Hydrogen and oxygen: essential. Hydrogen and oxygen synthesize water, and water is the most indispensable thing for expansion. If there is a lack of water when the fruit is swollen, then the swelling of the fruit will be impossible to say. At the same time, hydrogen and oxygen also build a variety of organic matter on fruits such as sugar and protein, so it is a very important two elements. Nitrogen: supplement in moderation to increase sweetness. The sweetness of the swollen fruit is generally low, and the sweetness of the strawberry only begins to appear in the late ripening period. At this time, proper control of nitrogen can increase the sweetness of the fruit. Nitrogen is also an element that synthesizes plant growth hormone, but once the nitrogen is excessive, it will cause the strawberry to grow too long and cause the fruit to swell and decrease. Mastering the right amount of nitrogen is the key to fruit expansion. Zinc: The fruit expansion effect is good. The use of zinc can increase the local IAA content of plants. At the same time, zinc's ability to transfer is not strong. If it is only used on the fruit, it can enhance the fruit as a metabolic active part for nutrient snatch and play a better role in expanding the fruit, but at this time there must be enough organic matter as a support That way, it can play a better and more effective fruit expansion effect, otherwise there will be a risk that the fruit will become hollow after the fruit is expanded or the fruit will have a reduced ability to resist the external environment. Spraying zinc fertilizer as a whole will increase the content of IAA to a certain extent, can make up for the weakness of the seeds to a certain extent, and obviously prevent the formation of large and small fruits. Magnesium: an important component of chlorophyll. Magnesium is a medium and trace element necessary for strawberry growth and development. It is an important component of chlorophyll and can activate various enzymes and nucleic acids in the process of photosynthesis and respiration. Magnesium is a movable element. In the absence of magnesium, symptoms first appear on old leaves, the edges of the leaves become yellow, brown and scorched, veins fade to green, and dark brown spots appear; in the later period, scorch is aggravated and dark brown spots develop into necrotic spots. In addition to the leaves, the lack of magnesium in the fruit period can also affect the yield and quality of strawberries, making the fruit taste lighter, the hardness lower, and the phenomenon of albinism. Disclaimer: Some articles on this website are transferred from the Internet. If you have third party legal rights, please inform this website to deal with them. phone covid19 Anesthesia Medical Co., Ltd. , https://www.sinoanesthesia.com