OVERWINTERING AND YIELD OF WINTER CULTIVARS OF FIELD PEA ASSAS AND WHITE LUPINE ORUS

摘要

Two-way field experiment was set up in a randomized block design in four growing seasons: 2011/2012, 2012/2013, 2013/2014 and 2014/2015. Five methods were used when sowing winter cultivars of field pea Assas and white lupine Orus, as well as 5 methods of plant protection against stress conditions in the period of winter dormancy, mainly low temperature (only field pea). Both species were sown on three dates – the beginning of the third decade of September, the end of the first decade, and beginning of the third decade of October. In the season of 2011/2012, no plants of both these species were found after overwintering. In other seasons, the average winter pea density in spring was from 42.5 to 84.5 plants per 1 m~(2). The studied methods of sowing and protecting plants of field pea did not also cause any significant increase in the level of plants’ winter survival. With quite favourable thermal conditions in winter season, seed yield of winter field pea Assas does not constitute competition for the constantly higher yielding spring forms of this species. White lupine was definitely more sensitive to a low temperature in winter season- plants overwintered only once with a satisfactory yield after sowing the seeds into white mustard or into stubble mulch.