Greenhouse microclimate control

Abstract

Extensive data have been accumulated indicating that for the regions of the Far North, the most effective are opaque greenhouses with enclosing structures of sufficiently high resistance to heat transfer, providing for the cultivation of plants under artificial or joint (semi-opaque greenhouses) lighting. From 1 m of such structures, you can get 140 … 300 kg of vegetables per year. To maintain a certain air temperature in greenhouses, mainly two heating systems are used: water and air. Extensive data have been accumulated indicating that for the regions of the Far North, the most effective are opaque greenhouses with enclosing structures of sufficiently high resistance to heat transfer, providing for the cultivation of plants under artificial or joint (semi-opaque greenhouses) lighting. From 1 m of such facilities, you can get 140 … 300 kg of vegetables per year. When growing plants in cultivation rooms in winter and spring, it is necessary to artificially maintain climatic factors affecting the growth and development of plants. In this regard, the automatic regulation of these factors in accordance with the requirements of agricultural technology is of great importance. To automatically maintain the temperature in greenhouses, a two-position control system is used. Large-scale greenhouse production is currently developing along the path of introducing technologies for intensive cultivation of vegetable crops and the use of automated control systems for technological processes based on micro- and mini-computers. One of the important technological processes is watering and feeding plants with mineral fertilizers. The need to automate this process is associated with the laboriousness of the process of preparing solutions, accurately maintaining a given concentration of substances in them, timely supply and uniform dosing over the entire area of the greenhouse under various disturbances of the external environment.

A simple wall in front of the greenhouses

“…With regard to the evolution of sprouts, there was greater sprouting in the greenhouse in coriander (42), lettuce (24) and cabbage ( 22), in descending order respectively, and less in the extreme cold environments in all cases. It should be noted that in the last stage of cultivation the number of sprouts increases signi cantly (Kokieva et al, 2020;Romnée et al, 2019).…”

“…The problem is visualised with technologies for thermal, luminescent and humidity control (Kavga et al, 2020;Kokieva et al, 2020) as thermo-physical parameters (Du et al, 2021;Fan et al, 2021) and infrastructure designs (Yang, 2021) including Internet of Things technology (Han et al, 2018). To these technologies can be added studies of the effects of wind shear by high but low-cost constructions (Jani et al, 2021;Li et al, 2018).…”