Climatic requirement :

• Wheat is a winter season crop.
• Can be cultivated upto 3300 masl and also cultivated in tropical , sub-tropical and temperate zones.

a) Solar radiation :

• It is a long day plant which require photo-period of more than 12 hours.
• Local landraces and traditional variety are sensitive to photo-periodism. But there are some modern varieties which are insensitive to photo-periodism.
• More light intensity favors in tillering and grain filling.
• Cloudy weather with high RH and low temperature leads to rust attack.

b) Temperature :

• Wheat requires vernalization i.e. it should be exposed to cool temperature during seedling stage to induce flowering.
• Optimum temperature of seed germination growth and development is 20-25 ⁰
• Temperature above 25 ⁰C during ripening phase reduce grain filling.

C) Rainfall :

• For normal varieties 250-300 mm is optimum total rainfall and for hybrid varieties 500 mm water is required.
• Change in rainfall pattern affect total area under wheat.