Chestnuts are empty, also known as hollow, empty shells, and fruit growers generally call them "duck chestnuts." According to surveys, the chestnut emptying rate is generally about 15%, the high of 60% -80%, and almost all empty. For this reason, preventing empty spots is the key to improving the yield and quality of Chinese chestnut. According to the practical experience of fruit farmers in our county over the years, the following effective measures can be taken to prevent or reduce chestnut emptying. 1. Rational selection of pollination trees. Chestnut cross-pollination has a high fruit setting rate, and self-pollination is often not easy to achieve. Therefore, when planting, it is necessary not only to use good varieties with a high seed setting rate, but also to pay attention to rational allocation of pollination trees. For example, the main cultivar is Yunong 77-01 (Jiaozaoyou Department), and the pollination cultivars are respectively Kenong 77-02 (Qingzayouyou) and Chenong 77-04 (nine species). . The number of pollination tree configurations should account for about 1/3 of the total number of chestnut trees. Practice has proved that correct selection of pollination combinations can greatly increase fruit setting rate and increase chestnut yield. 2. Remove male flowers properly. Chestnut trees are male and female plants with different flowers. The male inflorescence opens first and the female inflorescence opens later. When the male inflorescence grows to 2-3 cm, removing 90% to 95% of the male flower not only does not affect the normal pollination of the tree, but also leaves a green appearance, high fruit setting rate, increased fruit weight, and can also advance 7-10 days Mature, so that early harvest, morning market. The proper removal of male flowers from platts is a measure to increase production and increase income, especially for trees that have just entered the result period. 3. Increase boron fertilizer. Chestnut is very sensitive to the reflection of boron, especially in the boron-deficient soil application of boron fertilizer, can effectively reduce the rate of open space, increase the yield per plant. Specific application methods: First, the application of boron in the bud, in the early spring combined application of bud fertilizer, the application of borax into the soil, usually 100-150 grams of borax per plant, boron-deficient soil can be more than appropriate; second is the flowering period spray Boron, per 667 square meters (1 mu), uses 150 grams of borax and 50 kg of water and evenly sprays on female flowers. The boron concentration may be appropriately increased for those with high open rates. Chestnut spray boron Boron, the emptying rate can be reduced by 20% -30%, yield increased 3-4 times.
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