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Briefing about hydroponics cultivation in polyhouse

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Rice field

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Rice field....

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Bangla LifeScape

Green grape cultivation in your polyhouse in Bangladesh can be highly successful due to the ability to control the microclimate. Here's a customized guide considering Bangladesh’s subtropical climate

1. Recommended Varieties for Bangladesh (Polyhouse)

Choose early-maturing and heat-tolerant seedless or low-seed green grape varieties:

Thompson Seedless – Popular, high yield, sweet taste

Perlette – Early ripening, suited for warm climates

Italia – Tolerant to heat and humidity

Sugraone (Superior Seedless) – Commercially viable, good shelf life

2. Climate Control Inside the Polyhouse

Optimal Temperature: 25–32°C (avoid >35°C)

Humidity: Maintain 60–70% RH (prevent fungal diseases)

Ventilation: Essential during humid months (June–Sept)

Foggers/Misters: Use during dry winter to maintain RH

Roof height: 4–5 meters for proper trellising and airflow

3. Growing Medium and Bed Preparation

If soil-based: Use sandy loam with high organic content and pH 6.5–7.5

If soilless/hydroponic:

Cocopeat + perlite (70:30) or Cocopeat + vermicompost mix

Use grow bags or vertical systems with proper drainage

4. Planting and Spacing

Spacing: 6x4 feet (soil) or 4x3 feet (hydroponic bags)

Season: Plant in December–January for flowering by March–April

Ensure good root development before summer

5. Fertigation Plan (Example)

Using drip fertigation:

Pre-flowering: High N (urea), moderate P and K

Flowering to fruit set: High P and K, reduce N

Fruit development: KNO₃, CaNO₃, MgSO₄; micronutrients like Zn, B, Fe via foliar

Weekly fertigation schedules can be shared if needed.

6. Pruning & Training

First pruning: After 6–8 months of growth (rest pruning)

Fruit pruning: 30–40 days before expected flowering

Use T-bar or Y-shaped trellis system

Ensure 1 main trunk per vine, allow 1–2 fruiting canes per arm

7. Pest & Disease Management

Common problems in Bangladesh’s humid climate:

Downy mildew – Use copper-based or biofungicides (Trichoderma)

Powdery mildew – Sulfur or potassium bicarbonate sprays

Mealybug, fruit borers, mites – Neem oil, Spinosad, or Beauveria-based sprays

Use yellow/blue sticky traps

8. Harvesting

4–5 months after fruit pruning

Harvest when berries are firm, sweet (18–22° Brix)

Multiple cycles possible with good pruning and management

9. Expected Yield

Soil-based polyhouse: 20–25 tons/ha/year

Hydroponic: 25–30 tons/ha/year (with ideal fertigation and disease control)