Planning polyhouse farming in Arrah? Arrah is a mid-sized city in Bhojpur district, Bihar, home to about 2.6 lakh people (Census 2011)[1], about 500 km from Kolkata. We have used the monthly climate for Arrah 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 Arrah
May is the hottest month in Arrah, with average daily highs of about 42°C. January has the coolest nights, averaging 8°C.[2] The area gets about 968 mm of rain a year, most of it in June to September, peaking in July at about 273 mm. Average humidity stays at 75% or more in July to September, which raises the risk of leaf disease and slows evaporative cooling. Arrah sits about 190 m above sea level.[1] On the Köppen–Geiger climate map, Arrah falls in the humid subtropical with dry winters zone (Cwa).[3]
Arrah climate by month
Month
Avg high (°C)
Avg low (°C)
Humidity (%)
Rain (mm)
Jan
23.1
8.1
50
11
Feb
28.3
11.7
43
14
Mar
35.0
17.4
31
9
Apr
40.7
23.9
25
14
May
42.4
28.0
31
46
Jun
40.0
29.7
48
147
Jul
34.1
27.0
76
273
Aug
32.4
26.0
83
229
Sep
31.4
24.6
84
173
Oct
30.6
20.2
73
47
Nov
27.3
14.3
62
2
Dec
23.6
9.5
56
3
Area averages (a grid cell of about 50 km) for 2001–2025, from NASA POWER, centred on Arrah. Rainfall and night temperatures at your plot can differ, especially near hills and the coast.[2]
Advantages of protected cultivation in Arrah
1
ఏడాది పొడవునా పంటలు
A polyhouse stretches the season: in Arrah cucumber can be grown for about 8 months a year under cover, longer than in the open field.
2
మెరుగైన దిగుబడి మరియు ధర
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
తక్కువ నీరు
Drip irrigation under cover uses less water than flood irrigation, and the roof keeps July's 273 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 September), so you spray less often.
5
సబ్సిడీకి అర్హం
Polyhouse, shade net and nethouse projects in Bihar can apply for Mission for Integrated Development of Horticulture (MIDH) assistance through the state horticulture department.[4]
Which polyhouse suits Arrah?
For polyhouse farming in Arrah, the structure decides which months you can crop and what it costs to run. The heat in Arrah comes with dry air. In April to June, average highs reach 42°C while average humidity is only about 35%. In that dry air, wet pads can bring a 42°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. For vine crops such as capsicum and cucumber, a naturally ventilated polyhouse with a shade screen works from February and October to November and costs less to run.
Plan for heavy rain in July (about 273 mm): raise the plinth, size the gutters for that month and keep drains away from the nutrient tank. Sunlight peaks in April at about 6.5 kWh per m² a day, so add a shade screen for leafy greens in the brightest months. 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 Arrah
Based on Arrah's climate, the crops with the longest growing windows are cucumber (8 months), chilli pepper (8 months) and capsicum (7 months). Cucumber fits March to May and July to November with Fan & Pad cooling. These are the crops we would plan first for polyhouse farming in Arrah.
Months each crop suits in Arrah
పంట
సహజ వెంటిలేషన్ పాలీహౌస్
With Fan & Pad cooling
క్యాప్సికమ్
Feb and Oct–Nov
Feb–Apr and Aug–Nov
టమాటా
Feb and Oct–Dec
Feb–Apr and Sep–Dec
దోసకాయ
Aug–Nov
Mar–May and Jul–Nov
Chilli pepper
Feb and Aug–Nov
Feb–Apr and Jul–Nov
వంకాయ
Aug–Nov
Mar–Apr and Jul–Nov
లెట్యూస్
Nov–Jan
Oct–Apr
బ్రోకలీ
Dec–Jan
Nov–Mar
స్ట్రాబెర్రీ
Dec–Jan
Nov–Feb
గులాబీ
Nov–Dec
Feb–Mar and Oct–Dec
గెర్బెరా
Nov–Dec
Feb–Mar and Oct–Dec
కార్నేషన్
Dec–Jan
Nov–Mar
చామంతి
Nov–Dec
Feb–Mar and Oct–Dec
ఆంథూరియం
Difficult
Mar–Apr and Jul–Oct
ఆర్కిడ్లు
Difficult
Mar–Apr and Jul–Oct
లిలియం
Dec–Jan
Nov–Mar
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[5]
500 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.[5] Arrah is large enough for steady local sales to restaurants, hotels and fruit-and-vegetable retailers. Start with a farm size that matches the orders you can confirm.
Polyhouse farming in Arrah with Kryzen
We have built 2 projects in Bihar so far (see our project map (కొత్త ట్యాబ్లో తెరుచుకుంటుంది)). Arrah is about 1,150 km in a straight line from our Chhatrapati Sambhajinagar warehouse, our nearest site.
Towns near Arrah
We also plan and build farms in these towns near Arrah:
Map: LGD 2024 boundaries via bharatlas, CC BY 4.0. For illustration only.
Polyhouse farming in Arrah: FAQs
Can a polyhouse farm run all year in Arrah?
Yes, with the right structure. For Arrah 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 Arrah?
With May highs of about 42°C and 31% 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 Arrah?
Going by the monthly climate, cucumber, chilli pepper and capsicum have the longest growing windows. Confirm prices and volumes with buyers before you plant.
Is polyhouse farming profitable in Arrah?
It can be, if the crop, the structure and the buyers match. In Arrah, cucumber 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 Arrah?
Yes. Our nearest site is our Chhatrapati Sambhajinagar warehouse, about 1,150 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 Arrah 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.
