First, the technical point of ?? A serious lack of boron in the soil (available boron content of 0.13 ~ 0.35 mg / kg) led to abortion of chestnut embryo sac or zygote to stop differentiation, which is the main reason for the chestnut hollow. This project finds simple and easy-to-use and complete technical measures such as reasonable boron application time, method and quantity. (1) Spraying boron during flowering period, the effect of reducing the vacancy rate is sometimes unstable. If boron is sprayed for several consecutive years, the rate of empty sheds decreases year by year, and the effect is significant. (2) For the conditional irrigation chestnut, in the early spring (April), boron is applied to the empty chestnut soil and watered in time. In that year, it can receive the significant effect of reducing the emptying rate and increasing the seed setting rate. (3) The chestnut orchard without irrigation conditions can apply boron in the soil during the rainy season (July, August), dissolve the boron fertilizer with rainwater, and infiltrate into the root system. For the second year, the reduction of the emptying rate has a significant effect. (4) The experiment shows that the boron fertilizer can last for more than 5 years, so it is not necessary to apply boron every year. (5) Boron applied in soil: early spring (April), rainy season (July, August), and autumn (September). Boron method: hole application or ring groove application. Boron dosage: According to the size of the crown, the vertical projected area per square meter is 10 to 15 grams. It is advisable to strictly control the amount of boron used. When it is excessive, it will cause damage to the tree body, affecting the current year and the output of the next few years. Second, the application of the situation? In Beijing Miyun, Huairou, Changping County and Hebei Qiangxi, Zunhua, Xinglong and other counties, the promotion area is gradually expanding. According to incomplete statistics, from 1986 to 1996, in the suburbs of Miyun and Huairou in the suburbs of Beijing, 220,000 strains of boron were applied in the rainy season, totaling approximately 147,000 mu, and the cumulative increase in output was 484,000 kg, with a newly increased output value of 1.8392 million yuan in 1990. Later, the application of boron to increase the seed setting rate has been used as one of the main yield-increasing measures in the chestnut production area, and significant economic benefits have been achieved.
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