<p>Greenhouse cultivation has become an essential component of modern agriculture, particularly for off-season vegetable production. However, the long-term intensive use of greenhouse systems can significantly alter soil chemical properties and fertility status. This study investigated the influence of investment duration (5, 10, 20, and 25&#xa0;years) on the degradation of soil chemical and fertility properties in greenhouses located in Jableh, Lattakia Governorate, Syria, and examined the accumulation of nitrate and nitrite in <i>Cucumis sativus</i> L. plants grown in these soils. Soil samples were collected from two depths (0–20&#xa0;cm and 20–40&#xa0;cm) and analyzed for pH, electrical conductivity (EC), organic matter (OM), total nitrogen (TN), nitrate, and available micro-elements (Fe, Mn, Cu, Zn). Plant samples were also analyzed for TN, nitrate, and nitrite contents. The results showed a consistent increase in soil salinity, micro-element concentrations, and nitrate levels with longer investment periods, alongside a significant decrease in soil pH. Cucumber plants grown in older greenhouses exhibited elevated levels of TN, nitrate, and nitrite, often surpassing recommended safety thresholds. Strong correlations were identified between investment duration and all studied soil and plant parameters. These findings highlight the critical need for implementing sustainable nutrient management strategies in greenhouse farming to prevent long-term soil degradation and potential health risks from vegetable contamination.</p>

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Influence of greenhouse duration on soil fertility and nitrate/nitrite in Cucumis sativus L.

  • Hiba Salman,
  • Abd Al Karim Jaafar,
  • Suleiman Salim,
  • Vishnu D. Rajput,
  • Zaryab Khan

摘要

Greenhouse cultivation has become an essential component of modern agriculture, particularly for off-season vegetable production. However, the long-term intensive use of greenhouse systems can significantly alter soil chemical properties and fertility status. This study investigated the influence of investment duration (5, 10, 20, and 25 years) on the degradation of soil chemical and fertility properties in greenhouses located in Jableh, Lattakia Governorate, Syria, and examined the accumulation of nitrate and nitrite in Cucumis sativus L. plants grown in these soils. Soil samples were collected from two depths (0–20 cm and 20–40 cm) and analyzed for pH, electrical conductivity (EC), organic matter (OM), total nitrogen (TN), nitrate, and available micro-elements (Fe, Mn, Cu, Zn). Plant samples were also analyzed for TN, nitrate, and nitrite contents. The results showed a consistent increase in soil salinity, micro-element concentrations, and nitrate levels with longer investment periods, alongside a significant decrease in soil pH. Cucumber plants grown in older greenhouses exhibited elevated levels of TN, nitrate, and nitrite, often surpassing recommended safety thresholds. Strong correlations were identified between investment duration and all studied soil and plant parameters. These findings highlight the critical need for implementing sustainable nutrient management strategies in greenhouse farming to prevent long-term soil degradation and potential health risks from vegetable contamination.