Fertilizer combined with precautions
When fertilizing, if you apply chemical fertilizer or organic fertilizer or biological fertilizer alone, it will not keep the vegetables in good growth for a long time. This is because each fertilizer has its own shortcomings: the concentration of chemical fertilizers is concentrated, and the effect is quick after application. However, long-term large-scale application will cause problems such as soil compaction and salinization; organic fertilizers can promote the formation of soil aggregate structure and fertilize the soil, but the nutrient content is small, the release is slow, and sufficient nutrients cannot be supplied in the late growth stage; Biological fertilizer can activate the fixed nutrients in the soil and stimulate the growth and absorption of roots, but it does not contain any nutrients and can not supply the nutrients needed for vegetable growth for a long time.
Knowing the shortcomings of each fertilizer, it can be concluded that the application of chemical fertilizer, organic fertilizer and biological fertilizer is better than that of single application. However, in order to achieve better fertilization effects, the following aspects should be noted when applying:
First, pay attention to the application time. Organic fertilizers are slow to be effective and should be applied early. Generally, they should be applied once before or before planting. It is best to fully decompose before application. The effect of late application is not as obvious as base fertilizer. Fertilizers are effective, and they are applied about 7 days in advance as base fertilizer. When topdressing is applied, it should be applied in the critical period of vegetable nutrition or before the peak of nutrient absorption to meet its needs. The biological bacterial fertilizer can only exert its antibacterial effect after being propagated in the soil in large quantities, so it should be applied early in the pre-planting of the vegetables to make it proliferate and grow. The biological fertilizer can be applied to the soil along with the organic fertilizer, or it can be applied before or during planting.
Second, pay attention to the method of application. The main function of organic fertilizer is to improve the soil, and at the same time, the nutrient is generally applied as the base fertilizer to the soil, so it is necessary to combine the deep tillage and mix the soil with the organic fertilizer to achieve the purpose of improving the soil. Because the nutrients in the organic fertilizer are mainly nitrogen, when applying the base fertilizer, the nitrogen fertilizer combined with the organic fertilizer can be applied less, 30% of the nitrogen fertilizer is used as the base fertilizer, and 70% is used as the top dressing. Potassium fertilizer can be applied as a base fertilizer at one time. Phosphate fertilizer is poor in mobility, and the effect of late application is not good. It should also be applied to the soil as a base fertilizer. It is best to use the fully soluble quick-acting fertilizer for the fertilizer to be applied, so that the fertilizer can be quickly absorbed by the vegetable after decomposition, and the impact on the soil is small. Due to the small amount of biological bacterial fertilizer, it can be concentrated in the planting hole or applied with organic fertilizer. In the later stage, the same kind of biological bacterial fertilizer can be applied repeatedly to strengthen the microbial flora, enhance its ability to dissolve phosphorus and potassium, and improve the disease prevention effect.
Finally, pay attention to the amount applied. Different vegetables have different growth periods, and the amount of fertilizer required is different. Vegetables have a certain proportion of nutrient absorption. For example, the ratio of nitrogen, phosphorus and potassium required by tomato is 1:0.23:1.52, eggplant is 1:0.23:1.7, pepper is 1:0.25:1.31, cucumber is 1: 0.3:1.5. Therefore, fertilization should be carried out according to the different fertilizer requirements of vegetables. However, because the soil already contains some nutrients, it is best to conduct a soil test and recommend it according to the soil test formula.
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