Abstract: In this paper, statistical method was applied to the study of the linear correlations between the bisexual flower percentage of ‘Tainong 1’ mango and temperature and humidity variants during and before blossom. The results showed that ‘Tainong 1’mango had a relatively high percentage of bisexual flowers, and the percentage of bisexual flowers rose as the temperature increased. The morphological differentiation of flower organs began around 30 days before blossom (DBB) and ended 5 DBB. The percentage of bisexual flower had a significant and positive linear correlation with the average diurnal highest temperature, the average diurnal temperature, the average diurnal lowest temperature and the accumulated temperature during 6 to 30 DBB. During the period from 26 to 30 DBB, temperature and humidity was vital to the formation of bisexual flower, and relatively higher temperature and suitable humidity would benefit that formation. During the period of 16 to 20 DBB, the percentage of bisexual flower rose with higher average diurnal humidity.

Key words: Mango, Bisexual flower, Temperature, Relative humidity, Accumulated temperature