Planning polyhouse farming in Forbesganj? Forbesganj is a town in Araria district, Bihar, home to about 50,000 people (GeoNames)[1][2], about 430 km from Kolkata. Below we use the town's monthly temperatures, humidity and rainfall to work out which structure fits, which crops to grow and in which months, before you spend on construction.
Climate for polyhouse farming in Forbesganj
May is the hottest month in Forbesganj, with average daily highs of about 37°C. January has the coolest nights, averaging 11°C.[3] The area gets about 1,393 mm of rain a year, most of it in May to September, peaking in July at about 379 mm. Average humidity stays at 75% or more in July to October, which raises the risk of leaf disease and slows evaporative cooling. Forbesganj sits about 46 m above sea level.[2] On the Köppen–Geiger climate map, Forbesganj falls in the humid subtropical with dry winters zone (Cwa).[4]
Forbesganj climate by month
Month
Avg high (°C)
Avg low (°C)
Humidity (%)
Rain (mm)
Jan
23.6
10.5
49
6
Feb
27.9
13.6
41
10
Mar
33.6
18.4
32
23
Apr
37.1
22.9
37
53
May
37.2
25.2
53
128
Jun
35.8
26.5
69
216
Jul
32.3
26.0
85
379
Aug
32.0
25.7
86
269
Sep
31.0
24.5
86
235
Oct
30.0
21.2
77
68
Nov
27.6
16.6
65
4
Dec
24.4
12.3
57
2
Area averages (a grid cell of about 50 km) for 2001–2025, from NASA POWER, centred on Forbesganj, adjusted for the town's elevation[5]. Rainfall and night temperatures at your plot can differ, especially near hills and the coast.[3]
Advantages of protected cultivation in Forbesganj
1
Year-round crops
Under cover, capsicum can be grown for 11 months a year in Forbesganj, so you can supply buyers every week instead of one open-field season.
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 379 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.[6]
Which polyhouse suits Forbesganj?
For polyhouse farming in Forbesganj, the structure decides which months you can crop and what it costs to run. Average highs stay at 33°C or more in March to June, with moderate humidity of about 48%. In that dry air, wet pads can bring a 37°C May afternoon down to roughly 31°C inside a Fan & Pad polyhouse, which keeps herbs and vine crops going; lettuce will still struggle in the hottest weeks. Capsicum, cucumber and tomato do well in a naturally ventilated polyhouse with a shade screen. If you want one structure, decide by crop: greens all year point to Fan & Pad; vine crops point to a naturally ventilated house.
Plan for heavy rain in July (about 379 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 to March and October to December, when it is mild and fairly dry.
Crops for Forbesganj
Based on Forbesganj's climate, the crops with the longest growing windows are capsicum (11 months), chilli pepper (11 months) and cucumber (10 months). Capsicum fits February to December with Fan & Pad cooling. These are the crops we would plan first for polyhouse farming in Forbesganj.
Months each crop suits in Forbesganj
Crop
Naturally ventilated polyhouse
With Fan & Pad cooling
Capsicum
Feb and Sep–Dec
Feb–Dec
Tomato
Sep–Feb
Sep–May
Cucumber
Feb–Mar and Jul–Nov
Feb–Nov
Chilli pepper
Feb and Jul–Dec
Feb–Dec
Brinjal
Feb and Jul–Nov
Feb–Nov
Lettuce
Nov–Feb
Sep–Apr
Broccoli
Jan
Nov–Feb
Strawberry
Dec–Jan
Dec–Feb
Rose
Nov–Feb
Oct–Mar
Gerbera
Nov–Feb
Oct–Apr
Carnation
Dec–Jan
Nov–Feb
Chrysanthemum
Nov–Feb
Oct–Mar
Anthurium
Oct–Nov
Mar–May and Jul–Nov
Orchids
Oct–Nov
Mar–May and Jul–Nov
Lilium
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[7]
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.[7] Local demand in Forbesganj may be small for exotic greens, so plan where the rest of the harvest goes. Purnia, about 60 km away, is the nearest larger market on our list.
Polyhouse farming in Forbesganj with Kryzen
We have built 2 projects in Bihar so far (see our project map (opens in a new tab)). Forbesganj is about 1,410 km in a straight line from our Chhatrapati Sambhajinagar warehouse, our nearest site.
Towns near Forbesganj
We also plan and build farms in these towns near Forbesganj:
Map: LGD 2024 boundaries via bharatlas, CC BY 4.0. For illustration only.
Polyhouse farming in Forbesganj: FAQs
Can a polyhouse farm run all year in Forbesganj?
Yes, with the right structure. For Forbesganj we would plan Fan & Pad cooling for leafy greens and a naturally ventilated polyhouse for vine crops. Even then, lettuce is hard to grow in May to August, so plan another crop for those months.
Which polyhouse is best for Forbesganj?
With May highs of about 37°C and 53% average humidity in that month, we would start with Fan & Pad cooling for leafy greens and a naturally ventilated polyhouse for vine crops.
Which crops should I grow in a polyhouse in Forbesganj?
Going by the monthly climate, capsicum, chilli pepper and cucumber have the longest growing windows. Confirm prices and volumes with buyers before you plant.
Is polyhouse farming profitable in Forbesganj?
It can be, if the crop, the structure and the buyers match. In Forbesganj, capsicum and chilli pepper 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 Forbesganj?
Yes. Our nearest site is our Chhatrapati Sambhajinagar warehouse, about 1,410 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 Forbesganj 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.
