Abstract
The field experiment was carried out on the podsolic soil made from slightly loamy sand (weak rye complex) in the years 2003–2004. There were two factors in the experimental scheme: I. kind of crop (main and second), II. Seeding rate (60, 80 i 100 kg . ha -1). In the main crop buckwheat was cultivated in the site after a mixture of grain crops (oat + spring barley + spring wheat), whereas in the second crop in the site winter inter crop as winter rye. Buckwheat Hruszowska was cultivated at two sowing dates: 20 May in the main crop and 30 May in the second crop. The yield of nutlets and straw, the number of plants per 1m2 after emergences and before harvest, the number and weight of normally developed nutlets and unfilled on the plant as well as a thousand nutlets weight of buckwheat were investigated. It was proven that the yield of nutlets of buckwheat depended exclusively on the cultivation place and reached 0.99 t ha-1 in the main crop and it was higher by 70% than in the second crop. The most favourable effect on the value of the rest of the resulting feature with an exception to the thousand nutlets weight has the sowing of 60 kg and next the cultivation of buckwheat in the main crop. A thousand nutlets weight was formed mainly under the influence of the years of study.
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