Evaluating on combining ability of yield and standard value of several carrot crosses in Lam Dong and Hai Duong province

Abstract

Research on evaluating 55 crosses were created from 11 carrot varieties by diallel cross method according to the Griffing 4 diagram. The experiments were conducted during Autumn Winter season in Lam Dong province 2023 and Winter season 2023 in Hai Duong province. The results showed that all crossings grew and developed well in both ecological regions. The results of evaluating the combination ability identified 4 varieties of D1, D2, D10 and D11 having both high general combining ability (GCA) variances and specific combining ability (SCA) variances. The results of standard heterosis show that: In Lam Dong province, standard heterosis compared to the control variety Supper VL 444 had 22 crosses reached positive values from +0.0 to +21.6%. In which 3 crosses reached highest values were CR23.19, CR23.39 and CR23.49 (from +19.3 to +21.6%). The rest crosses (33 crosses) had negative values (from -17.9 to -0,3%); in Hai Duong province, 14 crosses reached positive values from +0.0 to +20.4% and the remainings had negative values (from -25.5 to -2.2%). 14 crosses were identified with high yields in Lam Dong and Hai Duong province (from 45.0 to 52.6 tons/ha).