Pollachi lies in western Tamil Nadu at the foothills of the Anamalai range, sitting at around 315 metres above sea level with a tropical wet-and-dry (savanna) climate. Summer highs climb to roughly 37°C by March, and unlike much of the state, the region draws rain from both monsoons, the southwest spell through June to August and the heavier northeast monsoon across October and November. Annual rainfall runs to about 1,200 mm, but it arrives in two long, unpredictable windows rather than one. For cucumber growers, that double-monsoon pattern is the real problem. The crop is fast-growing and moisture-sensitive, and prolonged leaf wetness from repeated rain invites downy mildew and other foliar diseases that can move through a planting in days.
Open-field cultivation here means timing a delicate crop around two rainy seasons and the disease pressure that comes with them.
The Structure
A 2,528 sqm Naturally Ventilated Polyhouse was installed to take that risk off the table. In Pollachi's climate, an active fan-and-pad system isn't warranted, what cucumber needs is a dry canopy, shelter from driving monsoon rain, and steady passive airflow to manage humidity and ease the March–May heat. An NVPH delivers exactly that, without the running cost of mechanical climate control.
The ventilation was laid out along the site's prevailing wind line, keeping air moving through the structure to hold humidity down during the wet months while sealing the crop off from direct rainfall when the monsoons arrive. Inside, 7,000 cucumber plants were established in soil and trained vertically, making full use of the protected vertical space.
The result is a stable, year-round growing environment for cucumber, one that holds up through both of Pollachi's monsoons and turns a difficult open-field crop into a manageable, repeatable one.
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