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Overhead shade-cloth for pomegranate

Overhead shade-cloth (and anti-hail-net) systems are a protected-cultivation technique used in commercial Indian pomegranate orchards to reduce sunburn, fruit cracking and hail damage during the hot Maharashtra-Solapur summers. The approach is supported by research at ICAR-NRC Pomegranate, Solapur, and by Mission for Integrated Development of Horticulture (MIDH) subsidies.

Principle

Pomegranate fruit tolerates temperatures up to around 35 deg C; beyond this threshold, fruit skin develops sunburn, brown staining and surface cracks that downgrade or destroy market value. Maharashtra summers regularly exceed 40-45 deg C in the major growing belts, particularly during the second half of the mrigbahar cycle (Pomegranate Ahar Bahar Cycling). An overhead net or porous cloth reduces direct solar radiation, lowers canopy and fruit temperature by several degrees and buffers against hail.

Implementation

A typical installation uses high-tensile galvanised steel cables strung over the orchard rows at canopy height, with a green or white woven polymer shade-net (often 25-50% shade factor) draped across them. Anchoring poles are set on a grid (e.g., 8 x 10 m or 10 x 12 m), and the net is removable for pruning and pesticide application. Integration with drip irrigation, foliar nutrition and disease management (Pomegranate Anthracnose Bacterial Blight) is unchanged from open-orchard practice.

Adoption context

The system was pioneered at Satmane village near Solapur and is now used by progressive Bhagwa growers (Pomegranate Bhagwa) across the Maharashtra-Karnataka belt. Research at ICAR-NRCP and reported in Scientific Reports shows sunburn incidence falling from around 41% in open orchards to around 12% under shade-net, and fruit cracking from around 27% to around 11%. MIDH subsidies under the protected-cultivation component offset part of the capital cost.

Limitations

Capital cost remains significant and net systems require maintenance against UV degradation and wind. Excessive shading can also reduce TSS in the cooler months and may favour anthracnose under high humidity, so net selection (shade factor, mesh opening) is matched to local climate.

See also: Pomegranate Bhagwa, Pomegranate Ahar Bahar Cycling, Pomegranate Anthracnose Bacterial Blight, Nematode Pomegranate.

References

  1. Shading net alleviates heat stress in pomegranate. Scientific Reports.
  2. ICAR-NRC Pomegranate Solapur. Institutional portal.