Effect of chemical weed control on productivity of spring forage forage pea (Pisum sativum L.)
2008
Dimitrova, Ts., Institute of Forage Crops, Pleven (Bulgaria)
The study was conducted at the Institute of Forage crops - Pleven on slightly leached chernozem with a natural background of weed infestation during the 2006-2007 period. The objective of the study was to determine the effect of chemical control on weed infestation degree and productivity of spring forage pea. As a result of the study it was found that: Under the influence of competitive weed effect in the concrete conditions of this study the grain yield from spring forage pea was reduced by 27%; Under a mixed type of infestation with annual weeds the highest herbicidal efficacy (83-97%) was achieved by treatment with Diflufenican 500 g/l (Pelican 50SC) at the dose of 100 ml/ha a.i. after sowing before emergence in system with Propaquizafop 100 g/l (Agil 100 EC) at the dose of 80 ml/ha at the 3-5 leaf stage of pea and with Меtribuzin 700 g/kg (Zino 70WP) at the dose of 420 g/ha a.i. in combination with Propaquizafop 100 g/l (Аgil 100ЕC) - 80 ml/ha applied during vegetation at the same stage; The chemical weed control resulted in an increase of grain productivity of spring forage pea by 22 to 35%.
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