Abstract
The influence of a top-dressing of nitrogen fertilizer (calcium nitrate, CaNO3) on the individual plant height and weight, herb yield and nitrate content of dragonhead (Dracocephalum moldavica L.) was studied in 1987 in Puumala, Finland. The nitrogen doses applied ranged from 0 to 270 kg/ha. Nitrogen fertilization increased both the individual plant height and weight, the fresh and dry herb yield and the nitrate content of the plants. However, no optimum nitrogen dose could be found since the maximum was not reached in most of the cases. An exception was the herb yield (d.w.) of transplanted plants, harvested at the flowering stage, where a nitrogen dose of 70—80 kg/ha gave the highest yield. If the plants were allowed to grow a few weeks more the yield was four fold compared to the earlier harvesting. Sown plants gave a yield two times higher than the transplanted plants, but this was partly due to the greater plant density on the sown plots.
Highlights
Dragonhead (Dracocephalum moldavica L., Lamiaceae) is an annual, 30—70 cm high, soft-stemmed plant with a bluish-purple or sometimes white inflorescence
The effect of nitrogen fertilization on the plant height, weight, herb yield, the proportion of leaves and the accumulation of nitrogen was studied in this work
The transplanted plants were treated with nitrogen doses ranging from 0 to 120 kg/ha
Summary
Dragonhead (Dracocephalum moldavica L., Lamiaceae) is an annual, 30—70 cm high, soft-stemmed plant with a bluish-purple or sometimes white inflorescence. The effect of nitrogen fertilization on the plant height, weight, herb yield (fresh and dry), the proportion of leaves and the accumulation of nitrogen was studied in this work. Regressions of the individual plant height and weight on the amount of nitrogen fertilizer.
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