The effect of irrigation on the biochemical content of leafy vegetables
2015
Zeipina, S., Latvia Univ. of Agriculture, Jelgava (Latvia) | Alsina, I., Latvia Univ. of Agriculture, Jelgava (Latvia) | Lepse, L., Pure Horticultural Research Centre, Pure parish, Tukuma Municipality (Latvia) | Duma, M., Latvia Univ. of Agriculture, Jelgava (Latvia)
Leafy vegetables contain a lot of vitamins and minerals. Consumers more and more are thinking about a healthy and balanced diet. The aim of the research was to evaluate the effect of irrigation on the content of ascorbic acid and antioxidant activity in lettuce cv.‘Grand Rapids’ and leafy mustard cv ‘Scala’. Experiments were arranged in high plastic tunnels in Pūre Horticultural Research Centre during spring and autumn of 2013. As control was used variant with optimal soil moisture, as experimental plot- with moisture deficit. Available for plants moisture in the soil was detected by tensiometers. The content of ascorbic acid was determined by using titration with 2, 6- dichlorophenolindophenol in acidic solution. Antioxidant activity was determined by using the DPPH assay. The higher ascorbic acid content and antioxidant activity was detected in the control variant with optimal soil moisture. Higher content of vitamin C was observed in leaf mustard – three to seven times more than in lettuce. Antioxidant activity didn’t show quite clear differences regarding vegetable species and growing periods.
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