Abstract
The studies concerned evaluating the effect of the sowing date and the stage of harvest of coriander upon the fresh herb yield and chemical composition. The seeds were sown in the following dates: March 7th, 14th, 20th and 28th . The harvest was conducted in two phases of plant development, in each of the four sowing dates: in the generative and vegetative phase. During harvest, the fresh herb weight was determined, then the material was chemically analyzed and the following contents were determined: dry matter, sugars, L-ascorbic acids and chlorophyll. The essential oil content in air-dry herb was determined as well. The coriander from the first and the second dates of sowing had the highest yield of fresh herb weight, with the highest contents of total sugars, L-ascorbic acid and chlorophyll. Delaying the sowing date contributed to a decrease of fresh herb yield and the contents of the above-mentioned substances, with a larger share of dry matter and reducing sugars. The plants collected in the generative phase had a higher fresh herb yield, as well as a higher share of dry matter and essential oil than those collected in the vegetative phase. However, the raw material collected in the vegetative phase was distinguished by a higher concentration of L-ascorbic acid and chlorophyll, compared to the remaining material. Concentrations of reducing and total sugars were not significantly dependent upon the phase of coriander material harvest.
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