1. Wheat: It grows better in the prairie and steppe regions and areas with areas with temperate climate. Ideal temperature is between 15 and 20 C and loamy soils with good drainage are suitable. Rainfall of about 75 cm or irrigation is required.Chief producers are China, India, USA,France and Russia.
2. Rice: A crop of humid and hot-to-warm climates, it is grown mainly in regions of tropical monsoon climate. It requires a temperature of about 20 C to 27 C, a clay-rich alluvial soil with good water retention capacity and a rainfall of about 100 cm or assured irrigation facilities. Chief producers are China. India and Indonesia.
3. Maize: This is the most important crop among coarse grains. It is native of America where it is known as corn. It grows best in areas having 18 to 27 C temperature and 60 to 70 cm rainfall. Loam to sandy loams are ideal soils.Chief producers are USA, China, Brazil, Mexico and Nigeria.
4. Millets: This group of crops includes jowar, bajra and ragi. These crops are grown in areas of low rainfall and poor. Most of the millets are grown in tropical regions with a rainfall of up to 60 cm. Chief producers are India, Nigeria and China.
5. Barley: It is a rich source of protein and can be grown in all those areas where wheat can be grown. Chief producers are Russia, Canada, Germany and Ukraine.
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