In addition to applying basal fertilisers, it is necessary to properly coordinate the nutrient elements in various stages of growth. Fertilizers should be applied in time in order to grow well and produce flowering results. Second, pay attention to the amount of fertilizer: Large flowers or potted plants that grow more vigorously have slightly higher fertilizer concentrations; in normal growth, the concentration should be lower; in severely growing ones, fertilization should also be stopped. You can also refer to changes in leaf color to determine whether fertilization is needed. If the leaves are bright green or the leaves are sagging, there is no shortage of nutrition and no fertilization is required. Third, pay attention to the composition of fertilizer: When applying chemical fertilizers, it is necessary to clarify the nitrogen, phosphorus and potassium contents of fertilizers. According to the different stages of flower growth, the application of fertilizers and the amount of chemical fertilizers should be based on the principle of “rather light and not strongâ€, and in accordance with the various flowers The growth habits, fertilizer absorption capacity, plant size, and growth status are different. The application must not be quantified mechanically by basin size. Fourth, rescue measures to cause damage: If it is found early, it can be soaked in water to “enemaâ€, or dump the flower mud from the basin to remove the old soil and replant. If it is found late, it is difficult to recover. Fifth, other matters needing attention: 1. Since the root groups of trees are widely distributed, the nutrients and moisture are absorbed in the fibrous roots. Therefore, fertilization should be done around the roots and not near the trunk. 8. The basal fertilizer should be applied deeper because of its slower development of the fertilizer effect, and the top dressing fertilizer effect is faster. 9. Foliar spraying fertilizer enters the leaves through the stomata and stratum corneum, and then is transported to various organs. Generally, the young leaves are older than the old leaves, and the leaves do not absorb water faster than the leaves, and the absorption rate is also high. Therefore, the actual spray must be sprayed evenly on the back of the leaf, so that it is beneficial to the absorption of the trunk. To strictly control the concentration, so as not to burn the leaves, it is best to spray on cloudy days or before 10 o'clock in the morning and after 4 o'clock in the afternoon so as to avoid high temperatures, rapid solution concentration, affecting spray fertilizer or causing phytotoxicity.
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2. For trees with strong roots and deep distribution, fertilization should be deep, and the range should be large; then the trees with shallow roots should be fertilized lighter and the range should be smaller.
3. The organic fertilizer should be sufficiently fermented, decomposed, should not use raw manure, and the concentration should be diluted, the chemical fertilizer must be completely crushed into powder, not suitable for block application.
4. After fertilization (especially chasing chemical fertilizers), water must be fed in a timely manner so that the fertilizer can seep into the soil.
5. Fertilizer should be selected when the weather is clear and the soil is dry. Rainy days, due to the slow absorption of water by roots, not only can the nutrients be easily absorbed, but the fertilizer can also be washed away by rain, causing waste.
6. Sand, sloping land and rocks are prone to loss of nutrients and fertilization should be deeper.
7. Nitrogen fertilizer has a strong mobility in the soil, so shallow application penetrates into the root distribution layer and is absorbed by the trees. Potassium fertilizer has poor mobility and the mobility of phosphate fertilizer is worse, and it should be applied deepest to the root system.