The optimal nitrogen thresholds under different irrigation levels are not well understood

The gap

Evidence profile

Sourced from the stated research gap and future-work section and abstract of the source papers, classified as general, drawn from work published between 2024 and 2026, spanning 5 journals. Those papers have been cited 51 times in total.

Supporting evidence — 8 representative gaps

• Reduced irrigation decreases the optimal nitrogen threshold of greenhouse tomatoes by altering gas exchange and stomatal morphology (2026) · Frontiers in Plant Science · doi

  The optimal nitrogen thresholds under different irrigation levels are not well understood. The interactive effects of water and nitrogen on tomato photosynthetic physiological characteristics are not well understood.

  generalstated research gapevidence 5/5
  Keywords: optimal nitrogen thresholds different irrigation levels well understood
• Synergistic effects of Arbuscular mycorrhizal fungi and silicon on greenhouse tomato under drought stress across irrigation regimes (2026) · Scientific Reports · doi

  The combined effects of AMF and Si under different irrigation regimes in greenhouse tomato remain insufficiently quantified. There is a need to evaluate the effects of AMF inoculation and Si application on yield, fruit quality parameters, and leaf nutrient composition.

  generalstated research gapevidence 5/5
  Keywords: combined effects amf different irrigation regimes greenhouse tomato
• Optimal Irrigation and Fertilization Enhanced Tomato Yield and Water and Nitrogen Productivities by Increasing Rhizosphere Microbial Nitrogen Fixation (2024) · Agronomy · cited 11× · doi

  Investigate the effects of optimal irrigation and nitrogen application on tomato growth and yield in different climates and soil types. Examine the long-term effects of optimal irrigation and nitrogen application on tomato growth and yield. Explore the potential of using other nitrogen application rates and irrigation levels to further optimize tomato growth and yield.

  generalfuture-work sectionevidence 5/5
  Keywords: investigate effects optimal irrigation nitrogen application tomato growth
• Effects of Irrigation Interval and Irrigation Level on Growth, Photosynthesis, Fruit Yield, Quality, and Water-Nitrogen Use Efficiency of Drip-Fertigated Greenhouse Tomatoes (Solanum lycopersicum L.) (2025) · Agronomy · cited 13× · doi

  While the impact of irrigation level on tomato growth and yield has been extensively studied, irrigation interval, another crucial component of irrigation schedule, as well as their interaction, remain poorly explored.

  generalabstractevidence 4/5
  Keywords: irrigation impact level tomato growth yield extensively studied interval crucial component schedule well interaction remain
• Optimal Irrigation and Fertilization Enhanced Tomato Yield and Water and Nitrogen Productivities by Increasing Rhizosphere Microbial Nitrogen Fixation (2024) · Agronomy · cited 11× · doi

  Irrigation and nitrogen application rates have significant effects on greenhouse tomato yields, as well as water and nitrogen use efficiencies, but little is known regarding how these rates affect plant–microbiome interactions and how the associated changes might impact tomato yields.

  generalabstractevidence 4/5
  Keywords: nitrogen rates tomato yields irrigation application significant effects greenhouse well water efficiencies little known regarding
• Effects of Irrigation Interval and Irrigation Level on Growth, Photosynthesis, Fruit Yield, Quality, and Water-Nitrogen Use Efficiency of Drip-Fertigated Greenhouse Tomatoes (Solanum lycopersicum L.) (2025) · Agronomy · cited 13× · doi

  Further research is needed to explore the effects of different irrigation strategies on tomato growth and yield in various climates and soil types. Studies could investigate the impact of irrigation intervals and levels on other crop species. Research could focus on developing more efficient irrigation systems and management practices for greenhouse tomato production.

  generalfuture-work sectionevidence 4/5
  Keywords: further research needed explore effects different irrigation strategies
• Pengaruh Media Tanam dan Dosis Pupuk Kandang Sapi Terhadap Pertumbuhan dan Hasil Tanaman Tomat (Solanum lycopersicum L.) (2026) · Jurnal Agroqua: Media Informasi Agronomi dan Budidaya Perairan · doi

  There is a need to determine the best dose of cow manure and planting medium for tomato plant growth and yield. The effect of planting medium and cow manure dose on the growth and yield of tomato plants is not well understood.

  generalstated research gapevidence 3/5
  Keywords: there need determine best dose cow manure planting
• The Effect of Mulching on the Root Growth of Greenhouse Tomatoes Under Different Drip Irrigation Volumes and Its Distribution Model (2025) · Horticulturae · cited 3× · doi

  The influence mechanism of covering conditions on the root distribution of greenhouse crops remains unclear. The relationship between the volume of drip irrigation water and the growth of tomato roots under mulching conditions is not entirely clear.

  generalstated research gapevidence 3/5
  Keywords: influence mechanism covering conditions root distribution greenhouse crops

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