Studies on the Cultivation of Yacon(Polymnia sonchifolia). (VII). Influence of the number of times of weeding on the growth and yield of yacon.:(VII) Influence of the number of times of weeding on the growth and yield of yacon
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Tuberous roots of yacon (Polymnia sonchifolia) contain a large amount of oligofructans. They have a growing interested as a physiologically functional food and a raw material of oligofructans. Then it is necessary to establish yacon cultivation technique.We tested on the influence of the number of times of weeding on the growth and yield of yacon on a Light-colored Andosol field.Three experimental plots were made: four times of weeding plot (4 times plot), two times of weeding plot (2 times plot) and non-weeding plot. There replications were made on each plot.The results were as follows:1) The main stem length at harvest time was 112.2cm/plant in 4 times plot, 104.6cm/plant in 2 times plot and 91.1cm/plant in non-weeding plot.2) The top dry weight was produced 89.7g/plant in 4 times plot, 80.4g/plant in 2 times plot and 26.4g/plant in non-weeding plot.3) The largest leaf on the main stem on September 1 and after that was always the largest in 4 times plot, and the smallest in non-weeding plot.4) In each plot, the relative illuminance at the base of the plants were the lowest on August 4, but at the top of the plants in non-weeding plot, it was the lowest on September 2.5) The yield of yacon tuberous roots in the weight was produced 1772.2g/plant in 4 times plot, 1522.9g/plant in 2 times plot and 175g/plant in non-weeding plot.6) The correlation of the top dry weight with the yield of the tuberous roots in the weight or numbers were very high and the correlation coefficient were over 0.99.7) These results suggested that the weeding in yacon cultivation would be valuable work espcially early growing stage, and it must do three or four times by the beginning in September.
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