Effects of Greening in Bed of Aeroponics System on Yield and Rotten Rate of Potato Tubers

摘要

This study was carried out to establish the optimum greening method in beds of a aeroponics system for seed potato (Solanum tuberosum L.) production in order to decrease rotten tubers in beds and after the storage. When nutrient solution was suppliedduring greening period 5, 10 and 15 days, tuber yield did not decrease by greening of five days in the beds before the second harvest, but significantly decreased by the greening of more than ten days regardless of growing season. When nutrient solutionwas not supplied for the greening period, tuber yield decreased by greening of more than five days in the beds. Tuber rotten rate at the second harvest was 4.3% in spring culture and 3.2% in autumn culture in the non-greening control plots, but decreasedto less than 2.0% by the greening regardless of nutrient solution supply and growing season. Tuber rotten rate after six weeks of storage was 2.0% in spring culture and 2.7% in autumn culture in the non-greening control plots, but reduced to less than 0.8% in greening plots. These data indicate that greening for five days of nutrient solution supply in the beds can reduce tuber rotten rate without reducing tuber yield.