How to control seedling stretching in the nursery

Seedling stretching is a common issue in nurseries and can compromise transplant quality and final crop yield. Stretched seedlings appear excessively elongated, with thin, weaker stems, and are more sensitive to environmental and mechanical stress.

To obtain compact, strong, and uniform seedlings, it is essential to adopt targeted agronomic techniques:

1

Light management

The use of blue filters or covering materials that increase the red to far-red ratio (R/FR) helps reduce stretching, promoting more balanced growth.
2

Reduction of planting density

Excessively high sowing density causes plants to compete for light, leading to internode elongation. Reducing the number of seedlings per square meter or arranging them in a staggered layout helps control the problem.
3

Ventilation and temperature

Proper ventilation and correct control of the greenhouse temperature regime are essential. Excessive temperatures and poor air circulation promote stretching, while a more stable and well-ventilated environment helps maintain compact seedlings.
4

Irrigation

It is advisable to irrigate during the day and keep plants dry at night, especially in winter. Proper water management reduces water accumulation in plant tissues and limits elongation.
5

Nutrition

Limiting excess ammoniacal nitrogen and phosphorus, while ensuring a balanced calcium supply, helps produce stronger plants with more consistent tissues.
6

Substrate structure

The use of substrates with a good percentage of white peat (60–70%) and inert materials such as perlite or vermiculite improves aeration and promotes root development—key factors for seedling compactness.

Atlantic Man. solutions for the nursery sector

Agronomic techniques to control seedling stretching achieve their full potential when supported by efficient and automated nursery management.
Atlantic Man. nursery technologies include machines for substrate preparation, seeding lines, automated irrigation systems, transplanting and handling systems, as well as solutions for container washing and disinfection.

Thanks to these integrated solutions, it is possible to:

  • ensure uniformity and precision at every stage of the process;
  • optimize planting density and substrate management;
  • reduce and control excess moisture;
  • improve aeration and root development of seedlings.

Intelligent mechanization helps improve the quality of daily nursery operations and enables the production of healthier, more resilient seedlings, minimizing stretching.

Atlantic Man., innovation at the service of nurseries

With over thirty years of experience in the sector, Atlantic Man. supports nursery professionals with reliable, modular, and tailor-made solutions. Contact us to find out how we can help you improve the quality and efficiency of your production.

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