The fact that Brown plum blossoms are not fruitful or fruitless is generally caused by the following reasons: 1) Flowering in low temperatures or rainy days leads to poor pollination and decreased pollination rate. 2) Lack of certain pollination varieties. Most of the plum varieties are self-infertility infertility, that is, the pollen in the same variety or the same flower cannot be fertilized, and it cannot be achieved. 3) Excessive tree vigor inhibits the reproductive growth of plants, resulting in less flowering and less results. For the above reasons, the following measures can be taken to increase the pollination rate: 1. A certain number of pollination varieties should be allocated when planting. 2. Spray 0.3% Borax + 0.3% Urea + 0.2% Potassium Dihydrogen Phosphate once at full flowering stage and young fruit stage. Third, the appropriate control of nitrogen fertilizer in summer, increasing phosphorus and potassium fertilizers, control of tree vigor, and promote reproductive growth. IV. Artificially assisted pollination: 1) Pollen collection: Collect the flowers that are to be placed or opened, remove the pollen grains and place them under clean white paper, and bake them with a hot plate or ordinary bulb to maintain the temperature at 20-25 degrees Celsius. When the pollen is cracked, yellow pollen is scattered and the pollen shell is screened to receive pure pollen. Pollination pollen is best to have more than one species. 2) Pollination time: Artificial pollination performed best within 4 hours after flowering, and no later than 48 hours after flowering. 3) Pollination method: Add appropriate amount of talc powder (pollen: talcum powder = 1:3) or starch into the bottle for later use. pollination. When pollinating, you can use a brush, or a soft wire like 14-8 or 16-8 cm long lead wire, and a pollinator made of a 1 cm long bicycle valve rubber on one end to pollinate. In addition, where conditions permit, the orchard can be used to increase the pollination rate, and generally one acre needs to be placed in a box of bees. In small orchard orchards, the method of hanging flower pots can also be adopted. That is, the flowering branches of pollinated varieties are cut at the early flowering stage, inserted in the water of bottles and cans, and then hung on the trees that need to be pollinated. And often change the hanging tank position, so that the whole plant pollination uniform, from the initial flowering period to the flowering period of continuous hanging twice, the fruit set rate was significantly improved. China Agricultural Network Editor
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