Study of the possibility for twofold harvesting of annual late spring crops and mixtures in the foremountain regions of the Central Balkan mountains

During the 2007-2009 period in the Institute of Mountain Stockbreeding and Agriculture – Troyan a study was conducted on the possibility for twofold
harvesting of annual late spring crops and mixtures for production of forage. Three pure stands of grass and legume crops and 2 mixtures between them were
tested in the following variants: 1. Spring pea “Pleven 4”; 2. Sudangrass (Control); 3. Sorghum-Sudangrass hybrid; 4. Sudangrass + Spring pea; 5. SorghumSudangrass
hybrid + Spring pea.It was found that under initial harvesting at the time of earing/heading (1st stage) or at the beginning of flowering of grass crops
(2nd stage) the sorghum-Sudangrass hybrid and its mixture with spring pea was distinguished for the maximum productivity, exceeding the control stand of
Sudangrass by 55.03 and 51.98% and by 48.82 and 41.78%, respectively. At both stages after the first harvesting the yields from the second cut were formed by
the grass crops. Irrespective of the stage of initial harvesting and nature of the stands (pure or mixed), the sown forage crops occupied the greatest relative
portion in the areas, the mixed stands having the lowest weed infestation.

Study of the possibility for twofold harvesting of annual late spring crops and mixtures in the foremountain regions of the Central Balkan mountains

V. Lingorski1, T. Kertikov2