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First, the advantages of foliar fertilization 1, targeted, plant lack of nutrition to make up for what nutrition. In the process of plant growth and development, if a certain element is lacking, its deficiency will be reflected from the leaf surface. In the case of nitrogen deficiency, the seedlings tend to yellow; in the absence of phosphorus, the seedlings are red, and in the absence of potassium, the plants are slow to develop, the leaves are dark green, and finally the orange-red chlorotic spots appear. According to the characteristics of plant leaf deficiency, timely application of supplemental missing elements can improve symptoms.
2. The nutrient absorption is fast and the fertilizer efficiency is good. Generally, foliar fertilization is faster than root absorption, which can replenish nutrients needed by plants in a short period of time. For example, spraying 1%-2% urea aqueous solution on the foliar surface can absorb 1/3 after 24 hours; spraying 2% concentration of superphosphate solution can be transmitted to all parts of the plant after 5 minutes.
3. Supplementary roots are insufficient for the absorption of nutrients. Plants in the roots of underdeveloped roots and late growth stage, poor absorption capacity, through leaf fertilization can strengthen seedlings and promote flower growth.
4, to avoid soil fixation, leaching, improve fertilizer efficiency. Due to the influence of soil pH, water content and soil microbes, the applied nitrogen, phosphorus and potassium fertilizers were fixed and leached, which reduced the fertilizer efficiency. Foliar application can avoid this phenomenon and improve fertilizer efficiency.
5, fertilizer, low cost, easy to operate. Compared with soil fertilization, foliar fertilization is only 1/10 - 1/5 of the amount of soil fertilization. Foliar fertilization can also be combined with spraying pesticides.
Second, the applicable range of foliar fertilization Foliar fertilization can be used in the following situations: 1, the lack of base fertilizer, plant de-fertilization; 2, the plant root system is seriously damaged, root growth is weak; 3, need to quickly restore a nutrient Elemental deficiency; 4, flower cutting propagation process; 5, deep rooted flowers rely on traditional fertilization is not easy to be effective.
Foliar fertilization should use more soluble fertilizer. Nitrogen fertilizer mainly includes urea, ammonium sulfate, ammonium nitrate, phosphate fertilizer such as superphosphate, potassium dihydrogen phosphate, ammonium phosphate, potassium fertilizer such as potassium nitrate, potassium sulfate, etc., and ferrous sulfate. , zinc sulfate, manganese sulfate, copper sulfate, borax or boric acid, ammonium molybdate and other trace elements. In addition, there are various brands of foliar fertilizers produced at home and abroad, such as spray Shibao, Yemianbao, and Shenglingling. The ingredients are complex and variety, and can be used for physiological regulation after spraying. It can also serve the role of nutrition.
Third, the use of foliar fertilization
1. Spraying concentration: Different flower types require different amounts and concentrations, and must be mastered during use to avoid phytotoxicity or other abnormal phenomena. Urea uses 0.1%-0.5% on seedlings, 0.2%-1% on herbaceous flowers, 0.5%-1% for woody flowers, 0.1%-0.2% for ammonium sulfate, and 1% for ammonium nitrate. Calcium is used in herbal flowers: 0.5% - 1%, woody flowers 2% - 5%; potassium dihydrogen phosphate is 0.1% - 0.2%; ferrous sulfate is used in 0.2% - 0.5%. Trace elements are generally used between 0.01% and 0.5%.
2, application time and environmental requirements: the fertilizer solution sprayed on the leaf surface should be kept moist for a certain period of time, can be absorbed into the stratum corneum of the leaf through the leaf surface, and play its nutrient source in the solution state in the stratum corneum and the periphery of the protoplast membrane. effect. Avoid high temperature, strong light, dry, rainy and other environmental sprays, usually in the morning or evening. When spraying, pay attention to spraying on both sides of the blade, and spray evenly.
In addition, foliar fertilization must master the spray concentration, and the concentration is too large to cause blade damage. Foliar application can also be applied in combination with hormones. At the same time, it should be recognized that foliar fertilization is an auxiliary, not a substitute for root fertilization, and should be used in combination with root fertilization.
Flower leaf surface fertilization
Foliar fertilization is an organic and inorganic aqueous solution that is non-toxic and harmless and contains various nutrients. It is sprayed on the foliage of plants at a certain dose and concentration to provide direct or indirect nutrient supply. A method of fertilization. Practice has proved that the foliar surface can directly absorb the low-concentration, small amount of aqueous fertilizer. Foliar fertilization is a supplement to the nutrients absorbed by plants. It can compensate for the lack of nutrients in the roots, which can quickly improve the nutritional status of plants and benefit plant metabolism.
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