Selective Breeding of Asparagus
I. Studies on Selection Methods, Analysis Variance of Variety Components and Superior Plants
Y. W. Chen and Y. C. Jean
1. Selection Methods: (1) Yield of individual asparagus plant is correlated positively with number of stalks and crown size. Medium stalks were found good for yields. (2) Stalks diameter is correlated positively with spears diameter. (3) The height of first branching spears is correlated positively with degree of spear tightness. (4) Mean stalks number is correlated positively with crown size and spears number per plant. (5) There are significantly correlated between yield and height of stalks on U.C. 309 and U.C. 711. These conclusions were based on investigating the plant characters at winter harvest. (6) Plants with taller stalks were more resistant to disease during the summer season. Results of this study would be used for conference and performance on selective breeding.
2. Analysis variance of variety showed 8% for total yield and 7.4% for first grade yield. Coefficients of variation of total yield and first grade yield were 8.38% and 11.25% respectively, for U.C. 309 and were 9.3% and 15.33% respectively, for U.C. 711.
3. After twice selection for superior plants, 102 and 106 plants were selected for U.C. 309 and U.C. 711, respectively. Each of the superior plants was cut into 5 to 10 segments, which were planted on February 1976 for the continuation of this experiment.