HERBOLOGIA - anubih

Herbologia Vol. 7, No. 1, 2006.
INFLUENCE OF THE ADJUVANT DESH ON THE EFFICACY AND
SELECTIVITY OF IMAZAMOX 40 a.i.L -1 (PULSAR 40) IN THREE
PERENNIAL LEGUME CROPS
Tsvetanka Dimitrova 1 , Senka Milanova 2
1 Institute of Forage Crops, 5800 Pleven ifc@el-soft.com
2 Institute of Plant Protection, 2230 Kostinbrod protection@infotel.bg
Abstract
During the period 2003-2005 a study was conducted on slightly
leached chernozem with the purpose of studying the influence of the adjuvant
Desh on the efficacy and selectivity of Imazamox 49 a.i.L -1 (Pulsar 40) in
lucerne (Medicago sativa L.), birdsfoot trefoil (Lotus corniculatus L.) and
sainfoin (Onobrychis vicifolia Scop.). It was found that:
The herbicide Imazamox 40 a.i.L -1 (Pulsar 40) at the rate of 20 ml
a.i.ha -1 in combination with the adjuvant Desh – 1000 ml a.i. ha -1 applied in
early growing season of lucerne, birdsfoot trefoil and sainfoin had high
selectivity and herbicidal efficacity reaching 93-97%;
Treatment of swards of perennial legume crops improved their
botanical composition and increased dry biomass productivity 1.4 to 2.8
times.
Key words: Imazamox 40 a.i.L -1 , adjuvant Desh, weeds, productivity, perennial legume
crops.
Introduction
Economic importance of the perennial legume crops including lucerne
(Medicago sativa L.), birdsfoot trefoil (Lotus corniculatus L.) and sainfoin
(Onobrychis vicifolia Scop.) is many-sided. They are valuable for the high
biological value of their forage, as well as in an ecological aspect improving
soil fertility and phytosanitary state.
Weed competition is one of the main factors causing quick thinning
of the swards of these species, reducing and worsening quality of their
production. This circumstance is of decisive importance for weed control
during the period after establishment of the stands of these herbaceous
species.
Although the chemical method of controlling weeds in the swards of the
above-mentioned species is considered efficient by some authors, the studies
are limited in this field (Benkov & Prodanov, 1975; Dimitrova, 1987 and
1995; Lescar Audy, 1971).
The out-of-vegetation treatment of lucerne with Imazethapyr 100