| Summary: | Three-year field experiment with white mustard grown for seeds was carried out as a single factor experiment in the completely randomized block design with four replications. White mustard was sown at intervals of seven days, from the beginning of April until the turn of June and July, and harvested after reaching seed maturity. Sowings of white mustard after 10 May caused a decrease in seed yield from 38% to 79% (turn of June and July) in relation to the yield from sowing in the first ten days of April. Sowing delay by one day in relation to the common adopted date of 1 April resulted in a reduction in white mustard seed yield by 0.012 tons per hectare. White mustard gave a higher yield if its growing period was moderately long, precipitation amount was higher and the value of hydrothermal coefficient K slightly lower, and plant development took place in the season with a systematically increasing day length. Due to low plant density, number of seeds per silique and TSW, the seed yield of white mustard sown later than in the first half of June decreased permanently below the profitability limit.
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