Agriculture and forestry

Pelekh Lyudmyla Victor – Candidate of Agricultural Sciences, Senior instructor of the department of agriculture, soil science and agricultural chemistry of the Vinnytsya National Agrarian University (m. Vinnytsia, street of Sonyachna, 3 е-mail: gogoluda69@gmail.com).

In the article the results of study of influence of level of impurit of sowing of a spring barley are reflected on forming of his productivity. Influence of weeds is described on forming of the productivity of this important agricultural culture. The results of different ideas are reflected in relation to the value of study of this question and his novelty and actuality.

The features of dynamics of forming of specific composition of weeds are certain both from position of their quantity and from position of structure. Conducted estimation of amount of weeds on registration areas depending on the climatic factors of vegetation.

The estimation of dynamic features of forming of abundantness of weeds is conducted in sowing of culture during a division into periods in a 15 twenty-four hours with the interval period of account a from 15 to 90 twenty-four hours after appearance of tails of culture, that gave an opportunity to study features as their inspecific growth so gravimetric. Such methodical approach of researches, in turn,

allowed to set stage-by-stage the decline of the productivity of a spring barley in the cut of the differentfull stages of forming of quantity of weeds.

The levels of decline of the productivity of a spring barley are certain taking into account the amount of weeds in different periods of height and development of plants of a spring barley. On the basis of what it is drawn the conclusion thet what stage is critical in relation to application of chemical measures of control of quantity of weeds in sowing of the barley.

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