Regulation and developmentof Brassica oleracea plants growth with the help of sunlight correction.

Now scientists study the agriculture technologies that increase plants productivity and regulate their vital activity. It is especially crucial for food crops. In agricultural practice there has been recently found application of fluorescent films luminescent in the spectrum red area due to UV radiation absorption by luminophor loaded into their structure. The optimum size of solar radiation correction for optimization of plants development is not investigated. Search of action mechanisms of the mixed light stream on plants is of interest. In this connection, the purpose of research was studying influence of solar radiation correction on growth and development of an agricultural crop of cabbage.In the experiment we studid the influence of solar radiation correction on growth and development of Brassica oleracea L. plants Tochka variety depending on the type of used fluorescent films. Experimental films differed in spectrum, intensity and luminescence stability, which were defined by type and quantity of inserted luminophor. We applied fluorescent films luminescent in spectrum red area with maxima in wavelengths 615 nm and 626 nm and radiation intensity in the range from 3,9 to 20,6 relative units.As a control we used plants growing under a not modified film. Growing energy of sprouts, linear and quantitative growth parameters and biomass accumulation were estimated. The content of photosynthetic pigments was defined by a spectrophotometric method. The analysis of growth and biochemical parameters of plants was carried out during vegetation period after 20-35 days. Production process of plants was substantially determined by the intensity of photosynthesis. First of all, it's the formation of photosynthetic apparatus itself (leaves area, amount of the leaf mesophill cells and content of photosynthetic pigments), secИ.ondly - productivity of photosynthesis (dry weight, net productivity of photosynthesis). Biomass accumulation occurred at the expense of substances synthesized in the process of cell division, shoot expansion and increase in the number of storeys. In the process of the experiment a stimulatory action of red light on expansion of leaves surface and stem, content of chlorophyll a was found. Red light promoted development of cabbage plants and increased their dry weight. The increase in luminescent radiation intensity with wavelength 615 nm and 626 nm accordingly to 17,6 and 20,6 relative units (films Ф-10 and Ф-16) resulted in an increase of Chl a and carotenoid level in counting on thousand cells of a young leaf of the second storey. In the process of leaf growth the pigment-stimulating effect of more short-wave luminescent radiation (615 nm) remained. The reduction of the part of short- and long-wave UV radiation in total solar flux (films Ф-13 and Ф-8) caused active synthesis of photosynthetic pigments in the young leaf and cell division in the process of leaf growth. The obtained data allow recommending F-10fluorescent film for increasing productivity of Brassica oleracea L. plants Tochka variety.

Keywords

Authors

References