5 commonly used top dressing methods

Crops need to be topdressed after sowing and planting. The amount of topdressing usually accounts for about 1/3 or more of the total amount of fertilizer applied during the whole growing period of the crop. Now introduce several commonly used top dressing methods, enumerate its advantages and disadvantages, for the majority of farmers friends reference.

Direct applicator
  When the crop is watered or after it has rained, it is suitable for the field and the fertiliser can be applied directly to the crop lines. Although this method is relatively simple, part of the fertilizer will volatilize and lose, especially ammonium bicarbonate is very volatile and can not be used; ammonium sulfate, urea and potassium sulfate can be applied, but it is only inconvenient in the field, crops need to Fertilizer and more urgent case selection.

With water pouring
  When the crop is watered, the fertilizer is applied with water to the soil surrounding the roots of the crop. The drawback of this method is that it is more wasteful, easily lost, and does not reach the deep layers of the crop root; the advantage is that it is simple to use, saves time and labor, and labor is not large. It can be used when the source of fertilizer is sufficient, the area for planting is large, and labor conflicts are prominent. When a large area of ​​crops appears severely infertility, it can be used as the top dressing method.

Deep fertilization
  Grows digging pits between plant lines and rows, applies fertilizers, and covers the soil. Using this method, fertilizer is less wasteful and most economical, but it has a large amount of labor and is labor-intensive, and the operation is not very convenient. When applying, pay attention to the buried trenches and pits that are more than 10cm away from the base of the roots and stems of the crops. If the roots are too close to the roots, the roots may be easily damaged. Due to the concentration of fertilizers and their high concentration, this method should not be used in summer when crops grow vigorously and require more water, and it cannot be used during critical periods of crop water demand. Usually in the winter season, when the labor force is sufficient and the crop growth is not large, this method can be used to gradually decompose the fertilizer buried in the soil and continuously supply the crop. However, in actual production, the peak of crop growth is often the peak of demand fertilizer and water, therefore, the buried method is often used when the temperature is high. In order to prevent it from having a negative effect, it is necessary to water after burial, so that the concentration of fertilizers buried in the plant can be reduced.

Facilities
  In recent years, drip irrigation technology has been widely used, and the automation of fertilization has gradually become popular. The specific method of using the drip irrigation facility for top dressing is to install a fertilizing device at the place where the water source enters the drip irrigation pipe, dissolve the fertilizer in the fertilizing device, insert the drip irrigation pipe into the suction pipe filter of the fertilizer, and the fertilizer can automatically enter the crop root with watering. In the surrounding soil. The advantage is that due to the cover of the plastic film, the fertilizer hardly volatilizes, no loss occurs, and the fertilizer is concentrated, but the concentration is small, so it is safe, labor-saving, and effective. This is a top-dressing method that is currently relatively scientific and has great prospects for development. However, due to the large investment, it is difficult to promote it in large-scale production.

Root dressing
  Outside the top dressing is foliar spray fertilizer. In the cultivation of facilities, the artificially created environment is more conducive to meeting the requirements of the crops on environmental conditions, and the crops show the characteristics of rapid growth, high yield, and large results. Spraying is often used in production to make foliar dressings to supplement crop nutrient deficiencies. The method has the advantages of less dosage and quicker fertilizer effect, and can prevent the active ingredients in the fertilizer from being fixed by the soil, and is an economic and effective fertilizer application method.

  In the case of obvious lack of nutrient elements and root senescence in the later stage of crop growth, it can better show its effect. In addition to the large amount of elemental fertilizers commonly used in urea, potassium dihydrogen phosphate, potassium sulfate, potassium nitrate, and compound fertilizers, fertilizers for dressing fertilizers from the roots have been developed by many manufacturers in recent years. Add trace elements or fertilizers containing various amino acids. However, it must be explained that the basic nutrients needed for the growth and development of crops mainly come from basal fertilizers and fertilizers that are applied in other ways. Extra-root fertilizers can only be used as an auxiliary measure.