Fig. 10.4.

An examination of Fig. 10.4 show that the lower Brahmaputra Valley, West Bengal, Odisha and coastal Andhra Pradesh has the monoculture of rice while in Western Rajasthan, Bajra is the dominant single most important crop. In Punjab and Haryana rice and wheat enter into combination and in western Uttar Pradesh wheat, rice, and sugarcane constitute the combination. In the remaining parts of the country crop combinations vary between four to eight. In these combinations, wheat, rice, maize, gram, barley, ragi, pulses, oilseeds, cotton, sugarcane, bajra, and millets form different crop associations.

Weaver’s method has admirably been accepted and applied for the demarcation of crop combination regions as its application results into suitable and accurate grouping of crops. The technique, however, gives most unwieldy combinations for the units of high crop diversification. This method, however, suffers from the setback of laborious calculations.