Ocena wpływu rozstawy rzędów na plon ziela Chelidonium majus L. oraz wartość biologiczną surowca^**

*Romuald Mordalski, Wojciech A. Kucharski, Agnieszka Gryszczyńska, Waldemar Buchwald

Summary
The studies were carried out in 2011-2013. The experimental factor was the variable row spacing influencing the amount of seed per unit area: a) 20 cm (seeding rate 10 kg·ha^-1), b) 30 cm (7.5 kg·ha^-1), c) 40 cm (5 kg·ha^-1). The yield of fresh and dry weight of herb (after drying in the chamber dryer) harvested twice during growing season was determined. The content of alkaloids (expressed as chelidonine) in the raw material was quantified.
High variability of yield of Chelidonium majus in the first year of cultivation was observed. Its height depended on row spacing. The highest total yield (1^st + 2^nd crop) was obtained at the smallest row spacing (20 cm). The increase in the row spacing to 40 and 30 cm resulted in decrease of dry mass of herb of about 35 to 60%. In the second year of cultivation, yield was on average about 40% higher as compared to the first year. Row spacing of 30 and 40 cm resulted in a reduction in the yield of raw material of about 35 and 50%, as compared to the 20 cm spacing. There was no correlation between the levels of alkaloids in raw material and row spacing.

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