Nitrogen influence and frequency of collections in the production of leaves and essential oil of rosemary (Rosmarinus officinalis)
DOI:
https://doi.org/10.70151/mg9zkb36Keywords:
Rosmarinus officinalis L., Dry mass, Fertirrigation, Aromatic plantsAbstract
The objective of this research was to determine the effect of nitrogen concentration and the periodicity of harvests on leaf growth and essential oil production of rosemary plants in soilless cultivation. Plants were grown in 3 dm3 polypropylene pots filled with sand and fertigated by means of nutrient solutions at N concentrations of 5.55; 8.05; 10.55; 13.05 and 15.55 mmol/l, without variations in concentrations of the other nutrients. The total number of harvests during the experimental period varied from one to four (C1, C2, C3 and C4). In C4, the first harvest was made in April 2013, at 90 (DAP), and repeated three times reaching four harvests at the end of the experiment; in C3, the first harvest was in July 2013, at 180 DAP, and repeated two times, reaching three harvests; in C2, the first harvest was in October 2013, at 270 DAP, and repeated once a time, reaching two harvests; in C1, only one harvest was made in January 2014, at 365 DAP, any harvest being done before. A 5x4 factorial entirely randomized experimental design was used, with 44 plants per plot. It was determined the leaf production and yield of essential oil extracted in a Clevenger. Results showed that leaf production and yield of essential oil are higher by making only one harvest at 365 DAP and using a nutrient solution at N concentration of 9.40 mmol/l.
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