Abstract: 19 tested naked seed cotton hybrid combinations were made to study the yield hybrid vigor by using 5 excellent synthetic performed naked seed cotton materials and 17 normal cotton varieties seed with fuzz as parents.The results show that the average mid -parent heterosis and over -parent heterosis of lint yield of tested naked seed cotton hybrid combinations is positive,hybrid vigor of tested hybrid combinations whose female parents are naked seed varieties is better than male parents in seed cotton yield and correlativity of bolls.The average mid -parent heterosis of lint percentage and single bill weight is positive.The average over -parent heterosis,over -parent heterosis and over -standard heterosis of seed index is negative.19 tested naked seed cotton hybrid combinations are screened out 8 excellent synthetic performed hybrid combinations whose average over - standard heterosis of yield properties are all above 5 %.

Key words: Nakedseed, Yield, Hybridvigor

CLC Number: 

• S565.03