EVALUATING EFFECTIVENESS OF HERBICIDES ON OLD-AGED PERENNIAL HERBAGES IN SAKHALIN

Abstract

Results are given from an investigation into application of herbicides on perennial grasses cultivated under conditions of monsoon climate in Sakhalin. To carry out scientific-production experiment on 15-year-old perennial grasses, there was applied Magnum, pure (10 g/ha) and in tank mixtures with Herbitox (0.6 l/ha) and Dialen Super (0.4 l/ha), against the background of water-soluble complex mineral fertilizer Aquarin-5 in a dose of 1.5 kg/ha. Weed plants were represented by field buttercup, orange-red hawkweed, yellow bedstraw, dandelion, germander speedwell (144 pieces per square metre on the average). It was found that the application of Magnum, pure and in tank mixtures, significantly reduces infestation of old-aged herbages. The maximum effectiveness of 91% in weed control was reached, when the tank mixture of Magnum and Dialen Super was used. With that, green mass yields of perennial grasses increased by 8.1 centners per ha. In the variants with herbicides applied, feed mass of perennial grasses was observed to contain less ash by 0.6-1.2%, sugars by 1.1-1.8%, fiber by 2.1-4.1%, nitrates by 31-54 mg/kg and more carotene by 2.1-6.3 mg/kg as compared with the control.