 6 June 2012). Mineral element tests included B, Ca, Cu, Fe, K, Mg, Na, P, S, Zn and sulphate sulphur. Our trials confirmed the strong negative correlation (r = -0.828) between the sugar and vitamin-C content of the spears. In our variety comparison trial the variety Cumulus had the highest solids (7.1 %), nutritional fibre (4.7 %), protein (2.81 %) and sugar (3.51 %) contents. Among the microelements the high Fe content (4.93 – 7.63 mg/kg) deserves attention. Fe is variety dependent. The highest value was found in Gijnlim with 7.5 mg/kg. The sulphate-S content is responsible for the special taste and flavour of asparagus. In our trials Cumulus had the highest sulphate-S value (279 mg/kg). Cumulus also excelled in Mg content (84.10 mg/kg) and Grolim in Ca content (27,23 mg/kg). The low Na content of the element composition is essentially favourable. It varied between 17.07 and 27.23 mg/kg in the tested 3 varieties.
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