The article deals with the theoretical and practical analysis and evaluation of the impact of the fertilizers doses variety and tillage methods on the formation of standing crops density of winter wheat as one of the most important factors which, in combination with others, can have a positive impact on the value of the productivity, structure elements, products quality. In addition, crops density is an efficient way to regulate microbial processes in the soil as well as use of moisture, nutrition elements and sunlight by crops.

Varying crops density during the growing season can change its morphotype, height, forming vegetative and generative organs, agrophytocenoses density and, therefore, consumption of nutrients and water from the soil, photosynthesis, can be regulated which will result in and regulating the value of the yield.

Crops can respond to changing their density in two ways – in partial loss of the crop during the growing season, or change the nature of growth and development.

The study was conducted in 2011-2013, in a stationary field experiment at the experimental field of Bila Tserkva NAU. During the research quantitative and qualitative comparison methods were used as well as abstract-logical and analytical method.

The dynamics of the variability of the number of plants from emergemcy to ripening grain was studied in multivariate field experiment. Podolyanka, Yasochka and Bat’ko winter wheat varieties were taken the A factor varieties of winter wheat; fertilizers doses - for B factor and tillage methods - for C factor.

Determination of the number of plants that survived from emergemcy to maturation, including all variants of multivariate experiment showed that the 79.1% of plants kept clean in Yasochka variety, 81 % in Podolyanka variety, - on 85.1 % - in Bat’ko variety of the plants . In the process of growing under our technology 14.9-20.9 % of the plants died on average. The dead plants make irrevocable lost and unaccounted reserve of the grain yield.

We have determined the part of the contribution of each gradation multivariate of the multifactor experiment in density stand of plants formation per 1 m2 during grain ripening with the three factors dispersion analysis the amount of species variance. The analysis showed that the impact of the share of total variation accounted for 43.6 %. The unregulated factor made a significant impact here. A crucial role is probably played by the temperature of the air and soil, soil moisture, dry winds climate effects, pests and diseases. The rate experiment options in forming the number of plants per 1 m2 is 23.7 %.

Impact share of factor A ( genotypes varieties) in the formation of this index in the phase of full ripeness is 15.8 %, the share of B factor (doses of fertilizers ) is 10.4%, share of C factor influence (soil management) is 1.7 %. The share of the total impact of the factors interaction in the formation of plant density before harvesting is 4.7%. The share of the experiment controlled factors influence on the formation of standing plant density before harvesting is 51.7 % which is considered to a weak effect. We have the reserves to increase this share impact due to new, more drought-resistant, winter-hardy, pests and diseases varieties resistant. Due to agricultural practicesaimed at preserving soil moisture and application of effective, easily digestible, complex fertilizers

1. Plant density is influenced by the studied factors such as variety, fertilizers rates and cultivation methods.

2. Crops stand density in the communities depends on farming practices both human regulated and random unregulated.

3. The greatest influence in shaping the number of plants per 1 m2 depending on the development phase is made by emergemcy phase on the variety and fertilizers dosage, the impact on tillage methods is much lower.

4. While the tendency of variation in the crops density formation in the stages development remained, cultivation methods had nearly negligible effect on the density of plants standing.

Key words: crops density, cenosis, growth phase, the growing period, agrotechnical steps, wintering, earing, maturation, sort, fertilizers, tillage methods, dispersion analysis, share of influence.