Variety evaluation for the high elevation agroecology
1995
Ganga, Z.N. | Badol, E. (Northern Philippines Root Crops Research and Training Center, La Trinidad, Benguet (Philippines))
In the first group, a total of 145 sweetpotato clones were evaluated in observational trials in several farmers' fields ("kaingin" or shifting cultivation). Among insect pests, beetles was the most important, followed by leaffolders and katydids. Majority were infected with Cercospora leaf spot and only a few were infected with scab. A 30 percent rodent damage was noted. Farmers tend to select new cultivars which are "similar" to their own cultivars. Their selections can be grouped into three: 1) red skinned, high yielding and with good eating quality for market, 2) white skinned, high yielding with very good eating quality for households use, and 3) high yielding and with good herbage yield for swine feeds. In farmers' trials in the post-vegetable environment, 25 varieties were selected out of 78 varieties evaluated. The bases of selection were herbage and root yield, texture and flavor after cooking, color of skin and flesh, oxidation rating and dry matter content. Storage root yield, along with skin and flesh color, were the most important criteria used by farmers. Their preference for the qualitative traits was apparently influenced by market demand, rather than personal preferences. At the La Trinidad experiment station, 20 clones - 14 from Observational Trial and 6 from Advanced Observational Trials - were selected out of 48 clones. Majority of the selected clones have potential for table or fresh market; while the rest are suitable for processing. In the advanced observational trial, none of the clones evaluated gave a significantly higher yield than Dakol (local check)
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