When to use leaf fertilizer, what problems can be solved In addition to relying mainly on roots to absorb nutrients from the soil, the crop can absorb nutrients, but it cannot replace root fertilization. Foliar fertilization is mainly used to help crops supplement some micro-nutrients or growth regulators, which is also necessary to increase crop yield and improve quality. In addition, under certain special circumstances, such as the late stage of the field crop reproductive growth stage is also an important period of yield formation, fruit and other parts of the ground lack of calcium and boron and other micronutrients, and this time the root activity decreased, nutrient absorption capacity weakened, This needs to be supplemented by foliar fertilization; in addition, when there is no irrigated condition in the surface soil during hot and dry seasons, the effective nutrient transport in the rhizosphere soil is not smooth; or in the plots of stagnant water, the crop roots are deficient in oxygen, leading to crops In special circumstances where normal absorption is not possible, foliar fertilization should be used. Therefore, the main problem solved by foliar fertilization is the supply of trace elements. Second, it is to ease the difficulty of roots to absorb nutrients temporarily. What are the advantages and disadvantages of foliar fertilization? The leaves absorb faster than the roots and can quickly provide nutrients to the plants. However, the shortcoming is that the amount of application is limited and the effect is short-lived. The efficiency of leaf nutrients is related to the structure of the leaf, and the leaf has low permeability to mineral nutrients, especially thick-corned leaves, such as olive leaves, citrus and coffee leaves. Fat droplets do not easily penetrate the leaves, and the droplets of the liquid fertilizer slide down from the surface and cause loss. If it rains quickly after spraying fertilizer, the rain will lose liquid fertilizer. Fertilizer spraying in high temperature and high temperature will cause the fertilizer solution to dry quickly on the leaf surface. These conditions may reduce the effect of foliar fertilization. The advantages of foliar fertilization are: direct supply of nutrients, avoiding the fixation and degradation of nutrients in the soil, and the efficiency of nutrient utilization is higher than that of soil fertilization. Its disadvantage is that the fertilizer effect is transiently limited. It is a kind of assisted fertilization method. How to master the techniques of foliar fertilization Select fertilizer composition, foliar fertilizer is mainly the supply of trace elements, but the combination of a large number of trace elements is conducive to the absorption and utilization of nutrients. To determine fertilizer types, one needs to look at the needs of crops; the other is to look at soils to limit nutrient types; to improve the targeted application of foliar fertilizers, do not choose Shiquanda rehydration solution, which is expensive and untargeted, and the effect is not good. For example, to solve the chlorosis of the new peanut leaves in northern China, it is necessary to spray iron, etc.; to increase the 1000-grain weight of winter wheat, spray urea and potassium dihydrogen phosphate. The concentration of leaf fertilizer should be set. If the concentration is too high, the leaves will be damaged, but the fertilizer effect will be reduced. Low concentration does not work. Spraying fertilizer time and weather conditions should be selected, for example, to avoid spraying fertilizer before rain; growth period should be selected critical period of nutrient efficiency. The frequency of spraying fertilizer is generally more than 2 times before spraying, and the specific number of times depends on the effect. Does apple spray calcium reduce bitter pit disease? Through experimental research, it has been found that the phenomenon of calcium deficiency in apple fruits is relatively common. The period of 3-6 weeks of young fruit development is the peak period of calcium absorption of fruits and the critical period of calcium nutrition in apples. This period must ensure that the young fruits have sufficient calcium. Only nutrition can prevent the occurrence of bitter pit disease. To this end, agricultural personnel promoted the application of calcium spray to prevent apple bitter pit disease in some high-yield apple orchards in Shandong and Shaanxi. The essential point is that when young fruit grows to 2-3 cm in diameter, or after a month of falling flowers, the masses call the first time calcium spray when the lanugo hairs recede. The calcium fertilizers can use conventional calcium chloride and calcium nitrate, as well as new varieties on the market such as calcium sugar alcohols and calcium amino acids. The calcium concentration is about 0.1-0.3%, and the spraying times are generally 3-5 times. Some orchards sprayed 2 times before bagging, and then sprayed 2 times. Each interval was 5-7 days. The number of sprays depends on the effect. Such calcium spraying measures have obvious effects on preventing and reducing apple "bitter bitter disease". In recent years, with the trend of orchard soil acidification, the symptoms of apple trees caused by calcium deficiency have become increasingly obvious. In addition to the application of calcium fertilizer in apple production, the application of calcium fertilizer has become increasingly widespread. Frozen Flower Squid,Flower-cut Squid,Frozen Flower-cut Squid ZHOUSHAN GENHO FOOD CO.,LTD , https://www.genho-food.com