Almonds often show one flower fall and three fruit drop all year round. The first time after the flowering period, the flowering began with the fall of the petals. The second time was about one week after the fruit set, the peach fruit began to fall off when it grew to the size of mung bean. The third time was before entering the hard core period, especially during the 20 to 35 days after flowering. The fourth time was the fruit drop before harvest.
It has been observed that in normal years, Chongp'er almonds account for the heaviest fruit drop at 10 days after flowering, accounting for 70% to 90% of the annual fruit drop rate, and the fruit-filling rate for young fruit expansion and hard-core stage accounts for 5% to 10% respectively. %, and peach fruit filling period is very few.
The main reasons for falling fruit and fruit of almonds are as follows: due to abortion or incomplete flower formation of flowers, they cannot be pollinated and fertilized normally. The tree is debilitated and grows poorly. The accumulated nutrients in the tree are low, and the flowers cannot be pollinated and fertilized completely. During the flowering period and the young fruit period, the wind blew, the branches swayed, and the falling flowers and fruit were touched. In early spring, frost damage and night frost make the flowers freeze, especially after the daily average temperature above 7°C is maintained for more than 20 days, any sudden cooling will cause peach damage. During the flowering period, the air is dry and the stigma of the flower organ soon becomes dry and brown, losing the ability to receive pollen and shortening pollination life. Almond flowers are insect-borne flowers and wind-borne flowers (that is, pollinating relying on insects and breeze). In the event of rainy weather and low temperatures during flowering, insect activity is hindered and normal pollination cannot be achieved.
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