Fast-growing seedlings are fertilized

Scientific selection of fertilizers Fast-growing seedlings and topdressing should use quick-acting fertilizers, such as ammonium sulfate, urea, ammonium chloride, potassium chloride, etc., fully smash before application, and strictly control the dosage. You can also choose high-quality organic fertilizers, such as human and animal manure, grass ash, fire ash and straw compost, etc., but be fully decomposed, avoid using raw manure. Organic fertilizers are used as base fertilizers and should be applied to the upper part of the plough layer and fully mixed with the soil. The concentration of human and animal manure should be thin. Nitrogen fertilizer has strong mobility in the soil, and can be applied in shallow shallow ditch, so that it can slowly penetrate into the root distribution layer to facilitate the absorption of seedlings; the mobility of potassium fertilizer is poor, and the mobility of phosphate fertilizer is worse. It is better to apply acupuncture points (holes) to deep The roots are densely distributed.

Soil condition Fast-growing seedlings are topdressed with different fertilizers depending on soil fertility. Such as calcareous or strong acid soil nursery, easy to lack phosphorus, to increase the application of phosphate fertilizer, especially to increase the amount of available phosphorus. Generally, the soil is mainly nitrogenous. If the nitrogen is sufficient, the phosphorus and potassium fertilizer should be increased. The soil texture is different, and the nutritional conditions and fertilizer-preserving ability are also different, so the fertilization methods are different. The soil has good fertility, and each time the amount of topdressing can be more, the number of times is less; the sand-soil nursery with poor fertility can be “less eat more”.

Weather conditions Fast-growing seedlings are based on weather conditions to determine the number of fertilization and fertilization. The temperature is low, the absorption is small, and the application amount should be appropriately reduced; the temperature is high, the root system grows vigorously, the fertilizer is used more, and the dosage should be appropriately increased. It is best to choose the weather in a specific time and when the soil is dry. In rainy days, the roots generally absorb water slowly, not only the nutrients are not easily absorbed, but also the fat is easily washed away by rain, which is not suitable for fertilization.

Growth period The growth of seedlings is divided into four stages: seedling stage, seedling stage, fast-growing stage and hardening stage. In the seedling stage, the seedlings cannot produce nutrients by themselves, and the nutrients stored by the seeds are not fertilized. The seedling stage refers to the emergence of true leaves in the upper part of the seedlings and the lateral roots in the lower part of the seedlings. When the growth of the seedlings is greatly increased, it is sensitive to nitrogen and phosphorus. The appropriate amount of available nitrogen fertilizer and phosphate fertilizer should be applied in time. In the fast-growing seedlings, the aboveground and underground parts of the seedlings grow at the same time, and the demand for nutrients is large. The amount and frequency of nitrogen fertilizer should be increased, and the phosphorus and potassium fertilizers should be applied in proportion. In the later stage, nitrogen fertilizer should be stopped, with potassium as the main and phosphorus as the supplement to promote the lignification of the stems. In the hardening period, it is necessary to prevent the lengthening of the fertilizer and stop the application of fertilizer to improve the resistance of the seedlings. At the same time, for seedlings with strong roots and long distribution, the fertilizer should be applied deep and applied to the periphery of the canopy. The main roots are underdeveloped, and the roots are shallowly distributed with seedlings, and the fertilization should be shallow.

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