At present, it is worthy of the spring season for fertilizer cultivation. What should be paid attention to when applying slow release fertilizer?

The first is the choice of fertilizer types . The different controlled release periods mainly correspond to the length of the crop growth period, and the different nutrient contents mainly correspond to the fertilizer requirements of different crops. For example, it is more appropriate to choose a controlled release period of three months for corn, and the nutrient content should be selected according to local conditions.

The second is the period of application . Slow-release fertilizer must be used as a base fertilizer or a previous top dressing, that is, when the crop is planted or during the seedling growth period after sowing. For example, corn can be applied at the time of sowing, or before the six leaves of the seedlings, and it is not suitable for use at night.

The third is the amount applied. The application rate should first consider the nutrient type, content and proportion of coated controlled release fertilizer. For example, a blended fertilizer contains only 30% sulfur-coated urea, and the other 70% is a conventional quick-acting compound fertilizer. If the application can reduce the application rate by 1/3, the application amount of the fertilizer can only reduce 30% of the coated urea. The amount of 1/3 nitrogen is only about 10% lower than conventional fertilizer. At the same time, the application rate of the controlled release fertilizer should be determined based on the target yield of the crop, the fertility level of the soil and the nutrient content of the fertilizer.

The fourth is the method of application. At present, there are problems in the application of slow-release fertilizers in many areas, mainly in the application of mixed fertilizers or seed (root) fertilizers, which cause too much rooting and burning, and the application of slow-release fertilizers in the middle of crop growth. The controlled release fertilizer is applied and applied, so that the slow release fertilizer can not fully exert the fertilizer effect. Application of slow-release fertilizers to isolate fertilizers, ditch (strips) to apply soil, like corn, generally require that the distance between seeds and fertilizers is 8-10 cm, and the depth of application into the soil is about 10 cm.