What Is Greenhouse Shading and Why Is It So Important?
During the summer months, temperatures inside greenhouses can reach 50–60 °C, leading to leaf burn, cessation of pollination and 30–40% harvest losses. Greenhouse shading entails applying special shading paint (also known as "shading compound") to the glass or polycarbonate of the structure, which reflects part of the solar radiation and lowers the internal temperature by 8–12 °C.
This is an established practice in Western Europe, Turkey and Israel, and in recent years it has been increasingly adopted in Bulgaria too – especially in the regions of Plovdiv, Pazardzhik, Haskovo and Stara Zagora, where greenhouse production is concentrated.
Traditionally, shading paint is applied manually or with ground sprayers, but today greenhouse shading with a drone offers a dramatically faster, safer and more uniform approach. At AirAgro we use the DJI Agras T50 – the most advanced agri-drone on the market – to provide this service to greenhouse farmers throughout Southern Bulgaria.
Traditional Methods vs. Drone Shading
Manual Application
With the classic approach, workers climb onto the greenhouse roof with brushes or rollers and apply the paint by hand. This is:
- Slow – a team of 4–5 people covers only 1,000–2,000 m² per day
- Dangerous – working at height without proper safety equipment
- Uneven – different layer thicknesses lead to "hot spots"
- Expensive – high labour and scaffolding costs
Ground Sprayers
Faster than manual application, but with limitations for tall greenhouses, complex roof shapes and difficult-to-access sections. Spraying upwards from below leads to material loss and uneven coverage.
Drone for Shading – the New Standard
With a drone like the DJI Agras T50, shading paint is applied from top to bottom – exactly the way sunlight falls. The result is:
- A perfectly uniform layer across the entire surface
- Coverage of up to 10,000 m² per hour (10 decares)
- Zero risk for workers – no scaffolding and no climbing onto roofs
- Minimal material consumption thanks to precision nozzles
How the DJI Agras T50 Applies Shading Paint
The DJI Agras T50 is DJI's flagship in the agri-drone segment and is ideal for painting greenhouses with a drone. Here are its main features that make the service possible:
| Parameter | Value | | --------------- | ------------------------ | | Tank | 40 litres | | Working width | up to 11 metres | | Flow rate | 6–12 L/min (adjustable) | | Precision | RTK positioning (±2 cm) | | Autonomy | up to 20 min per flight | | Spraying system | Dual centrifugal nozzles |
Process Steps
- Survey and planning – our pilot assesses the area, height and type of roof covering. A flight plan with precise GPS coordinates is prepared.
- Solution preparation – the shading paint is diluted according to the manufacturer's recommendations and loaded into the drone's tank.
- Automatic application – the drone follows the pre-set route with RTK precision. Specialised nozzles ensure uniform droplets with a size of 100–300 µm.
- Quality control – after application we inspect the coverage and make an additional pass if needed.
The entire process for a greenhouse of 5,000 m² takes an average of 30–45 minutes – including preparation and loading. By comparison, the manual method requires 2–3 working days.
Types of Shading Paint for Greenhouses
Choosing the right shading paint is key to the effectiveness of the service. Here are the main categories:
Temporary Shading Paint (Seasonal)
- Applied in spring (April–May), lasts until autumn
- Gradually washed off by rain or removed mechanically
- Ideal for seasonal vegetable cultivation
- Examples: ReduSol, Eclipse LD, Transpar
Semi-Permanent Shading Paint
- Lasts 6–12 months
- Requires a special removal agent (ReduClean)
- Suitable for year-round greenhouses with heating
Specialised Coatings
- UV-blocking (e.g. ReduFuse) – diffuses direct light without reducing total light levels
- NIR-reflecting (e.g. ReduHeat) – blocks infrared radiation while preserving photosynthetically active light
- Anti-condensation – reduces dripping in winter months
With greenhouse drone shading we can apply all these types of coatings. Our operators are trained to adjust flow rate and flight height according to the viscosity and density of the specific product.
Benefits of Greenhouse Shading with a Drone
1. Dramatic Temperature Reduction
Correctly applied shading paint lowers the internal temperature by 8–12 °C. At an external temperature of 38 °C, the interior of an unshaded greenhouse reaches 55 °C, while a shaded one remains at around 43–45 °C. This is within the comfort zone for most vegetable crops.
2. UV Protection for Crops
Excessive UV radiation causes:
- Burning of leaves and fruits
- Chlorophyll breakdown
- Reduced photosynthesis
Shading paints filter up to 50% of UV rays, while preserving sufficient light for photosynthesis.
3. Better Humidity Control
Lower temperatures mean slower evaporation and more stable humidity (60–75%), which reduces:
- Plant stress
- Spread of fungal diseases
- The need for additional irrigation
4. Higher Yields
Research shows that proper greenhouse shading increases yields by 15–25% for tomatoes and peppers, thanks to:
- A longer productive fruiting period
- Less flower abortion
- Larger and higher-quality fruits
5. Speed and Efficiency
With the DJI Agras T50 we cover up to 10,000 m² per hour. This means that even a large greenhouse of 20–30 decares can be shaded in one working day – unthinkable with manual labour.
