Can Low-Chill Varieties Aid Fossil-Free Strawberry Cultivation?

The greenhouse horticulture sector and the government aim to achieve fossil-free cultivation by 2040. To reach this goal, two key strategies are essential: identifying alternative energy sources and reducing energy consumption. Wageningen University & Research BU Glastuinbouw is exploring the potential of low-chill strawberries to optimize climate strategies and lower energy usage. Researcher Johanna Bac-Molenaar emphasizes, “Energy savings are certainly achievable with low-chill strawberry cultivation.”

Traditional year-round illuminated strawberry cultivation consumes significant energy during the growing season. In contrast, unilluminated low-chill cultivation primarily requires energy during the first three months, when plants are developing and clusters are maturing in tray fields. WUR studied two varieties, Inspire and Fandango, focusing on minimizing energy and CO2 inputs.

In the experiment, greenhouse ventilation was reduced at the end of the day to allow temperatures to drop gradually, aided by closed transparent energy screens and aluminum curtains. These screens, combined with active dehumidification, created a stable daytime climate by retaining heat when needed.

Promising Results with Challenges

The research demonstrated good production results with substantial energy savings. However, mildew pressure increased in summer due to frequent ventilation and higher humidity levels during moist nights.

Bac-Molenaar notes, “While energy savings are achievable, intensive use of energy screens during dark months can limit light, slowing crop development. CO2 dosing near the plant is only effective locally when ventilation is open. Shortening daylight hours can extend cluster induction, provided daily temperatures remain moderate.”

This research, part of the Kas als Energiebron project, received financial support from the Strawberry Research Foundation and sponsorship from Ludvig Svensson.

Credits: Wageningen University and Research, published November 7, 2024

A Step Toward Sustainable Strawberry Cultivation

The findings from Wageningen University & Research highlight the potential of low-chill strawberry varieties to revolutionize energy-efficient and sustainable cultivation. By adopting strategies such as optimizing ventilation, utilizing advanced energy screens, and leveraging low-chill varieties like Inspire and Fandango, growers can significantly reduce energy and CO2 consumption.

Although challenges like mildew pressure and light limitations remain, this research underscores the importance of innovative approaches in achieving the greenhouse horticulture sector’s fossil-free cultivation goals by 2040. Greensoils, with its commitment to quality substrates and coco coir blends, can play a pivotal role in supporting sustainable practices by providing growers with premium growing media designed to enhance crop health and yield while aligning with environmentally conscious farming initiatives. Together, these efforts pave the way for a greener, more sustainable future in strawberry cultivation.

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