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Effect of plant density and initial corm size on the corm yield of konjac (Amorphophallus konjac)

The effect on annual konjac corm production of planting heavier corms and increasing plant density was investigated at Pukekohe Research Station, New Zealand. Corm yields were 2.2 times the planted corm weights giving a mean corm weight of 741 g harvested from large corms (325 g) and 334 g from small corms (150 g). The mean corm yield increased 1.5 t ha−1 for every 10 g increase in planted corm weight in the 150–330 g range. Increasing the plant density from 33,330 to 106,670 plants ha−1 had a strong linear effect on corm yield. The total yield of corms and offsets from large planted corms increased by 7.2 t ha−1 for each additional plant m−2 to lift yields from 34.9 t ha−1 to 88.1 t ha−1. For small planted corms, total yields rose from 13.7 t ha−1 to 43.9 t ha−1 giving an increase of 4.1 t ha−1 for each plant m−2 increase. Offset production was 12% of the total corm yield grown from large corms and 20% when grown from small corms with no effect from plant spacing.