The ante of different shoots systems in biological crop grain productivity of spring barley depending on seeding rates and foliar additional fertilizing.

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UDC 631.559: 633.11: 631.5.

A. Rozhkov, Candidate of Agricultural Sciences

S. Chernobay, postgraduate student

Kharkiv National Agrarian University named after V. V. Dokuchayev

The shoots share of different systems in biological crop productivity of spring barley seeds variety Monomakh depending upon the seeding rate and foliar fertilizing.
Complex assessment of separate elements of spring barley growing technology based on the analysis of the elements of the formation structure will improve crop production of this culture. In this regard, disclosure of the genetic potential of the crop productivity, the search for optimal seeding rates for them as well as the most effective ways of foliar fertilizing are urgent.
The purpose of the research was to determine complex influence of seeding rates and foliar fertilizing on the biological crop productivity of spring barley grain variety Monomakh and to identify the share of each system of shoots in its formation under the influence of the studied factors.
Field researches were conducted in the experimental field of the Plant Growing Chair of Kharkiv NAU named after V. V. Dokuchayev on the base of vapour grain row crop rotation during 2012-2014 according to the general accepted methods.
All the studied seeding rates provided a significant increase in grain crop productivity of plants main shoots system, while fluctuations of indices of crop productivity of lateral shoots system at the studied seeding rates was not significant.
Under the influence of seeding rate biological crop productivity of the main shoots varied in the range from 231.9 to 260.3 g / m2 (indices change swing – 12.2%), while the system of lateral shoots varied in the range from 47.0 to 49.8% (indices varied in the range of 6.0%).
Dominant role in the formation of the overall biological crop grain productivity belonged to the system of main plants shoots that is naturally explained by biologically conditioned feature of spring barley plants to form low overall and productive tillering. In the conducted experiments, the share of main shoots in the formation of the overall biological crop grain productivity on average at the studied factors in 2012, 2013 and 2014 was 82.7%, 82.8 and 84.7% appropriately.
Under the influence of seeding rates factor it was marked noticeable changes in the role of each shoots system in shaping of the overall biological crop grain productivity that were more pronounced in the more favorable weather conditions in 2012 and 2014. The tendency of increasing the role of the main shoots in the formation of the overall biological crop grain productivity on condition seeding rate increasing is the result of competition increase in crops which resulted in productive tillering and crop grain productivity of lateral shoots compared with shoots that belong to the system of main shoots decreases. The indices increase of the biological crop grain productivity under the influence of foliar fertilizing action was carried out by both shoots systems proportionally.
During the research it was determined the optimal seeding rate of spring barley – 5.0 million / ha which ensures the formation of the most biological crop grain productivity. Its influence is mostly through the main plants shoots. Seeding rates does not have any significant influence in terms of the biological crop productivity of lateral shoots system. There is a tendency to improve the indices by means of seeding rate optimizing. The complex of foliar fertilizing with Crystalon special and Reakom (dose – 1.5 kg / ha) with biopreparation agro EM promoted a significant increase in biological crop grain productivity due to both the system of main plant shoots and the system of lateral plant shoots.
Key words: seeding rate, foliar fertilizing, biopreparation, spring barley, biological crop grain productivity, complex chelated fertilizers.

A. Rozhkov, S. Chernobay. The ante of different shoots systems in biological crop grain productivity of spring barley depending on seeding rates and foliar additional fertilizing.

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