Reasons and preventive measures for Shatian pomelo blooming but not bearing fruit
During the growth of Shatian pomelo, farmers often encounter the problem of blooming but not bearing fruit, which causes relatively large losses to farmers. So what causes Shatian pomelo to bloom but not bear fruit? What measures should farmers take to prevent it? Let's learn about it together.
1. Lack of pollinator trees
The self-pollination fruit-setting rate of Shatian pomelo is low. If pollinator trees are lacking, there will be a large number of flowers, but the fruit-setting rate will be very low, so cross-pollination can significantly increase the fruit-setting rate. Therefore, pomelo tree varieties with a large amount of pollen, strong pollen viability, and a flowering period close to that of Shatian pomelo should be selected as pollinator plants, so that the proportion of pollinator trees in the whole orchard reaches about 10% to 15%. In addition, artificial pollination can also significantly increase the fruit-setting rate of Shatian pomelo, but it is relatively cumbersome, or keeping bees in the pomelo orchard during the flowering period can also promote pollination and significantly increase the fruit-setting rate.
2. Adverse weather during the flowering period
If there is continuous rainy or low-temperature weather during the flowering period, or if the orchard soil is dry or the air is dry, it is not conducive to fruit setting. When Shatian pomelo experiences long-term low-temperature and dry weather in winter, when the temperature rises, the root system will slowly return to normal growth. At this time, fully decomposed farmyard manure needs to be applied, diluted into a thin water-fertilizer for application. Be sure to avoid excessively high concentration, which can damage the roots and affect the sprouting of new roots. In addition, quick-acting nitrogen fertilizer should also be strictly controlled, especially for fruiting trees and leggy trees.
3. Damage from pests and diseases during the flowering period
If Shatian pomelo is damaged by pests such as citrus blossom midge and scarab before flowering, and if control is not thorough, fruit setting will be seriously affected. Therefore, during the flowering period, control of citrus blossom midge and scarab should be strengthened. To control citrus blossom midge, when the flower buds just turn white, after loosening the soil around the tree disk, immediately apply pesticide on the ground and spray the tree canopy. For ground application, carbaryl powder or phoxim can be used, and for canopy spraying, pyrethroid pesticides can be used. Alternatively, before the adults emerge from the soil, plastic film mulching can be used so that the adult citrus blossom midges cannot fly out from underground and die underground. Scarabs are harmful during the flowering period. The flowers secrete nectar and aromatic substances, which often attract scarabs. Pesticides can be sprayed before flowering or scarabs can be manually captured during the flowering period.
4. Improper fertilizer and water management
Improper fertilization can also affect the fruit-setting rate. Fertilization should combine soil application and foliar application. Generally, furrow, hole, or radial fertilization is used. Fertilizer and topsoil should be mixed evenly and then applied in layers, and soil should be covered after fertilization. When the plant lacks trace elements such as boron and magnesium, foliar fertilizer can be sprayed to supplement them. It should be noted that the organic fertilizer applied must be fully decomposed, and when applied, it should be mixed evenly with soil in layers to improve fertilizer utilization and avoid burning the roots.
The above is an introduction to the reasons and preventive measures for Shatian pomelo blooming but not bearing fruit. I hope it can help you. If you want to learn more related knowledge, please follow us.