Аnalysis of meteorological conditions during growing uterine beets showed changes in the region during the 1995-2011. The most arid were 1999, 2003, 2004 (especially in the first half of growing season) and 2007, too wet - 1995, 1997, 2005, 2006, other years - close to the average.

With the dry years the most typical growing season were 2007 and 2011. In 2007 precipitation amount was 74 mm, HTC - 0.6, aridity index - 1.31 during the "closing-sowing rows" period, and during the "closing of rows-harvesting" period – 143 mm, 0.9 and 0.92 respectively. Such meteorological conditions have generally negative affect on beet field agrophytocenoses and, in particular, uterine beets stairs density (field germination), their growth and development and uterine beets output. According to plants standing density of 78 thousand/ha, the average root mass was 291-308 g, uterine output – 46-47 thousand/ha in this year.

With the excessively wet years, the most characteristic in this respect was the 1995 growing season. Amount of precipitation during the "closing-seeding between rows" period was 219 mm, the average temperature - 13.8 0C, HTC - 1.7, aridity index - 0.50, during the "closing of rows-harvesting" period - 248 mm, 17 6 0C and 0.70 respectively. Such weather conditions have positive influence on beet growth and development and generally uterine output. According to plants standing density 190-195 thousand/ha, the average root mass was 320-330 g, uterine – 75-76 thousand/ha in this year.

Hydrothermal conditions analysis also showed that in one of 3 to 4 years a small precipitation amount during sowing (May) was accompanied by an air temperature increase, as shown HTC value - unit and the unit in region. Such conditions negatively affect on field seed germination, contribute plants significant falling out during the "stairs-closing rows" period and eventually to reduce COU. For example, in 2004,by HTC 1.0 during the "closing-sowing rows" period plant stand density before harvesting was 67 thousand/ha, the average root mass – 280-307 g, uterine – 41 thousand/ha, by HTC in this period from 1.7 (2005) - 110-115 thousand/ha, 290-293 g and 81-82 thousand/ha respectively.

It is established that on root mass variation significantly affect meteorological factors during the "closing-sowing rows" period. Moisture lack in the period of plant development leads to their growth delay: in dry years (1999, 2003, 2004, 2007), the average root mass ranged from 270-312 g, wet (1995, 1996, 1997, 2005, 2006) - 289-331 g.

The primary factor that determines root mass variation and its output is density. During 1995-2011 this index analysis showed that uterine beet stand density varies within wide limits: from 67 to 181 thousand/ha in dry years and from 110 to 222 thousand/ha in the wet. Root mass and uterine output was changed under this.

An observations resulted statistical analysis of uterine beet cultivation main indicators was showed that the difference between, for example, the uterine output is exists among different hydrothermal conditions. The correlation coefficient between the HTC, plants density and uterine output were 0.68 and 0.57 respectively.

COU was determined during the spring heaps opening. To do this three hundred root samples were selected which roots loss determined (unsuitable for planting). Final COU was calculated as the difference between the uterine output after harvesting and losses during storage at a rate of area stuffs planting of 70 x 35 cm (40.8 thousand/ha). Researches have shown that uterine roots output coefficient fluctuations depended on the hydrothermal conditions (radiation aridity index), the intensive growth period – from the leaves closing between the rows to harvesting period.

In most of years of roots storage typical conditions were observed COU clear decrease with aridity index increasing. In 1995 (excessively humid aridity index - 0.60) COU was 1.7, in 1996 - 0.92 and 1.8 respectively. In 1999 (arid, aridity index – 1.02) KCOU was 1.3, in 2003 - 1.11, 1.8 and 1.0 respectively.

However, this relationship was not straightforward. During the various roots storage conditions years, it had its quantitative differences. During 1995/96 - 2010/2011 extreme uterine storage conditions in the DP DG “Shevchenkivske” area was observed of three times: in winter 1997/98, 1998/99, 2006/07.

During uterine storage the weather was very warm in 1997/1998, 2009 /2010 (even this average temperature was positive during this period) roots microbiological processes strengthened and rot infestation increased. Roots loss were: in the 1997/98 year winter – 63,4-64,7% in 1998/1999 – 56,0-57,5% in 2006/2007 – 68.8 – 71.3%.

Key words: meteorological conditions, uterine, plants standing density, uterine output, root average mass, uterine output coefficient.