Cassava cultivars and breeding research in Vietnam
1996
Tran, Ngoc Ngoan | Tran, Ngoc Quyen | Hoang, Kim | Kawano, Kazuo
The results of a cassava cultivar survey revealed a certain regional trend in farmer's use of cultivars. However, four cultivars, i.e. Xanh Vinh Phu, HL-23, HL-20 and HL-24, are widely grown in nearly all parts of the cassava producing regions from the North to the South. One important feature for successful cultivars appears to be the storability of planting material. The evaluation of indigenous cultivars confirmed the superior yielding ability of HL-20, HL-23, HL-24 and Xanh Vinh Phu over other local cultivars. HL-20, HL-23, HL-24 and Xanh Vinh Phu are all "sweet" cultivars. A collaborative varietal improvement program with CIAT start in 1988 and clonal and seedling selections of the materials introduced from Thailand and Colombia are now centered at the Hung Loc Research Center of the Institute of Agricultural Science (IAS) in the South and at the Agricultural College No. 3 (AC no.3) in Bac Thai in the North. A network of on-farm trials was established by IAS in the South and a similar network is being established in the North jointly by AC no.3, the Food Crop Reseach Institute (FCRI) and the Potato and Vegetable Research Center (PVRC) of INSA. Initial results are highly promising in that some advanced Thai clones are showing yielding ability and root starch content far superior to the best local cultivars, both in the experiment stations and in farmers' fields. It is important to determine whether the Vietnamese cassava production is ready to adopt highly efficient but "bitter" cultivars, which can be selected more readily than dual purpose "sweet" cultivars.
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