In the middle of citrus growth, the fruit becomes smaller, harder, thicker, less fruity, the leaf color turns brown or even yellow, and there are yellow spots on the tender leaves. These are all caused by the lack of boron in the orange orchard. Full attention should be paid to the symptoms caused by boron deficiency during citrus growth. In terms of prevention and control measures, the following points should be taken care of: 1. The orange orchard should use adequate organic fertilizer. In the fruit harvesting fertilizer and winter fertilizer after the citrus harvest, the use of human manure, cake fertilizer or retorted and fermented crop straw fertilizer must be promoted, because organic fertilizer is one of the main sources of boron in the soil. Organic fertilizer contains high organic matter, and soil with high organic matter content also contains more water-soluble boron. Generally, 50 to 75 kilograms of pig manure or decomposed soil mixed fertilizer should be applied to each adult citrus tree every year. For the key boron-deficient sloping orange orchards, 50 grams of borax should be applied to each plant on the basis of reapplication of organic fertilizer. From left to right, sprinkle borax evenly on the soil around the tree disc, and then apply organic fertilizer and cover the soil. 2. Apply soil agent holding boron once a year. Apply 5-10 grams per plant, combined with strong fruit to promote shoot fertilizer. Dig circular or radial trenches along the drip line of the crown of the fruit trees, apply N, P, and K fertilizers, and then cover the soil. 3. Do a good job of foliar spraying. The focus is on the initial flowering period, the fruit expansion period of the young fruit and before the fruit harvest. Concentration sprayed during flowering: 0.2%～0.3% of Sulebor, to increase the pollination and fertilization rate of flowers, and promote the absorption of new leaves; spray concentration of Sulebor between 0.1% and 0.2% in the young fruit period to stabilize The role of the fruit; the concentration of the fruit during the swelling period is about 0.1%; the concentration before the fruit harvest is selected at about 0.1%, which can promote the differentiation of flower buds and lay the foundation for the next year's harvest. If there is no Suleboron, you can use borax instead. The general concentration of borax: 0.3% for budding and new shoot extraction period, and 0.05%+0.5% urea and 0.3% potassium dihydrogen phosphate for spraying during blooming period; The fruit concentration is sprayed with a mixture of 0.1% + 0.5% urea and 0.3% potassium dihydrogen phosphate. It can not only deepen leaf color and strengthen photosynthesis, but also help fruit expand, increase the sugar content of fruit, increase yield and improve quality. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone Antigen Sars Poct Test,Sars-Cov-2 Antigen Test,Covid-19 Antigen Rapid Test,Covid-19 Igg Igm Antibody Test Wuxi BioHermes Bio & Medical Technology Co., Ltd. , https://www.biohermesglobal.com