Paprika (Capsicum annuum)

📚 Family/Class: Solanaceae (가지과) 🌱 Genus/Sub-category: Capsicum (고추속) 🧬 Species/Type: Capsicum annuum 🌍 Origin: Central & South America

Paprika (bell pepper) is a major high-tech greenhouse crop, typically trained in high-wire V-systems. Successful cultivation requires precise management of average daily temperature (ADT) and day/night temperature differentials (DIF) to maintain a balance between vegetative growth (stem and leaf size) and generative steering (fruit set and ripening). Unlike tomatoes, paprika has a distinct 'flushing' pattern where it sets fruit in cycles, requiring proactive steering adjustments.

Global Climate Strategy

🌍 South Korea (RDA Smart Farm)

Predominantly grown in high-roof glasshouses and modern plastic houses. Focus is on maintaining strict night temperatures (18-19°C) during winter using heating pipes under gutters. VPD is managed actively to prevent blossom-end rot (BER) and sunscald. ^[1]

⚙️ Tech Level: High (Gutter heating, automated vent screens, CO2 dosing)

🌍 The Netherlands (WUR)

Utilizes high-wire V-systems allowing high density planting. Relies on advanced climate computers to steer crop load dynamically. High thermal screens and active dehumidification are used to maintain optimal VPD (0.8 - 1.2 kPa) and save energy.

⚙️ Tech Level: Very High (Fully closed glasshouses, double screens, high-wire V-systems)

Crop Steering Parameters

Paprika steering focuses on avoiding excessive vegetative growth which leads to abortion of flower buds, while ensuring enough leaf canopy to prevent sunscald on ripening fruits.

Parameter	🌱 Vegetative Target (Leaf Growth)	🍅 Generative Target (Fruit Growth)
Temperature DIF	Low day-to-night temperature difference (e.g., Day 21°C / Night 19°C) and warm ADT.	Large day-to-night temperature difference (e.g., Day 24°C / Night 16°C) to stimulate flowering.
VPD (kPa)	0.5 - 0.7 kPa (Ensures low transpiration stress, promoting leaf expansion).	0.9 - 1.2 kPa (Drives transpiration and calcium transport to fruits).
Irrigation & Space Strategy	Frequent, short irrigation shots starting early. Lower root-zone EC (2.0 - 2.2 mS/cm).	Larger dry-backs between shots. Higher root-zone EC (2.8 - 3.2 mS/cm) to limit vegetative stretch.

Fertigation Strategy

Paprika requires careful management of the Potassium-to-Nitrogen (K:N) ratio to steer vegetative/generative balance, and sufficient Calcium (Ca) to prevent blossom-end rot.

Phase 1: Vegetative Vigor

Higher Nitrogen relative to Potassium. Target EC: 2.0 - 2.2 mS/cm. Keep pH in root zone between 5.5 - 6.2.

Phase 2: Generative / Brix Steering

Increase Potassium-to-Nitrogen ratio. Target EC: 2.5 - 3.0 mS/cm. Increase Calcium levels during high solar radiation days to support rapidly expanding fruits.

Ready to steer your crop?

AgriAtlas provides the theory, but every greenhouse is unique. Use our precise engineering calculators to hit these target VPD and Temperature DIF values based on your specific facility's U-Value and heating capacity.

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