Study On The Correlation Between Qualitative Characters And Head-splitting Of Spring Cabbage

To screen splitting-tolerant and high-class spring cabbages, the correlation between eight qualitative characters, petiole-leaf ratio, compactness, head index,width of petiole base,width of petiole 10 cm, central column-head height ratio, dry matter contents and crude fiber contents included, and head-splitting was discussed. Selecting 30 F1 of spring cabbages, we studied five heading characteristics of physiological maturity and their relationship to rate and index of splitting 5, 10 and 15 days after maturity. We used the spring cabbage variety of "Qingan 50" as the material, distilled water as CK,sprayed 0.16 g/L,0.11 g/L and 0.08 g/L 3 concentrations CaO on cabbage, compare difference between 3 treatments. The results showed as follows:1.There is highly significant difference between qualitative characters on different spring cabbage, including petiole-leaf ratio, compactness, head index, width of petiole base, width of petiole 10 cm, central column-head height ratio, dry matter contents and crude fiber contents.2.There is highly significant difference between rate of head-splitting and index of head-splitting on 30 different cabbage combinations.3.Rate of head splitting is significantly negatively correlated with petiole-leaf ratio and head index(r=-0.521, r=-0.692) when delayed 5 d and that width of petiole base and content of dry matter(r =-0.637, r=-0.837) when delayed 10 d. When delayed 15 d, rate of head splitting is highly significantly positively correlated with compactness and central column-head height ratio(r=0.810, r=0.837), but negatively correlated with contents of crude fiber(r=-0.868). At the same time, there were significant or highly significant correlations between index of head splitting and compactness, head index, width of petiole base, central column-head height ratio, dry matter contents and crude fiber contents(r=-0.740, 0.755, 0.863, 0.625,-0.744,-0.636). But there is no signifcant difference between width of petiole 10 cm and character of cabbage head-splitting. In conclusion, spring cabbages with high petiole-leaf ratio, high width of petiole base,low compactness and central column-head height ratio as well as high contents of dry matter and crude fiber will be more tolerant to head-splitting.4. 0.16 g/L, 0.11 g/L and 0.08 g/L three concentration treatments all can reduce significantly character of cabbage head-splitting. 0.11 g/L concentration is the best tolerant to head-splitting. It can reduce rate of head-splitting 51.2% and index of head-splitting54.04. So spraying calcium fertilizer is effective way to prevent cabbage’s head-splitting.