THE EFFECT OF PLUVIO-THERMAL CONDITIONS AND CHANGING DAY LENGTH ON WHITE MUSTARD (Sinapis alba L.) DEVELOPMENT
Journal Title: Acta Scientiarum Polonorum – Agricultura - Year 2017, Vol 16, Issue 3
Abstract
Background. White mustard is a plant whose economic importance is gradually increasing. This is a result of the growing demand for its seed material due to a more common use of its green biomass in the developing systems of integrated and organic crops. The aim of the study was to estimate the effect of the sowing date of white mustard cultivar `Nakielska` on plant development, the length of growing period and the ability to achieve full seed maturity. Material and methods. The study presents the results of a three-year field experiment on white mustard (Sinapis alba L.). It was a one-factorial experiment in the randomized complete block design with four replications. The variable factor was the sowing date. White mustard was sown on 13 dates at seven-day intervals, from the beginning of April to the end of June or beginning of July depending on year, and harvested after reaching seed maturity. Results. For successive sowing dates, starting in April, the total average daily temperature at maturity systematically increased until it reached a maximum for the plants sown at the beginning of May. Maturation of white mustard sown from the end of May happened at successively lower temperatures, and the lowest total of average daily temperatures was recorded at sowing date 13. The average day length for the period from sowing to emergence of white mustard lengthened at sowing dates from the beginning of April to the beginning of June and for the next sowing dates (10–13) it shortened, reaching eventually 16.6 hours. With delayed sowing of the white mustard cultivar ‘Nakielska’, with a time-frame for growth for seeds, the plant growth period was significantly shortened and this had the effect of accelerating emergence and shortening rosette formation and budding. Conclusion. Vegetative development of white mustard grown for seeds sown from the beginning of April until mid-May proceeded at a systematically growing day length. Plants sown after mid-May until the first days of July came into the generative phase at ever shorter day length. The flowering of plants sown in mid-May proceeded at an average day length of 17 hours, whereas those sown at the beginning of July had an average day length of 14 hours.
Authors and Affiliations
Grażyna Harasimowicz-Hermann, Edward Wilczewski, Wioletta Kisielewska
Keywords
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