Efficiency of herbicides application on millet crops

The rational quality of nutrition is associated with the production of millet. High contamination and limited range of recommended herbicides are the limiting factors of crop cultivation. In this regard, studies have been conducted on finding the most promising selective herbicides relative of millet, given the species composition of weeds. To combat weed vegetation successfully, data are needed that are related to the species composition, critical periods and thresholds for damage to weeds in millet crops. Our research found that the presence of weeds in crops has a negative impact on the height of millet plants, length of panicle, weight of 1000 grains. Anexact decrease of the indices begins when there are 10-25 weeds/m2 in the crop. When the number of weeds are 10-15 PCs/m2 plant height compared with pure crops is reduced by 4-13%, 20-25 PCs/m2 - in 7-25%. If the infestation 10-15 pieces/m2 weight of 1000 grains is reduced by 3-13%, 20-25 PCs/m2 - 9-16%. We have determined the economic threshold of injuriousness (ETI) of weeds in crops of millet, which differed according to years of research and in 2013 was 10, in 2014 - less than 10, in 2015 - 10 weeds per 1 m2. Thus, the economic threshold of weeds in crops of millet is 10 PCs/m2. In adverse weather conditions for the development of millet (drought, frost, etc.), it decreases, and during intensive growth of the culture increases. The relative ratio of harmfulness of weed plants varies depending on the magnitude of the planned yield from 0.1 to 0.6%. The use of herbicides in terms of weed infestation of crops of millet should be in excess of the ETI that would be most efficiently, economically and would regulate the number of weeds in crops at a safe level.