Woody plants seedlings irradiation lighting parameters by using LED transmitters in small-sized irradiation installations

Abstract

The use of planting material with a root-balled tree system is one of the promising directions for creating artificial plantations. It is associated with radical changes in the cultivation of planting material and significant changes in the forest crops production technology [1]. The technology of widespread, woody plants year-round cultivation in the artificial environment can be implemented by using small-sized forms of cultivation structures - irradiation chambers and cabinet units, grow boxes, phytotrons, etc. In this case, the main technological operation is the light regime necessary for plants: with the radiation spectrum necessary for their development and growth, with the required intensity and irradiation regime. The results of photobiological studies on the qualitative indicators of woody plants grown in phytotron conditions under irradiation by radiation with different proportions in the blue-red and blue-green-red ranges of the photosynthetically active radiation zones are presented. The photosynthetically active radiation spectral variants, providing the highest or extremely close to it productivity of the indicated crops, were established. The complex and ambiguous nature of the photosynthetically active radiation main spectral ranges influence on the photoenergy and photoregulatory processes in plants, which ensure their productivity, is indicated, which makes it impossible to determine the general unified requirements for the artificial irradiation optimal parameters for growing plants.

Water consumption of corn for grain depending on the predecessor and fertilizers used using strip-til technology

“…As ways to increase productivity, it is necessary to use combinations of fertilizers [6], the method and period of their application [7][8], and treat seeds before sowing with growth stimulants. Alternative ways to increase the quantitative indicators of germination of seeds of agricultural crops, stimulate the growth and development of plants and, as a result, safety, are pre-sowing treatment of seeds by electrophysical methods [9][10][11] such as electromagnetic fields of various frequencies and wavelengths, ultraviolet and infrared radiation, corona discharge currents, electric pulse fields, which are an alternative to the use of pesticides and are safe for the surrounding flora and fauna [12][13]. Conducted studies on the effect of pre-sowing treatment in an electric field on sunflower seeds confirm the hypothesis about an environmentally friendly way to increase crop yields.…”

Improving the conditioned qualities of sunflower seeds by pre-sowing treatment with a pulsed electric field

“…Minimal, additional costs can be avoided by replacing the application of fertilizers or growth stimulants with alternative options, pre-sowing seed treatment with electrophysical effects [9], which are environmentally friendly, do not pollute the environment. Enough experience of successful application in the pre-sowing treatment of seeds of agricultural plants with electromagnetic fields of various frequencies, a corona discharge field, an electrostatic field of alternating voltage, and electric pulse fields has been accumulated [10][11][12]. The undoubted advantages of these methods, of course, is the cheapness of processing, but there are also disadvantages that are a deterrent to industrial implementation, one of which is the need to conduct experiments and establish optimal parameters (intensity, time, frequency, pulse repetition period) for each crop, depending on physiological characteristics, these parameters may be different [13,14].…”