The reason for the drop of Flower and Fruit

Raisin is one of the grapes, but it tastes better and sweeter than grapes. It is deeply loved by consumers in the market, but it will drop flowers and fruits during its growth period, which will have a great impact on the yield of grapes. So what is the reason for the drop of flowers and fruits? Let's take a look.

1. Variety characteristics

The flower and fruit drop of some varieties have something to do with its variety characteristics, some varieties have defects in the structure of female flowers, some varieties show signs of stamen degeneration, or the configuration of pollination trees of female flower varieties is unreasonable, which will lead to flower and fruit drop.

2. Physiological fruit drop

In the whole growth process of the raisin, there will be 1-2 physiological flower and fruit drop phenomenon, generally when the fruit grain grows to 3-4 mm, part of the fruit will fall off because of malnutrition, which is called physiological fruit drop.

3. Lack of nutrition

In the early stage of seed growth, if the nutrition of the tree is insufficient, the incomplete florescence is increased, the beads are poorly developed, and the germination rate of pollen is low, resulting in serious fruit drop. In addition, the number of flowers is larger, so the consumption of water and nutrients is also relatively large. In the flowering stage, if there is a lack of trace elements, especially potassium, phosphorus, boron and so on, its pollen energy will decrease, resulting in falling flowers and fruits.

4. Improper management

There is a great demand for water and nutrients in the flower and fruit stage, but if it is not properly fertilized and watered in this period, there will also be flower and fruit drop, such as partial application of nitrogen fertilizer and excessive watering. When the techniques such as plastic pruning and heart-picking fail, the contradiction between vegetative growth and reproductive growth during flowering is intensified, which will also lead to falling flowers and fruits.

5. Bad climate

In the flowering period, the optimum temperature is between 20 and 25 degrees. If the temperature is lower than 10 degrees, it will affect its normal flower bud differentiation. When the temperature is lower than 14 degrees, its flower organ will grow badly and fall off. If the temperature is higher than 35 degrees, the flower organ will also lose water and die. If it rains continuously during the flowering period, the Corolla can not fall off normally, and the anther can not be pollinated normally, which leads to the decline of pollination quality and the drop of flowers and fruits. In addition, if there is not enough light before flowering, the assimilation of its new shoots will be reduced, and the supply of nutrients in the return ear will be tight, resulting in falling flowers and fruits.

The above is the introduction of the reasons for falling flowers and fruits. I hope it can help you. If you want to know more about it, please pay attention to us.