Blueberries belong to the Rhododendron family and are perennial shrubs and berries. The appearance of blueberry fruit is blue coated with a layer of white fruit powder. The delicate flesh of the fruit has the functions of preventing aging of the brain nerve, protecting eyesight, strengthening heart and resisting cancer. Spring is the season of blueberry blossom and it is essential for fruit production. So how do you manage blueberries in the spring? Membrane covering weeds After the Qingming period, blueberries can be covered with mulch. The mulch film looks thin, but the effect is considerable. In spring, when the temperature is low and the film is covered, the temperature of the soil layer can be increased by 1 to 6°C, and the maximum temperature can reach 8°C. Due to the strong airtightness of the film, the evaporation of soil moisture can be reduced after the film is covered, the soil temperature can be stabilized, and the soil can be kept moist for a long time, which is beneficial to the growth of the root system. The mulching film has the function of warming and moisturizing; it can accelerate the conversion of humus in soil into inorganic salt, which is conducive to crop absorption; it is conducive to the proliferation of soil microorganisms, and can increase the nitrogen by 30%-50% and increase the potassium by 10-20% after covering the plastic film. Increase phosphorus 20% -30%. †Another major advantage of cover film is weeding. The only silver black mulch on the top of the film is silver gray and the bottom is black. Silver gray has a certain reflective effect, compared with the black plastic film, the ability to absorb heat is low, will not burn blueberry seedlings. At the same time, the plastic film blocked the light, and the weeds under the mulching film did not perform photosynthesis and played a role in weed control. There are many benefits of mulch film coverage, but the spring temperature changes quickly, plastic film coverage time should not be too late. Blueberry seedlings transplanting time is generally around January, covering the film is too early, easy to cause the roots no longer deep grip and stay in the ground in the soil layer, so that the blueberry growing trend appears to be "top-heavy; shallow bottom light" situation; late cover film, then Deep roots can be rooted to promote plant growth. Drip irrigation saves time and effort Chongqing is prone to spring drought, and insufficient rainfall is the main cause of spring drought. Blueberries like a moist environment, and lack of water can easily affect the growth of blueberries. The drip irrigation pipes were installed in the blueberry fields. Each pipe had a small hole every 30 cm. The irrigation water dripped from the small holes to the blueberry roots. A pipe can irrigate 20 acres per hour, saving time and effort. Drip irrigation can not only save water, but also does not damage the soil structure. It is only necessary to drip irrigation or drip irrigation on the base of the plant, and the end is closed. The other end can be connected to the water supply pipeline. Whether or not blueberries need to be irrigated depends not only on the appearance of the plant, but also on the moisture content of the soil. The vigorously growing shoots have a long un-lignified part at the top, and the conducting tissues are not well-developed. Different degrees of wilting are prone to occur under the hot sun. This is a normal phenomenon and does not necessarily indicate that the soil is deficient in water. At this time, if it is irrigated, it will lead to excessive water, which is unfavorable for blueberry growth. On the contrary, in the period when the growth of new shoots is temporarily suspended, the branches and leaves have certain hardness. Even if the plants are short of water, they will not show wilting. When the water shortage is serious, the branches and leaves will suddenly burn. Therefore, irrigation should be before the young leaves appear wilting. During the spring drought period, it is generally possible to irrigate once every 1-2 days to ensure that the weakest plants can fully absorb water. Anti-excessive fertilization in spring Blueberry is an oligotrophic plant. Compared with other fruit trees, the content of nitrogen, phosphorus, potassium, calcium and magnesium in the tree is very low. In winter, when planting blueberries, the soil has incorporated organic matter. Therefore, the fertilization in spring should pay attention to prevent excessive. Nitrogen, phosphorus, and potassium fertilizers are the main fertilizers that blueberries need. Blueberry seedlings do not absorb nitrate fertilizers easily. When applying nitrogen fertilizers, ammonium nitrogen has stronger absorption capacity than nitrate nitrogen. Therefore, when top dressing in spring, it is better to apply ammonium nitrogen fertilizer such as ammonium sulfate. Ammonium sulphate also has the effect of reducing soil pH. For blueberries, sand and calcium are particularly moderate in soils with low pH. Phosphate fertilizer is also an essential fertilizer for blueberries, but fertilization has to be moderate. When the phosphorus content in the soil is high, increasing the phosphate fertilizer will not only increase the yield, but will delay fruit ripening. Generally when the phosphorus level in the soil is lower than 6mg/kg, it is necessary to increase the application of phosphorus pentoxide 15~45kg/ha. Potash significantly increases the yield of blueberries, improves blueberry fruit quality, and enhances plant resistance. However, excessive application will result in small blueberry fruit and lack of magnesium in the plant. When the fruit matures, the rapidly growing new leaves of the shoot will tend to yellow and eventually become red. It is noteworthy that for blueberries, chlorine is a toxic element. When chlorides are poisoned, chocolate stains appear at the center of the upper surface of the middle leaves of the branches, and the leaves at the base of the shoots are yellowed. As the poisons increase, the yellowing grows along the edges of the leaves. Top down. Therefore, when topdressing blueberries in spring, avoid using chlorine-containing fertilizers such as ammonium chloride and potassium chloride. We can create the local Japan taste with Lishida Unagi Sauce!It is made from high quality non GMO soy sauce,sugar,wheat and other ingredients.It's mainly used for coloring and seasoning,especially great for seasoning grilled unagi,barbecue,grilled seafood and as a dipping sauce for sushi and salmon. 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