Antifreeze spraying for kiwis: an essential solution for professional producers

Frost is one of the main challenges facing kiwi growers in France. Damage caused by spring frosts can seriously compromise production, affecting both fruit quality and quantity. Frost protection spraying is a proven method that uses the principle of latent heat to protect buds and young shoots during critical periods.

In this article, we detail everything you need to know to set up a frost protection sprinkler system suitable for your orchards and maximize its effectiveness.

The principle of antifreeze spraying: how does it work?

Frost protection spraying relies on a physical phenomenon: the latent heat of solidification. When water sprayed on plants freezes, it releases about 80 calories of heat per gram of solidified water, keeping plant tissues at a temperature close to 0°C, preventing frost damage.

Why use antifreeze spray for kiwis?

• Protection against radiative and advective frosts: This method is effective in protecting buds, young shoots and scaffolds down to temperatures of -7°C.
• Uniformity of protection: With a well-designed system, all plants receive even coverage.
• Proven reliability: Anti-freeze spraying is one of the most widely used techniques by kiwi growers in France.

Steps to Installing a High-Performance Antifreeze Sprinkler System

1. Study the configuration of the orchard

Before any installation, assess the layout of your kiwi plants:

• Row spacing and plant height: These elements determine the positioning of the sprinklers.
• Frost-prone areas: Identify low-lying areas or areas exposed to cold winds, as these require special attention.

2. Choose the right sprinklers

Frost protection sprinklers are specially designed to distribute fine water droplets evenly:

• Canopy spraying: Effectively protects buds and young shoots by applying water directly to the canopy.
• Micro-sprinklers: Used for targeted application and reduced water consumption.
• Spray angle: For hail nets, choose low-angle sprinklers to prevent ice buildup on the nets.

3. Install an efficient water network

An antifreeze sprinkler system requires a robust infrastructure to ensure sufficient flow and pressure:

• Required flow rate: Allow a minimum of 40 m³/h per hectare to ensure even coverage.
• Pressure: Maintain a pressure of 5 to 6 bars at the pump outlet to obtain 3.5 bars at the sprinklers.
• Dual Network: For orchards equipped with irrigation, consider a separate network for antifreeze.

4. Ensure even coverage

• Position the sprinklers approximately 50 cm above the canopy to prevent the jets from being blocked by branches.
• Distance between sprinklers: Adopt a coverage of 20 x 20 m or 20 x 16 m depending on the arrangement of the rows.
• Install a line of sprinklers along the edges of the plot to avoid blind spots.

Operational management: system activation and maintenance

1. When to start spraying?

• Use a weather station or temperature sensors to monitor conditions in real time.
• Start sprinkling when the temperature approaches 0.5°C to 0°C, before frost sets in.
• Continue spraying continuously until the temperature rises above 0°C.

2. Regular maintenance

• Sprinkler Check: Check that each sprinkler is working properly and covering the intended area.
• Water filtration: Install filters (100 to 150 microns) to prevent clogging of sprinklers, especially if the water comes from a borehole.
• Pipe monitoring: Repair any leaks immediately to maintain pressure.

Benefits of Frost Protection Spraying for Kiwis

• Production security: Protects your buds and young shoots, ensuring an optimal harvest even after spring frosts.
• Adaptability: Suitable for different kiwi growing systems, such as T-bar and pergola.
• Profitability: Reduces yield losses, quickly justifying the initial investment.

FAQs about antifreeze spraying for kiwis

How much water is needed to protect one hectare of kiwi?

A minimum flow rate of 40 m³/h is required per hectare. Ensure you have a reliable water source to maintain continuous irrigation.

When should I start antifreeze spraying?

Start sprinkling when the temperature approaches 0°C and continue until it rises.

What types of sprinklers do you recommend?

Opt for low-pressure sprinklers or micro-sprinklers to reduce water consumption while ensuring effective protection.

How to avoid root asphyxiation with antifreeze spraying?

Improve your soil drainage and avoid excess water by installing drainage systems or growing on mounds.

Conclusion

Frost protection spraying is an essential solution for protecting your kiwi orchards from spring frosts. By implementing a suitable and well-maintained system, you can effectively protect your plants and maximize your yields. With Kiwiverse, benefit from tailored support, quality products, and responsive service to ensure success at every stage of your production.

Contact us today to design your frost protection sprinkler system and order your kiwi plants with fast delivery to your plot!