Tomato Transplant Age: A Review

@article{Vavrina1993TomatoTA,
  title={Tomato Transplant Age: A Review},
  author={Charles S. Vavrina and Michael D. Orzolek},
  journal={Horttechnology},
  year={1993},
  volume={3},
  pages={313-316}
}
As early as 1929, university scientists began the quest to determine the ideal age at which to transplant tomatoes (Lycopersicon esculentum Mill.). Investigations have included seedlings of 2 to 15 weeks of age produced in wood, peat, plastic, or Styrofoam containers. Early researchers often omitted descriptions of soil mixes and nutrient regimes, and used a wide variety of container types. Later investigators were inclined to use commercial soilless mixes, well-defined nutrient regimes, and… 
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396-403 J2_201900044.fm
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References

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GROWTH AND YIELD OF TOMATO PLANTS IN RESPONSE TO AGE OF TRANSPLANTS
TLDR
Results indicate that no improvement in yields was obtained using the traditional older transplants, and younger transplants might be used to achieve rapid seedling estab- lishment with-minimal transplant production costs.
Tomato transplant morphology affected by handling and storage
Shoot and root growth changes in response to handling and storage time in 'Sunny' tomato (Lycopersicon esculentum Mill.) transplants were investigated. Trans- plants, 45 days old, were stored either
Transplant age and N and P nutrition effects on growth and yield of tomatoes
TLDR
Plants fertilized with moderate and high N levels in the greenhouse produced larger early yields in the filed, but there was no effect of N or P level applied inThe greenhouse on total yield.
TOMATO SEEDLING GROWTH, EARLINESS, YIELD, AND QUALITY FOLLOWING PRETRANSPLANT NUTRITIONAL CONDITIONING AND LOW TEMPERATURES
TLDR
This data indicates that a PNC regime combining at least 200 mg N/liter and up to 10 mg P/liter should be used to nutritionally condition 'Sunny' tomato seedlings to enhance yield.
Effect of Transplant Age on Tomato Production