Abstract
During the 2010–2012 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 late– spring cereal and legume mixture from maize and white lupine was performed. As variants the following periods of sowing (during 10 days) were studied: 1. 10–20 April (Standard); 2. 21–30 April; 3. 1–10 May; 4. 11–20 May. The most optimal sowing time of annual late–spring mixed crop from maize and white lupine grown under foothill conditions of the Central Balkan Mountains (Troyan region) is the period from 10 to 20 April. The received forage amounted to 2.53 t.ha green mass and 0.39 t.ha dry matter; while in the others later periods the yields were relatively low. A less weed infestation of the mixed crop was reported at the earlier periods of sowing.
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