In Siang district of Arunachal Pradesh, Adi tribe with its sub. group, Gal/ong, Minyong, Boris, Pailibo, Ramos, Bokar etc. accounts a great majority and rice is the staple food of these tribes. Bali is the most important landrace grown by the Adi tribe, which is highly adapted and possesses multiple resistences to disease and pest. The Adi farmers follow monocropping of rice in wetlands/lowlands and mixed cropping of rice with maize, millets and many other crops injhum cultivation. Cereals, especially rice constitutes the major component of the crop mixture (Sarangi and Dey, 2005). Sequential harvesting of crops is an effective way of managing up to 35-40 crop species. Successive harvest of cereals creates additional space for the remaining crops, which also receive humus and nutrients (Mishra et al., 2004). Apart from jhum rice cultivation Adis’ practice of WRC also in lowland/valley land areas where standing water is available. All the agricultural operations from land preparation (by digging with spade) to harvest have been performed manually. In WRC, two types of cultivation are in vogue: kharif and mipun rice cultivation.