Cassava breeding program
1990
Chareinsak Rojanaridpiched | Piyawuti Poolsanguan | Jumlong Jeamjamnanja (Kasetsart Univ., Bangkok (Thailand). Faculty of Agriculture. Dept. of Agronomy)
1. Second year selection of cassava. Selection was based on plant type, root yield and root starch content. As a result the total of 76 clones were selected. Among these, 8 clones were edible type. 2. Preliminary yield trial of cassava. Which separated into 3 trials. Four clones were selected for further standard yield trial for 1990-1991. Eight clones were selected for another preliminary yield trials. 3. Standard yield trial of cassava. By using yield potential and root starch content as selection criteria, the best clone was MKUC 28-77-3.4. New cassava variety, Sriracha 1. Previously numbered MKUC 27-3-23 clone, is the cross between MKUC 2-162 clone and 'Rayong 1' cultivar. The outstanding characteristics of Sriracha 1 are as follows: It has similar fresh root yield to Rayong 1. Sriracha 1 gave better root and starch yields than Rayong 3 whereas root starch content was similar. In addition, varietal stability analyses against environments revealed that Sriracha 1 was more stable in dry root yield and starch content than Rayong 1. Insofar as fertilizer responsiveness was concerned, this study revealed that Sriracha 1 gave higher dry root yield than Rayong 1 and Rayong 60 at all fertilizer rates.
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