Explanation:

Barley may be grown in subtropical climatic condition. The crop requires around 12-15 0C during growing period and around 30 0C at maturity. It can not tolerate frost at any stage of growth and incidence of frost at flowering at highly detrimental for yield.

Rice crop needs a hot and humid climate. It is best suited to regions which have high humidity, prolonged sunshine and an assured supply of water. The average temperature required throughout the life period of the crop ranges from 21 to 37º C. Maximum temp which the crop can tolerate 40C to 42 C.

Millet - It is a rainfed crop mostly grown in moist areas which hardly needs irrigation. This crop requires moderate rainfall of 30-100cms and high temperatures ranging from 20 to 32°C. Both excessive moisture and prolonged drought are harmful. Well drained light soils are ideal.

In its wild state, tea grows best in regions which enjoy a warm, humid climate with a rainfall measuring at least 100 centimetres a year. Ideally, it likes deep, light, acidic and well-drained soil. Given these conditions, tea will grow in areas from sea level up to altitudes as high as 2,100 metres above sea level.