Sensitivity to herbicides of two spring forage pea cultivars

. An important element of spring pea growing technology is weed control as the crop is highly sensitive to them, especially in the early stages of its development. The use of various herbicide preparations with a diverse mechanism and spectrum of action, changes in weed associations under the influence of various factors, as well as the selection of new varieties necessitates a constant study of the problem of the efficacy of herbicide preparations and the sensitivity of varieties to them. The aim of the present study was to investigate the sensitivity of two cultivars of spring forage pea to different herbicide preparations. During the period 2006-2008 in the village of Lyubenova mahala, Stara Zagora region, a three-factor field experiment was conducted by the fractional parcel method in four replications and size of the harvest plot 10m2. Factor A includes cultivars of spring peas, factor B – herbicide variants, factor C – doses of herbicides. It has been proven that the plants of both varieties, Pickardi and Amitie, are killed by 2.4 D, both in single and double dose. The highest average plant height was recorded in the Amitie cultivar treated with Basagran 600 SL herbicide at the double dose (3.0 L/ha). The highest were the values of the parameter number of beans per plant obtained in the Amitie cultivar treated with Basagran 600 SL and Pivot 100 SL – 0.8 L/ha, in the soil. A statistically proven highest average value of the parameter seed mass per plant was obtained in the Amitie variety treated with the Basagran 600 SL herbicide (12.667g) and the lowest – in Pickardi with the herbicide Pivot (10.330g).