🎒 Crop Production Under Protected Conditions

This lesson builds core elective concepts in BSc Agriculture with practical applications and exam-oriented clarity.

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Crop Production Under Protected Conditions

Major Crops Grown Under Protection

Protected cultivation in India focuses on high-value crops that justify the investment in infrastructure. The primary categories include vegetables, flowers, fruits, and nursery plants.

Vegetable Production

Tomato

• Most widely grown vegetable under protected conditions in India
• Indeterminate varieties preferred: trained to single or double stem using string and wire support
• Yield potential: 120 to 180 tonnes per hectare (compared to 40 to 60 tonnes in open field)
• Varieties: Naveen 2000+, Arka Rakshak, Syngenta Abhimanyu, Seminis 1057

Capsicum (Bell Pepper)

• Colored capsicum (red, yellow, orange) is a premium greenhouse crop
• Spacing: 45 cm x 30 cm in double-row beds
• Requires consistent temperature of 20 to 25 degrees Celsius for color development
• Yield: 80 to 120 tonnes per hectare under hi-tech polyhouse conditions

Cucumber

• Parthenocarpic (seedless) hybrids are exclusively grown under protection
• Very fast-growing crop with first harvest in 40 to 45 days after transplanting
• Requires high humidity (70 to 80%) and temperatures of 24 to 28 degrees Celsius
• Yield potential: 100 to 150 tonnes per hectare per year with multiple cropping cycles

Flower Production

Crop	Structure Used	Key Requirement	Annual Yield
Rose	Polyhouse with fan-and-pad	Cool nights (14 to 16 degrees Celsius)	200 to 350 stems per sqm
Gerbera	Naturally ventilated polyhouse	Well-drained media, bright light	180 to 250 stems per sqm
Carnation	Hi-tech greenhouse	Photoperiod manipulation	200 to 300 stems per sqm
Orchid	Shade net house (50 to 75%)	High humidity, filtered light	8 to 12 spikes per plant
Anthurium	Shade net house (75%)	Warm and humid conditions	6 to 8 flowers per plant

Fruit Crops

• Strawberry: Grown in polyhouse or low tunnels using raised beds with plastic mulch. Soilless culture in coco-peat grow bags yields 500 to 800 g per plant.
• Papaya: Rain shelters protect the crop from papaya ring spot virus and excessive moisture.
• Grapes: Plastic rain shelters prevent berry cracking and reduce fungal disease in premium table grape varieties.

Nursery and Seedling Production

Protected nurseries ensure:

• Uniform germination in plug trays under controlled temperature and humidity
• Hardening of tissue-cultured plantlets before field transplanting
• Disease-free seedlings through insect-proof net house production
• Common crops: tomato, brinjal, chili, capsicum, and flower seedlings

Agronomic Practices

• Training and pruning: Essential for indeterminate crops; removes lateral shoots and directs energy to fruiting
• Pollination: Manual vibration or bumblebee introduction for tomato; parthenocarpic varieties eliminate pollination need in cucumber
• Fertigation scheduling: Nutrient delivery through drip lines adjusted based on crop growth stage, EC, and pH monitoring
• Crop rotation: Alternating between solanaceous and cucurbit families to minimize disease carryover

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Summary Cheat Sheet

Topic	Key takeaway
Main focus	Crop Production Under Protected Conditions.
Section context	Revise this lesson with the rest of Growing Systems & Production for stronger conceptual continuity.