What are the precautions for combined fertilizer application
The solution made by soaking onion skins not only contains a substance that can kill pathogenic microorganisms in the soil, but also contains a variety of trace elements, and can be used as fertilizer for crops. 1. When growing flowers indoors, if the onion skin soaking solution is used as fertilizer, the flower branches grow luxuriantly and the flowers are more brightly colored. 2. Yellowing and withering cucumber seedlings are especially suitable for onion...
When fertilizing, if chemical fertilizer, organic fertilizer or biological bacterial fertilizer is applied alone, none of them can keep vegetables in a good growth state for a long time. This is because each fertilizer has its own shortcomings: chemical fertilizer has concentrated nutrients and takes effect quickly after application, but long-term heavy application will cause problems such as soil compaction and salinization; organic fertilizer has complete nutrients and can promote the formation of soil aggregate structure and build up soil fertility, but its nutrient content is low and release is slow, so it cannot supply enough nutrients in the later stage of vegetable growth; biological bacterial fertilizer can activate nutrient elements fixed in the soil and stimulate root growth and absorption, but it does not contain any nutrient elements, nor can it supply the nutrients needed for vegetable growth for a long time.Having understood the shortcomings of each fertilizer, the following conclusion can be drawn: the combined application of chemical fertilizer, organic fertilizer and biological bacterial fertilizer is better than applying them separately. However, to achieve a relatively good fertilizing effect, the following aspects should be noted during combined application:
First, pay attention to the application time. Organic fertilizer takes effect slowly and should be applied early, generally as a one-time basal application before vegetable sowing or transplanting. Before application, it is best to fully decompose it, as the effect of later topdressing is less obvious than that of using it as a base fertilizer. Chemical fertilizer takes effect quickly; when used as a base fertilizer, apply it about 7 days in advance, and when used as a topdressing, apply it before the critical period of vegetable nutrition or the peak period of nutrient absorption to meet their needs. Biological bacterial fertilizer can only play its role of suppressing bacteria with bacteria after multiplying in large numbers in the soil, so it should be applied early before vegetable transplanting to give it time to multiply and grow. Biological bacterial fertilizer can be applied to the soil together with organic fertilizer, or applied in holes before or during transplanting.
Second, pay attention to the application method. The main role of organic fertilizer is to improve the soil while also providing nutrients. It is generally applied to the soil as a base fertilizer, so it should be applied in combination with deep plowing so that the soil and organic fertilizer are completely mixed to achieve the purpose of improving the soil. Because the nutrients in organic fertilizer are mainly nitrogen, when applying base fertilizer, the nitrogen fertilizer matched with organic fertilizer can be applied in a smaller amount: 30% of the nitrogen fertilizer as base fertilizer and 70% as topdressing. Potassium fertilizer can be applied once as a base fertilizer. Because phosphorus fertilizer has poor mobility and poor topdressing effect later, it should also be applied to the soil as a base fertilizer. The chemical fertilizer used for topdressing is best a fully soluble quick-acting fertilizer, so that after decomposition the fertilizer can be quickly absorbed by vegetables and has less impact on the soil. Because biological bacterial fertilizer is used in small amounts, it can be applied in a concentrated way in the transplanting holes or applied as a base fertilizer together with organic fertilizer. In the later stage, the same biological bacterial fertilizer can be topdressed multiple times to expand the bacterial population, enhance its ability to dissolve phosphorus and potassium, and improve disease prevention effects.
Finally, pay attention to the application amount. Different vegetables at different growth stages require different amounts of fertilizer, and neither too much nor too little should be applied. The absorption of nutrient elements by vegetables follows a certain ratio. For example, the nitrogen, phosphorus and potassium ratio required by tomato is 1:0.23:1.52, that for eggplant is 1:0.23:1.7, that for pepper is 1:0.25:1.31, and that for cucumber is 1:0.3:1.5. Therefore, fertilization should be carried out according to the different fertilizer requirement ratios of vegetables. However, because the soil already contains some nutrient elements, it is best to conduct a soil test and fertilize according to the soil-test formula fertilization recommendations.