CONSERVING OF THE RESOURCES

The irrigation regime of tomatoes grown in glass unheated greenhouses using an ecological and water-saving irrigation technique

  • 1 Institute of Soil Science, Agrotechnology and Plant Protection “Nikola Poushkarov” – Sofia
  • 2 Institute of Vegetable Crops "Maritsa“, Plovdiv

Abstract

The research was conducted to determine the irrigation regime of greenhouse tomatoes in 2022 on the MVCRI- Plovdiv experimental field in an unheated steel-glass greenhouse of the Venlo type. The experiment was carried out in three irrigation modes: optimal, reduced, and increased, respectively – 100%, 75%, and 125% using water-saving technology.
The size of the irrigation norms has been determined, i.e., the number of waterings for the growing season and their distribution by phases of development for soil and climatic conditions of the Plovdiv region.
The results obtained for irrigation of the greenhouse tomatoes show that 18 waterings were implemented for the growing season to maintain the soil humidity between 85-100% of the MFMC for the conditions of Plovdiv from the beginning of May to the end of July. The size of irrigation norms by modes varies from 14.9 to 24.7 mm, and irrigation from 268 to 447 mm. The maximum irrigation rates during the most significant water consumption period can be applied in 3-4 days and satisfy the needs of the plants. The obtained results are the basis for determining the design irrigation regime and predicting the culture’s irrigation time.

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