6. Safety
Zero need for scaffolding, ladders or roof climbing. Our pilots are certified by DJI Academy and work in strict compliance with all requirements of the General Directorate "Civil Aviation Administration".
7. Cost Effectiveness
Although the drone service appears more expensive at first glance, the total cost is lower because of:
- Less paint used (uniform application without waste)
- No scaffolding or labour hire costs
- Faster coverage = fewer labour hours
When Should You Shade Your Greenhouse?
Spring Application (April–May)
The optimal time for applying shading paint is late April to early May, when daytime temperatures begin to exceed 25 °C. In the Plovdiv and Pazardzhik area this is usually around 20–25 April, while in Haskovo and Stara Zagora – early May.
Autumn Removal (October–November)
Temporary paints wash off naturally with autumn rains. For semi-permanent coatings, cleaning with ReduClean is required – also possible by drone.
Winter Anti-Condensation Coating
For year-round heated greenhouses, an anti-condensation coating can be applied in November–December, which reduces dripping and improves light transmission.
Which Crops Benefit Most from Shading?
Tomatoes
Tomatoes are extremely sensitive to overheating. At temperatures above 35 °C, pollen loses viability and fruits do not set. Shading extends the active fruiting period by 3–4 weeks.
Peppers
Peppers react to excessive light with sunscald on the fruits. Greenhouse shading reduces this problem by up to 80%.
Cucumbers
Cucumbers prefer diffused light. Paints such as ReduFuse increase cucumber yields by up to 20%, as light penetrates deeper into the plant canopy.
Flowers (roses, gerberas, chrysanthemums)
Floriculture greenhouses are among the most frequent clients for this service. Shading prevents colour fading and extends the vase life of cut flowers.
Nurseries
Young seedlings are particularly vulnerable to direct sunlight. Shading in nurseries is an obligatory practice for quality seedling production.
Greenhouse Shading with a Drone in Southern Bulgaria
AirAgro offers the greenhouse drone shading service throughout Southern Bulgaria, including:
- Plovdiv and Plovdiv Province – Sadovo, Parvomay, Asenovgrad, Rakovski
- Pazardzhik and Pazardzhik Province – Septemvri, Belovo, Velingrad
- Haskovo and Haskovo Province – Dimitrovgrad, Svilengrad, Harmanli
- Stara Zagora and Stara Zagora Province – Kazanlak, Chirpan, Radnevo
- The Thracian Plain – one of the largest greenhouse regions in the country
- Dobrudzha – we also serve northern regions upon request
Our pilots are certified by DJI Academy, and all preparations we use are approved by BFSA (Bulgarian Food Safety Agency) for use in agriculture.
How to Order the Service from AirAgro
The process is easy and fast:
- Contact us at tel. +359 884 242 406 or via the form at airagro.bg
- Free inspection – our specialist visits the greenhouse, measures the area and assesses the type of roof covering
- Individual shading plan – we recommend the appropriate paint type and application schedule
- Execution – the drone applies the paint in hours, not days
- Quality check and guarantee – we inspect coverage quality and guarantee uniformity
Learn more about our agri-drone services or see how we carry out vegetable spraying with a drone. For the full list of services visit our drone spraying page.
Frequently Asked Questions
How long does greenhouse shading with a drone take?
It depends on the area, but as a guideline: a greenhouse of 5,000 m² (5 decares) is shaded in 30–45 minutes. For greenhouses of 20–30 decares – within one working day. This is 5–10 times faster than the manual method.
Is the shading paint safe for plants and people?
Yes. All shading paints we use are certified for agricultural use and approved by BFSA. They are water-based, non-toxic and do not affect the quality of produce. Once they have served their purpose, the paints biodegrade naturally or are washed off with water.
Can the drone work in wind or rain?
The DJI Agras T50 has a protection class of IP67 and can operate in light winds (up to 6 m/s). We do not recommend application in strong wind or rain, as this affects the uniformity of coverage. Our pilots monitor meteorological conditions and schedule flights for optimal hours – usually early morning (6:00–10:00) or late afternoon (17:00–19:00).
How much does greenhouse drone shading cost?
The price depends on the greenhouse area, paint type and site accessibility. We provide a free consultation and inspection, after which we prepare an individual quote. Contact us at +359 884 242 406 for a specific price. Overall, the drone service is more cost-effective than the manual method for areas over 2,000 m².
How often should the greenhouse be shaded?
When using temporary paint – once a year, at the beginning of the warm season (April–May). The paint lasts 4–6 months and gradually washes off. For semi-permanent coatings – every 1–2 years, depending on climatic conditions and greenhouse exposure.
Conclusion – Invest in the Comfort of Your Crops
Greenhouse drone shading is a modern, fast and cost-effective solution that protects your crops from overheating, increases yields and reduces operating costs. With the DJI Agras T50 and the AirAgro team you get professional coverage in hours, not days.
Are you ready to protect your greenhouse?
- Request a free consultation and greenhouse inspection
- Ask for a demonstration of the technology on-site
- Receive an individual shading plan for your greenhouse
Call +359 884 242 406 or write to us at airagro.bg. We serve greenhouses in Plovdiv, Pazardzhik, Haskovo, Stara Zagora, Dobrudzha and the entire Thracian Plain.
