Summary
Over 150 varieties of cassava have been collected from indians and small holders during the last 3 years. Initial experiments already have identified some with interesting characteristics. 1 — A yellow variety (IM 171) with 3,2 mg carotenoids/100g of root. 2 — IM 097 capable of yielding more than 5 kg of root/m2/year when well fertilized on a yellow Latosol. 3 — IM 159 capable of yielding 7 kg of root/m2 in only 7 months on the fertile varzea. 4 — IM 176 with some tolerance to Root Rot (Phytophthora drechsleri).