Abstract
During the 2011–2012 periods 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 early–spring cereal–legume mixture from oats and field pea was performed. As variants the following periods of sowing were studied: 1. 10–20 March (Standard); 2. 21–30 March; 3. 1– 10 April; 4. 11–20 April. It was established that the optimum time for sowing of annual early spring pea and spring oats mixed crop was the period from 10 to 20 March. Then was received most plant production (1.84 t.ha green mass and 0.41 t.ha dry matter), which exceeded the other sowing periods from 7.07% (21–30 March) to 27.72% (11–20 April) and from 1.6 to 8.13%, respectively. In the different sowing times the weed infestation of crops varied and was a highest in early spring sowing (10–20 March)–from 8.40 to 9.26%.
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