http://www.indg.in/agriculture/agricultural-best-practices/organic-production/red-gram

Organic production techniques- Cropping pattern

Red gram is often intercropped with sorghum, pearl millet, maize, sugarcane, soybean/cowpea or cotton either during or in alternate season with main crop. Sowing of one/two lines of red gram after every 4-8 rows of cotton is widely practiced in cotton growing areas. Under organic management, red gram intercropped with soybean/cowpea and Moong have been found to be enriching the soil significantly. This combination can also be used in the first year of conversion of conventional farms to organic for making the soil live and fertile.