Influence of a non-woven textile covering on the content of nutrient compounds of lettuce
2009
Koudela, M.,Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju | Petrikova, K.,Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic)
Two cultivars of leaf and one cultivar of head lettuce were evaluated in a three-year experiment carried out in Lednice (Czech Republic) in spring of the years 1998-2000. The lettuces were grown with or without a non-woven textile. After harvest, weights of leaf rosettes and heads, as well as concentrations of vitamin C, minerals (K, Na, Ca, Mg), fibre, dry matter and nitrates were determined. The use of a non-woven textile covering reduced significantly the levels of vitamin C (from 202 to 132 mg/kg), K (from 3,628 to 3,081 mg/kg) and dry matter (from 80.3 to 67.4 g/kg). The levels of Na, Mg, Ca and the weights of leaf rosettes and heads increased, but not significantly. Mg and Ca concentrations were significantly higher in leaf (154 and 275 mg/kg, respectively) than in head cultivars (107 and 181 mg/kg, respectively). The head of Lednicky cultivar was significantly heavier than the leaf rosette of Lollo Rossa (260 g vs. 208 g). There were significant variations from year to year in all the observed variables, with the exception of vitamin C.
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