The correct method of ginkgo pollination

Male pollen collection requires attention to quality. High-quality male pollen grains are plump, bright yellow, and slightly greenish in color. Pollen is typically collected when the male inflorescence changes from green to yellow, which usually occurs between the Qingming and Guyu periods. To collect it, simply shake the male flowers onto a white sheet of paper, allowing the pollen to fall freely for later use. The flowering sequence of mature ginkgo trees follows a top-down pattern. The main branches bloom first, followed by the lower ones. When about one-third of the flower heads on the lower branches show water droplets, the entire tree is considered mature. This is the ideal time for artificial pollination. To determine the right timing, observe these signs: 1) Ginkgo leaves are roughly the size of a one- or two-cent coin; 2) There are scattered scales on the ground; 3) After the morning dew has dried or around 3 p.m., gently touch the stigma with your fingertip—there should be a fine, silken thread attached. With properly selected male flowers, approximately 15 to 35 kilograms of mature fruit can be produced per 50 grams of pollen. It's important to ensure enough pollinators are present on the tree. If there are fewer flowers, manual pollination should be done carefully to make sure the tree is evenly covered, with half of the branches pollinated and the other half left untouched. Proper ginkgo pollen application does not require drying after pollination. Male flowers are soaked in water for a short period, then filtered through gauze to remove any debris. For each 50 grams of pollen, mix it with 4 to 6 kilograms of liquid solution and spray it evenly. When spraying, start from the top and work downward, covering the outer branches first and then moving inward. Ensure even coverage without missing areas or over-spraying. If heavy rain occurs after pollination, pollen should be reapplied the next day, but in smaller quantities. If the pollen solution cannot be used immediately, it can still be effective if stored for one or two days. Never mix the solution with impurities, and always clean all equipment before use. Avoid spraying any foreign objects on the flowers. In low temperatures (below 20°C), pollinate after morning dehydration. In high temperatures (above 20°C), it's best to pollinate in the afternoon. Seven to ten days after pollination, monitor for leaf roller moths to protect fruit development.

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