Automatic control system for the supply of nutrient solution in greenhouses

Authors

  • O. Sinyavsky National University of Life and Environmental Sciences of Ukraine image/svg+xml
  • V. Savchenko National University of Life and Environmental Sciences of Ukraine image/svg+xml
  • N. Solomko Nizhyn Agricultural College , ВП НУБіП України «Ніжинський фаховий коледж»
  • M. Oleshko Nizhyn Agricultural College , ВП НУБіП України «Ніжинський фаховий коледж»

DOI:

https://doi.org/10.31548/energiya4(74).2024.056

Abstract

Currently, small-volume hydroponics is widely used in indoor vegetable production. Growing plants on mineral wool substrates using a drip irrigation system has become the most widespread.

With this technology, it is necessary to maintain the humidity of the substrate at the optimal level for each culture. For this, software control of nutrient solution supply is currently used, which does not ensure the regime of mineral nutrition of plants at an optimal level.

Losses of nutrient solution when using the most advanced drip irrigation system reach at least 25 %

The purpose of the study was to develop a system for automatic control of the supply of nutrient solution in greenhouses.

To achieve the goal, a functional scheme for automatic regulation of mineral wool humidity was developed and the transfer functions of each of its links were determined.

It was established that the relay-pulse law of automatic regulation is the most acceptable.

As a quality indicator in the optimization of the system of automatic regulation of mineral wool humidity, the total quadratic deviation was adopted, which made it possible to determine the duration of the pulse and the period of quantization according to the time of the regulator. For a greenhouse with an area of 1 ha, the pulse duration is 111 s, the time quantization interval is 666 s. These regulator parameters ensure absolute stability of the system.

The developed automatic regulation system ensures the maintenance of mineral wool humidity at the specified level with an error that does not exceed 5 %.

Key words: low-volume hydroponics, mineral wool moisture, automatic control, relay-pulse regulator

References

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DOI: 10.5772/intechopen.90438. Available at: https://www.intechopen.com/chapters/7066

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Syniavskyi, O. Yu, Savchenko, V. V. (2016). Avtomatychne keruvania mineralnym zhyvlenniam roslyn u hidroponnykh teplytsiakh [Automatic control for mineral nutrition of plants in hydroponic greenhouses]. Kyiv: KOMPRYNT, 249.

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Published

2024-12-08

Issue

No. 4 (2024)

Section

Статті

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