What is the impact of high temperature weather on passion fruit, and what are the prevention and control measures?
What is the impact of high temperature weather on passion fruit, and what are the prevention and control measures?
1. High temperature affects fruit setting. Excessive temperature during the flower bud stage will affect physiological metabolism, lead to imperfect flower development, pollen tube shrinkage, and affect flower pollination, fertilization and fruit setting. On the day of flowering, the higher the temperature, the lower the fruit setting rate. There is a negative correlation between temperature and fruit setting rate.
2. Measures: Build a flat-top frame. The flat-top frame can cover the branches and leaves very well, usually reaching a coverage rate of about 80%. It can reduce the solar radiation heat of the ground soil, reduce the field heating rate, and increase the air humidity to a certain extent, thereby increasing the fruit setting rate of passion fruit.
3. Pay attention to fertilization. Fertilization is the main way to obtain nutrients for passion fruit growth. When topdressing, pay attention to the proportion of nutrients in the fertilizer to ensure the diversity of fertilizers and provide sufficient growth nutrients for passion fruit. Because during the flowering period of passion fruit, if the temperature is higher than 30 degrees, the pollination and fertilization of passion fruit will be very unfavorable. Therefore, during the flowering period, if the temperature is too high, spray water in time to cool down. Artificial pollination can be carried out during flowering to increase the fruit setting rate.
4 Artificial water spraying: When the daily temperature is above 30℃ during the flowering period of passion fruit, it will seriously affect the pollination of passion fruit. When the weather is hot at this time, you can spray water on the passion fruit orchard to cool down and humidify it from 9:30 to 10:30 in the morning. If the atomization effect is good and artificial pollination is performed during flowering, the fruit setting rate can be greatly improved.
5. High temperature will speed up breathing and consume more nutrients. The roots need to be supplemented with organic water-soluble fertilizers such as humic acid or alginic acid, and the roots need to be drenched 500 times. If you are preparing to promote flowers, you should add high-phosphorus and potash fertilizers and calcium and magnesium medium-element fertilizers, and also add zinc, boron and other trace element foliar fertilizers to the leaves.
6. After the passion fruit orchard ground is exposed to the sun, the temperature will be high and the heat dissipation will be slow. Some grass can be planted appropriately. It can lower the soil temperature, reduce soil water evaporation, and ensure water supply to a certain extent, thereby preventing passion fruit from being affected by water shortage and affecting the fruit setting rate. Allow the leaves to cover the surface of the fruit properly. During the cultivation of passion fruit, shelf cultivation is generally used. A certain number of leaves can shield flowers and fruits from direct sunlight and protect flowers and young fruits. Use shade netting. In places where the temperature is too high, you can use sunshade nets to directly block the scorching sun while maintaining good ventilation conditions. Fruit bagging. Bags are commonly used on many fruits to protect them from the scorching sun and prevent pests and diseases.