Articles
EARLY EVALUATION OF YIELD, SPEAR WEIGHT, AND SPEAR-HEAD TIGHTNESS IN ASPARAGUS CULTIVAR TRIALS
Article number
415_15
Pages
97 – 104
Language
Abstract
An international asparagus cultivar trial (IACT) and a line selection trial were conducted in Hokkaido from 1985 to 1992. In the IACT, 13 cultivars, including two Japanese cultivars, were individually evaluated in four replicate experiments, each with 30 plants.
In the line selection trial, 15 lines and cultivars were individually evaluated with 25 plants each.
In November 1988, stem diameters of all stalks of ten plants per plot were measured and the squares of their diameters were summed.
Young spears were harvested every year from early May for two to eight weeks, from 1989 to 1992. Sums of the squared diameters in 1988 and accumulated yields for the four years were significantly correlated in the line selection trial but not in the IACT. In the IACT, the correlation coefficient between the yield in 1989 and the accumulated yield during the four years was significant at the 5% level.
The coefficient of correlation between the average spear weight in 1989 and that during the four-year harvest was also significant in both trials.
The average spear-head tightness indices of marketable spears in 1989 were significantly correlated with those during the four years in both trials.
The coefficients of correlation for yields, average spear weights, and the spear-head tightness indices between the second year of harvest (1990) and the four-year average was highly significant in both trials.
In the line selection trial, 15 lines and cultivars were individually evaluated with 25 plants each.
In November 1988, stem diameters of all stalks of ten plants per plot were measured and the squares of their diameters were summed.
Young spears were harvested every year from early May for two to eight weeks, from 1989 to 1992. Sums of the squared diameters in 1988 and accumulated yields for the four years were significantly correlated in the line selection trial but not in the IACT. In the IACT, the correlation coefficient between the yield in 1989 and the accumulated yield during the four years was significant at the 5% level.
The coefficient of correlation between the average spear weight in 1989 and that during the four-year harvest was also significant in both trials.
The average spear-head tightness indices of marketable spears in 1989 were significantly correlated with those during the four years in both trials.
The coefficients of correlation for yields, average spear weights, and the spear-head tightness indices between the second year of harvest (1990) and the four-year average was highly significant in both trials.
Publication
Authors
A. Uragami, M. Nagai, H. Yoshikawa
Keywords
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