EN | The challenges of using chalk when protecting your crops from intense sunlight @ValkHortiSystems
EN | The challenges of using chalk when protecting your crops from intense sunlight  @ValkHortiSystems
Uploaded October 2025 | Updated September 2026, 5 days ago
A sunny summer day, cloudy weather, or a humid morning. The weather is constantly shifting. For you as a grower, this means facing the ongoing challenge of creating the perfect greenhouse climate and ensuring optimal crop growth throughout the day. Many growers turn to chalk as a solution, but is it really the most effective way?

Chalking is a widely used method to protect crops from intense sunlight. However, this technique doesn’t provide the flexibility and climate control your greenhouse needs to achieve optimal crop growth. Chalking comes with several challenges, including:

- Fluctuations in light levels at crucial moments
- Difficulties in regulating heat
- Increased risk of humidity spikes and therefore fungal disease

These challenges have a significant impact on your crop development and yield. Discover the exact effects in the first video of our three-part series, where we take you on a journey toward the solution for your poly greenhouse, backed by scientific research.
EN | The challenges of using chalk when protecting your crops from intense sunlight
Van der Valk Horti Systems |

EN | The challenges of using chalk when protecting your crops from intense sunlight

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