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Wheat (Triticum spp.) is a cereal that is cultivated worldwide. It is the most important human food grain (Hanee M. Al-Dmoor, 2008). Traditionally, herbicides in winter wheat are applied from two leaf stage till the end of tillering (Triasulphuron Logran) and in spring at tillering (Propoxycarbazone-sodium Atribut, Sulphosulphuron Monitor, Iodosulphuron-methylsodium Husar) and from tillering till booting (Florasulam + 2.4-D 2-ethylhexyl ester Mustang). Atribut, Monitor and Husar best fit for control of annual monocotyledonous weeds as Apera spica-venti, Avena fatua, Poa pratensis etc. and some annual dicotyledonous weeds as Galium aparine, Tripleurospermum perforatum, Viola spp., Lamium spp. etc. Logran best fits for control of annual dicotyledonous weeds as Sinapis spp., Capsella bursa-pastoris, Thlaspi arvense and etc. while Mustang is designed for control of dicotyledonous weeds as Chenopodium album, Centaurea cyanus, Myosotis arvensis, Sonchus arvensis, Cirsium arvense and others (Rimavicienė, 2005). Appropriate selected and in time applied herbicides destroy spreading weeds in crop or suppress weed growth and new seed production. Crop weediness is considerably reduced when soil is adequately cultivated, herbicides are applied and crop rotations are practiced (Barberi et al., 1997). It was determined that the field crops of cultured plants are plant associations or so called agrophytocenoses, and that the total biomass of a crop stand (crop and weed biomass) is more or less constant and that the crop yield is inversely proportional to the weed biomass (Lazauskas, 1990, 1993). Effectiveness of chemical weed control is determined by three main specifications: selection of an adequate herbicide, its optimal norm and duration of application. In the process of weed control it should be remembered that wet climate, cold spring weather, long autumn are the factors that help them grow and develop. Another important factor is the ratio of weed biological groups. The prevailing weeds in Lithuania are short-lived annual dicotyledons that comprise 70-90% of all the weeds (Pilipavicius, 2005). Many annual weeds successfully survive till spring because of climate warming; however, they were naturally frozen during winter time just 10-15 years ago. Global warming is the increase in the average temperature of the Earth's near-surface air and the oceans since the mid-twentieth century and its projected continuation. Including uncertainties in future greenhouse gas concentrations and climate sensitivity, the IPCC, scientific intergovernmental body set up by the World Meteorological Organization (WMO) and by the

Herbicides in Winter Wheat of Early Growth Stages Enhance Crop Productivity