There is a relationship between fertilizers and a contradiction between fertilizers. If more phosphate fertilizer is applied, the excess available phosphorus will combine with the available zinc in the soil to form insoluble zinc phosphate precipitation, which will cause the lack of available zinc in the soil. Not only that, the excess available phosphorus can also inhibit the absorption of nitrogen by crops, causing nitrogen deficiency. Another example is to apply more potassium fertilizers. The excess potassium will reduce the absorption of nitrogen, magnesium, calcium, boron and zinc by the crops, causing the crops to lack these nutrients. In addition, even organic fertilizers should not be used too much.
To prevent "compromising" between fertilizers, the following methods can be adopted:
1. As far as possible to achieve balanced fertilization. Partial application or more application of elemental fertilizers to crops will not only cause waste and increase production costs, but also easily lead to the lack of some other nutrient elements. When fertilizing, it is necessary to meet the requirements of the amount of income according to the different fertilizer structure of crops and the fertilizer supply capacity of the soil.
2. According to the crop's demand for the most nutrient elements, the ratio should increase with the increase, or decrease with the decrease. Compared with simple fertilizers, the ratio of nutrient elements in compound fertilizers or compound fertilizers is more appropriate and coordinated. Therefore, compound fertilizers should be used as the main fertilizer when fertilizing, and elemental fertilizers should be used as supplements. For example, for crops that require a large amount of potassium such as tubers and roots as harvest objects, the application of sulfur-based compound fertilizers can be appropriately increased. Potassium sulfate elemental fertilizer is used as a supplement.
3. Stagger the application period or application site. If zinc fertilizer and phosphate fertilizer are mixed, it will inevitably produce "combination". Therefore, phosphate fertilizer should be used as base fertilizer or base fertilizer, and zinc fertilizer should be used as topdressing. Nitrogen, phosphorus, potassium and other macro-element fertilizers should be mainly rhizosphere topdressing, and micro-fertilizers should be sprayed on leaves.
4. Reduce the scope of contact. Nitrogen and potassium fertilizers can be applied by spreading methods; phosphate fertilizers can be concentrated fertilization; micro-fertilizers can be seed dressing, seed soaking, root dipping and other methods, so that the trace elements are confined to the smaller range of the roots, and try not to use a large amount of Element contact.
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