PLANTS DENSITY EFFECTS ON PHOTOSYNTHESIS PERFORMANCE OF SUGAR SORGO AGROPHYTOCENOSES
DOI:
https://doi.org/10.31548/dopovidi2017.03.010Keywords:
sugar sorghum, variety, hybrid, crops density, photosynthesis performanceAbstract
In the future, more and more attention will be paid to finding ways to use biofuels - renewable energy stored by plants through photosynthesis. We can cover approximately 10% of all the energy with the photosynthesis products in the near future.
The aim of research was to determine the optimal plants density of sugar sorghum Sylosne 42 variety and Medoviy hybrid, to prove their impact on agrophytocenoses photosynthesis performance under conditions of the Central Steppes of Ukraine.
The research was conducted in 2010-2012 in the fluctuating humidity area in Bila Tserkva experimental breeding station of the Institute of Crops Bioenergy and Sugar Beet of NAAS using the method of systematic repetitions, the experiment variations are located in areas one after another in each repetition with quadruple repetition of the experiment.
The article presents the results of research on the influence of sugar sorghum crops density on Sylosne 42 variety and Medoviy hybrid photosynthetic performance under conditions of the Central Steppes of Ukraine. In particular, the research presents the data on the assimilation leaf surface area in the crops, photosynthesis performance, net productivity of photosynthesis as well as data on dispersion analysis. It is noted that the maximum assimilation surface area was obtained under sowing with row spacing of 30 cm and made 48.7-57.8 thousand m2 in Sylosne 42 variety and 58.0-66.1 thousand. m2 in Medoviy hybrid . For crops density of 300 thousand pcs. per hectare and rows spacing of 30 cm, the net productivity of photosynthesis was 3.26-3.70 g / m2 per day in Sylosne 42 variety and 3.51-3.96 g / m2 per day Medoviy hybrid.
Conclusions. It has been found that highest photosynthesis efficiency in Sylosne 42 variety and Medoviy hybrid was obtained under the crop density of 300 thousand pcs. per hectare and rows width of 30 cm.
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