How can fertilization improve the fruit setting rate of big cherry
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(1) Early Application of Flower Bud Differentiation Fertilizer: According to Japanese studies, after 1 month of flower bud differentiation (June 7th), Nongweng applied 2.5 kg of nitrogen fertilizer per flower, and the average flower bud differentiation rate was 34.0%. The seed setting rate was 38.39%. At the late stage of flower bud differentiation (August 7th), the same amount of nitrogen fertilizer was applied. The average flower bud differentiation rate was 6.2%, and the seed setting rate of spring flowers was 34.6%. Without fertilizer, the flower bud differentiation rate was 0.4%. 28.18%; on June 7th, the low-temperature barrier for flowering plants was 2.53%, and 14.01% for non-fertilizers; and on June 7th, the bad flower rates for topdressing were 0.86% and 10.62% without fertilizers. It can be seen that early application of flower bud differentiation fertilizer is an important measure to promote flower bud differentiation, ensure fruit set in the spring, reduce low temperature barriers and reduce stunted flowers, and it is also an important measure to improve the fruit setting rate of large cherry.
(2) Applying basal fertilizer in the early autumn: The amount of basal fertilizer in the main producing area of ​​Yantai large cherries generally accounts for about 70% of the total annual fertilizing amount; it is best applied from mid-September to the beginning of October, which is favorable to increase storage nutrition, and is beneficial to the improvement of cherries. Fruit setting rate.
(3) Strengthen foliar spray: Before and after flowering, spraying 2-3 times of large-scale special liquid fertilizer for cherry, the fruit setting rate is significantly increased, the fruit is large, mature period 3-5 days in advance.