Abstract
During the 2011–2012 period in the Research Institute of Mountain Stockbreeding and Agriculture (RIMSA) in Troyan (Bulgaria) the effect of sowing time on some bio–productive indicators (green mass and dry matter yields, weed infestation) of the forage from annual winter cereal and legume mixture of winter barley and winter pea was performed. As variants the following sowing periods carried out during 10 days were studied: 1. 20–30 September (Standard); 2. 1– 10 October; 3. 11–20 October; 4. 21–30 October. It was established that the most optimal time for sowing of mixed crop grown under foothill conditions of the Central Balkan Mountains (Troyan region) is the period from 1 to 20 October. The received forage amounted to 2.38 t.ha green mass and 0.59 t.ha dry mass, which exceeded the standard sowing period (20–30 September) with 25.26% and 59.46%, respectively. Irrespective of the autumn sowing period, weed infestation of the crop of winter cereal–legume mixture was comparatively low, ranging from 0.74 to 4.88%.
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