Lawn Fertilizer Conservation Pay attention to nutrient release and fertilization Technical points: Classification and sustained-release principle of special slow-release fertilizers for turf Turf special slow-release fertilizers include 4 types: sparingly soluble synthetic organic nitrides (such as urea-formaldehyde fertilizers), soil organic fertilizers ( Such as nitric acid humic acid), slightly soluble or acid-soluble synthetic inorganic fertilizer, coated fertilizer. Among them, coated-type fertilizers have been widely used because of their sustained-release effect and controlled release time.
In recent years, polyon technology has been used most widely in turf special fertilizers. This technology is mainly through a special coating process, chemically combining an ultra-thin polymer with urea to form particles that can be sustained release.
The nutrient release of polyon is mainly regulated by the osmotic action, and the decomposition of the coating material is related to the soil temperature, without being influenced by the soil moisture and the pH value. Nutrient release includes 3 processes:
(1) Absorb moisture. The first week after application, the polymer film slowly absorbs soil moisture, and when the absorbed water can infiltrate the nutrients, the nutrients begin to dissolve, but do not release.
(2) After the nutrients dissolve, they begin to release slowly and continuously under the action of osmotic pressure.
(3) After the nutrients in the envelope are completely released, the ultra-thin polymer decomposes and is converted into carbon monoxide, ammonium ions, and water under the action of microorganisms without environmental pollution.
Second, the fertilization time Lawn fertilization time is affected by bed type, lawn use purposes, seasonal changes, atmospheric and soil moisture status, the number of grass clippings and other factors. In theory, there are three fertilization periods in spring, summer and autumn. In general, cold-season turf requires higher nutrient levels in early spring and rainy seasons. The most important fertilization time is late summer and late autumn. High-quality lawns are best applied once or twice in the spring. The warm-season turfgrass needs higher fertilizer in summer, and the most important fertilization time is late spring. The second fertilization should be arranged in early summer and midsummer. Fertilization in early spring and late summer is also necessary.
In addition, the timing of fertilization can also be determined based on the appearance characteristics of the lawn, such as leaf color and growth rate. When the turf color fades, it should be fertilized. In the growing season, when the turfgrass is dull, yellowish, and the old leaves are dead, nitrogen fertilizer is needed; when the leaves are red or dark green, phosphorus fertilizer should be added; the turfgrass section is shortened, the veins are yellow, and the old leaves are dead and potassium fertilizer should be added.
Third, fertilization technology points
1. Watering the fertilizer must be done in time, but do not pour too much to prevent the fertilizer from leaching.
2. Inorganic quick-acting soluble fertilizers can be dissolved in water and fertilized with "fertilizer irrigation" method, but the concentration must not exceed 5 ‰, otherwise it will burn the turfgrass.
3. Application of inorganic fertilizer should be a small amount of several times, can improve fertilizer efficiency.
4. It is advisable to use a slowly-releasing fertilizer that releases fertilizer slowly. This fertilizer has a long and uniform effect on turfgrass.
5. The fertilization must be uniform, and each time the amount of fertilizer should be divided into two, to the vertical direction to each other, prevent the local fertilizer and burn the lawn.
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