HERBICIDE APPLICATION TO OPTIMIZE PHYTOSANITARY SITUATION WITH SPRING WHEAT SOWINGS UNDER MINIMAL SOIL CULTIVATION CONDITIONS

Abstract

Research data are presented on selective herbicides applied to spring wheat sowings and nonselective ones that were applied pre-sown, after-harvested and with fallow fields prepared. To control the complex of weeds of different biological groups under the conditions of minimal soil cultivation with concurrent traditional selective herbicides applied during grain crops vegetation period the system to use chemical means of weed control is required which includes different dates of herbicides application (pre-sowing and after-harvesting) and combined preparations in tank mixtures. It is established that with the treatment during the vegetation the ethers 2.4-D and mixtures based on them are the most effective against root-propagating weeds (particularly willow spurge and field bindweed), but the treatment with herbicide-combined humus growth regulators gives rise to additional grain productivity gain. To control wintering and root-propagating weeds under the conditions of minimal soil cultivation it is necessary to apply herbicides including nonselective ones in winter period or in the fall. When preparing fallow fields to efficiently suppress root-propagating weeds one should substitute herbicides for mechanical cultivation.