Studies on the Cultivation of Yacon. IV Influence of planting times on the growth and yield of yacon.:(IV) Influence of planting times on the growth and yield of yacon

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Tuberous roots of yacon (Polymnia sonchifolia) contain large amount of oligofructans. They drew great attention as raw materials for the extraction of oligofructans. So, it is necessary to the establish yacon cultivation techniques.We have done an experiment on the date of planting for the growth and yield of yacon.Planting were done on April 10, April 20, April 30 and May 10. Four replication were done at each planting.The results were as follows:1) The average soil temperature (10cm in depth) of the last ten days of April was 15.8°C.2) Growth of yacon in all stages of April 10 planting was slow but the best in April 20 planting.3) The top fresh weight was the lowest in April 10 planting but the highest in April 20 planting.4) The yield of yacon tuberous roots in the weight and numbers were the lowest in April 10 planting but the highest in April 20 planting.From the yield of yacon tuberous roots in each planting, it was suggested that the last ten days of April would be the most suitable planting time of yacon in this region. And it would be desirable to plant earlier, if the soil temperature rises about 15°C.
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