Compared with nursery seedlings, container seedlings cannot be applied to basal fertilizer, otherwise it will cause the concentration of certain elements to be too high and cause dead seedlings. In general, only suitable amount of compost is applied, and the effect of topdressing is also good, that is, quick-acting fertilizer is applied in combination with irrigation.
Fertilizer for container nursery is usually formulated with a mixture of N, P, and K nutrients in a ratio of 1:200 and sprayed or rooted through an irrigation system. According to the different requirements of each growth period of seedlings, the N, P, K ratio and application amount are continuously adjusted to achieve the best results.
Seedling growth is generally divided into four stages: seedling stage, seedling stage, fast growth stage, and hardening stage. Seedling period refers to the period when the seedlings have just been excavated. True leaves appear from sowing to the upper part of the seedlings and lateral roots appear in the underground parts. Seedlings in the seedling stage cannot produce nutrients on their own, and their nutrient sources depend on nutrients stored inside the seeds. In the seedling stage, true leaves appear from the upper part of the seedlings, lateral roots emerge from the underground parts, and the amount of high growth of the seedlings is greatly increased. At this time, the seedlings are more sensitive to phosphorus and nitrogen, and the nitrogen fertilizer is generally applied mainly to promote seedling preservation and root growth. The fast-growing period is the period when the seedlings grow most vigorously. It starts with the high growth of the seedlings and the high growth rate. At this time, it is the period with the most growth of shoots and roots of seedlings. The maximum amount of fertilizer and water is needed. The amount and frequency of nitrogen fertilizer application can be increased, and phosphorus and potassium fertilizers can be applied in proportion to promote nitrogen absorption and seedling growth. In the later stage, in order to promote the hardening of seedlings and increase their resistance, nitrogen fertilizer should be stopped in due course. When the seedlings are gradually hardened in the upper and lower parts of the seedlings, they must prevent leggy, stop using fertilizers, and increase seedling resistance.
Irrigation usually takes place in the evening. Irrigation should not be done if the temperature is too high. Application of farmyard fertilizer must be fully skilled, so as not to burn seedlings, but also to kill the bacteria and insect pests in the eggs. The top dressing is usually one or two times a week, and it is better to do it in the early morning. Compared with the root application, the top-dressing fertilizer has less amount and high efficiency, and after 8 hours
Can absorb 60% of leaf fertilizer. For some trace elements, soil application is often ineffective, therefore, the method of extra-root fertilizer application can be adopted, and the two topdressing methods can be combined. Either way, it should be light and heavy. Once excessive fertilization is found, it should be diluted as soon as possible.
Different kinds of seedlings have different requirements for nutrients. To achieve good fertilization effects, it is necessary to determine the best fertilization for different growing seasons and different types of seedlings.
Biological fertilizers have a significant effect on the growth of some seedlings, such as pines. However, when pine seedlings are used for container nursery, mycorrhizal fungi are more difficult to spread and artificial inoculation should be carried out. The soil with mycorrhizal fungi is laid on the soil surface of the container. The general mycorrhizal soil should be taken from around the same type of pine tree roots. The inoculation time should be about one month after the pine seed germinates. If it is put in too early, the lateral roots of the seedlings are not formed, and the mycorrhizal bacteria do not have a host, and they will often fail. However, bean plants such as Acacia, Acacia, Bauhinia, and Wisteria have large amounts of nitrogen-fixing rhizobia, and phosphate fertilizer can largely promote the development of rhizobia. Therefore, such seedlings have higher requirements for phosphate fertilizers and lower requirements for nitrogen fertilizers.
The M-bus Heat Meters(m-bus heat counter) are the higher technology development of the heat meters(heat counters). With the M-BUS function, the M-BUS heat meters can control and read the data from the very far distance and make the labor free. With the M-BUS heat meters appearance, the whole working efficiency is improving rapidly.
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