Explanation:

Suitable graphical conditions required for wheat cultivation are: 1. Temperature: The temperature required for wheat during the growing season is about 10-15°C, and at the time of harvesting, it is about 25- 30°C. The weather must be warm and moist during the initial stage of the growth and sunny and dry in the later on stages. The average temperature of the hottest month must not exceed 20°C. A frost-free period of 100 days is usually needed, but some fast-ripening varieties can get mature only within 90 days. 2. Rainfall: The quantity of rainfall needed for wheat cultivation varies between 30 cm to 100 cm. The most wheat lands of the temperate regions have an annual rainfall of 38-80 cm. The spring wheat regions of Canadian Prairies only receives approx. Around 46 cm of rainfall, but it comes in the initial summers when the wheat is growing. Wheat is even grown in areas having a lesser amount of rainfall, i.e., around 25 cm. This has been done by adopting the dry farming method. Also, where the irrigation facilities are available, wheat gets cultivated in drylands also. 3. Soils: The soil most suitable for wheat is either light clay or that of heavy loam. The world's best wheat comes from that of chernozem soils in the 'Black Earth' areas of the Ukrainian Steppes, the dark brown soil of North America, and even the grey-brown podzolic soils of the deciduous forest region. 4. Topography: Wheat is grown in the plain as well as in the areas of rolling topography, which provides sufficient drainage and at the same point of time facilities of the use of machinery. The largest commercial wheat lands in the world are the undulating temperate grasslands of Steppes, the Prairies, the Pampas, and the Australian Downs. 5. Economic Factors: The economic factors that favor wheat cultivation are: • Technology • Transport • Capital • Market