BIOMASS PRODUCTION AND YIELD OF RECENT ASPARAGUS CULTIVARS IN SNOW COVER REGION, HOKKAIDO, JAPAN: 3RD IACT REPORT
International Asparagus Cultivars Trials were conducted in Hokkaido, the snow cover region, for 3 years. As well as spear yield, the above ground biomass will be an important resource for bio-energy. The biomass production was also evaluated using the cultivars in IACT. The nurseries of 21 cultivars were planted in the Experimental Farm of Hokkaido University, at 6 June 2007. Above ground biomass of each cultivar was harvested and the fresh weight and dry weight were measured at 13 November 2008. In May 2009, green spears more than 23 cm long in 3 years plants were harvested every day for 23 days and the yield was measured in each cultivar. Besides, top shape of spears was investigated using medium sized spear 5 times during the harvest. The Dutch cultivars such as Gijnlim, Avalim, Thielim and Backlim and the USA cultivar Atlas showed large above ground biomass (AGB) production in 2-year-old plants. These cultivars showed high spear yield in 3-year-old plants and significant correlation was recognized between AGB in 2nd year and spear yield in the 3rd year. The spear yield reached 5.4 t/ha in Gijnlim and Avalim. However, the New Zealand cultivar Pacific 2000 showed a higher yield in spite of small AGB in 2nd year. The USA cultivars showed good tightness in top shape and the frequency of commercial spears was higher than the Dutch cultivars. Especially the frequency of commercial spears was 86% in UC157. Harvest was delayed in violet colored cultivars and their yield was smaller than green cultivars. Hokkaido is an old asparagus production area and the number of asparagus farmers was reduced during the 1980-1990s. However, the number of asparagus farmers has gradually increased recently and presented data is good information for them.
Araki, H., Sarwar, A.K.M.G., Nakano, H., Takamushi, S., Ichikawa, S., Jishi , T. and Hoshino, Y. (2012). BIOMASS PRODUCTION AND YIELD OF RECENT ASPARAGUS CULTIVARS IN SNOW COVER REGION, HOKKAIDO, JAPAN: 3RD IACT REPORT. Acta Hortic. 950, 195-199
biomass, spear yield, cultivar, cool region