Planning polyhouse farming in Supaul? Supaul is a town in Supaul district, Bihar, home to about 65,000 people (GeoNames)[1][2], about 430 km from Kolkata. We have used the monthly climate for Supaul to plan a structure, a growing system and a crop calendar, so you can compare them with your own plot and buyers.
Climate for polyhouse farming in Supaul
May is the hottest month in Supaul, with average daily highs of about 39°C. January has the coolest nights, averaging 8°C.[3] The area gets about 1,165 mm of rain a year, most of it in June to September, peaking in July at about 317 mm. Average humidity stays at 75% or more in July to October, which raises the risk of leaf disease and slows evaporative cooling. Supaul sits about 34 m above sea level.[2] On the Köppen–Geiger climate map, Supaul falls in the humid subtropical with dry winters zone (Cwa).[4]
Supaul climate by month
Month
Avg high (°C)
Avg low (°C)
Humidity (%)
Rain (mm)
Jan
23.1
8.3
53
7
Feb
28.0
12.0
44
10
Mar
34.4
17.6
32
19
Apr
38.6
23.2
34
40
May
39.0
26.3
47
97
Jun
37.2
27.6
62
182
Jul
32.7
26.3
82
317
Aug
32.0
25.9
85
217
Sep
31.0
24.6
86
211
Oct
29.9
20.6
79
60
Nov
27.2
14.9
69
3
Dec
23.6
9.9
62
2
Area averages (a grid cell of about 50 km) for 2001–2025, from NASA POWER, centred on Supaul. Rainfall and night temperatures at your plot can differ, especially near hills and the coast.[3]
Advantages of protected cultivation in Supaul
1
Year-round crops
A polyhouse stretches the season: in Supaul capsicum can be grown for about 9 months a year under cover, longer than in the open field.
2
Better yield and price
Plants grow without rain, hail and wind damage, so yields are higher and more even, and clean, graded produce sells at a better price, especially off-season.
3
Less water
Drip irrigation under cover uses less water than flood irrigation, and the roof keeps July's 317 mm of rain off the crop and the soil.
4
Less pesticides
Insect net on vents and doors keeps out most pests, and controlled ventilation helps with leaf disease in the humid months (July to October), so you spray less often.
5
Subsidy eligible
Polyhouse, shade net and nethouse projects in Bihar can apply for Mission for Integrated Development of Horticulture (MIDH) assistance through the state horticulture department.[5]
Which polyhouse suits Supaul?
For polyhouse farming in Supaul, the structure decides which months you can crop and what it costs to run. The heat in Supaul comes with dry air. In April to May, average highs reach 39°C while average humidity is only about 41%. In that dry air, wet pads can bring a 39°C May afternoon down to roughly 32°C inside a Fan & Pad polyhouse, which keeps herbs and vine crops going; lettuce will still struggle in the hottest weeks. For vine crops such as capsicum and cucumber, a naturally ventilated polyhouse with a shade screen works from February and September to November and costs less to run.
Plan for heavy rain in July (about 317 mm): raise the plinth, size the gutters for that month and keep drains away from the nutrient tank. A nethouse, the lowest-cost option, can grow hardy crops in February and October to November, when it is mild and fairly dry.
Crops for Supaul
Based on Supaul's climate, the crops with the longest growing windows are capsicum (9 months), cucumber (9 months) and chilli pepper (9 months). Capsicum fits February to May and July to November with Fan & Pad cooling. These are the crops we would plan first for polyhouse farming in Supaul.
Months each crop suits in Supaul
Crop
Naturally ventilated polyhouse
With Fan & Pad cooling
Capsicum
Feb and Sep–Nov
Feb–May and Jul–Nov
Tomato
Feb and Sep–Dec
Feb–Apr and Sep–Dec
Cucumber
Jul–Nov
Mar–Nov
Chilli pepper
Feb and Jul–Nov
Feb–May and Jul–Nov
Brinjal
Jul–Nov
Mar–May and Jul–Nov
Lettuce
Nov–Feb
Oct–Apr
Broccoli
Dec–Jan
Nov–Feb
Strawberry
Dec–Jan
Nov–Feb
Rose
Feb and Nov–Dec
Feb–Mar and Oct–Dec
Gerbera
Feb and Nov–Dec
Feb–Apr and Oct–Dec
Carnation
Dec–Jan
Nov–Feb
Chrysanthemum
Feb and Nov–Dec
Feb–Mar and Oct–Dec
Anthurium
Oct
Mar–May and Jul–Oct
Orchids
Oct
Mar–May and Jul–Oct
Lilium
Dec–Jan
Nov–Feb
Kryzen planning estimate from the monthly averages above and each crop's usual day and night temperature range. Variety, soil or substrate temperature and shading change the result, so confirm with a trial.
₹5,165Spending per person per month, urban Bihar, 2023–24[6]
430 kmto Kolkata, the nearest metro (straight line)
Urban households in Bihar spent an average of ₹5,165 per person per month in 2023–24, below the all-India urban average of ₹7,078.[6] Local demand in Supaul may be small for exotic greens, so plan where the rest of the harvest goes. Saharsa, about 30 km away, is the nearest larger market on our list.
Polyhouse farming in Supaul with Kryzen
We have built 2 projects in Bihar so far (see our project map (opens in a new tab)). Supaul is about 1,340 km in a straight line from our Chhatrapati Sambhajinagar warehouse, our nearest site.
Towns near Supaul
We also plan and build farms in these towns near Supaul:
Map: LGD 2024 boundaries via bharatlas, CC BY 4.0. For illustration only.
Polyhouse farming in Supaul: FAQs
Can a polyhouse farm run all year in Supaul?
Yes, with the right structure. For Supaul we would plan a Fan & Pad polyhouse for leafy greens. Even then, lettuce is hard to grow in May to September, so plan another crop for those months.
Which polyhouse is best for Supaul?
With May highs of about 39°C and 47% average humidity in that month, we would start with a Fan & Pad polyhouse for leafy greens.
Which crops should I grow in a polyhouse in Supaul?
Going by the monthly climate, capsicum, cucumber and chilli pepper have the longest growing windows. Confirm prices and volumes with buyers before you plant.
Is polyhouse farming profitable in Supaul?
It can be, if the crop, the structure and the buyers match. In Supaul, capsicum and cucumber have the longest seasons under cover. Confirm prices and volumes with buyers first; our Detailed Project Report works out the cost, yield and returns for your plot.
Does Kryzen build polyhouses in Supaul?
Yes. Our nearest site is our Chhatrapati Sambhajinagar warehouse, about 1,340 km away, and we have built 2 projects in Bihar.
Is there a subsidy for polyhouse or hydroponic farms in Bihar?
Yes. Protected cultivation projects in Bihar can apply for Mission for Integrated Development of Horticulture (MIDH) assistance through the state horticulture department. Check the current rate and area limit when you apply.
Discuss your Supaul farm project
Share your plot location, water test and crop targets. We will suggest the right structure and growing system, and send an itemised quotation.
A computer engineer turned hydroponic farmer from a multigenerational farming family in Satara. Sudhir founded Kryzen in 2019, and the team has since built 350+ protected and hydroponic farms across India.
