Seven principles for rational fertilization of nursery seedlings!
It is an important link to cultivate healthy seedlings and fertilize them. During the period of seedling production, we need to carry out fertilization management technology according to the demand of seedling, and introduce the fertilizer management technology in the process of seedling growth as follows......
First, grasp the weather conditions and apply fertilizer. The weather is sunny, dry soil fertilization is conducive to the absorption of seedlings, seedling root to absorb water in rainy days due to slow, not only is not easy to absorb nutrient fertilizer, also easily washed away by rain, resulting in a waste of.
Two. Fertilization according to soil conditions. Sandy soil is poor in fertility and easy to be applied in a small amount of organic fertilizer. The cold manure such as pig and cow manure is good. Clay soil, poor ventilation and low temperature can be increased when applied to fecal manure such as horse and sheep. In addition, the pH of the soil should be adjusted by applying fertilizer according to the acidity and alkalinity of the fertilizer.
Three, according to the characteristics of fertilizer fertilization. Nitrogen fertilizer is more mobile in soil, and it is easy to be absorbed by seedlings by shallow application. The movement of potassium fertilizer is poor, and the mobility of phosphate fertilizer is worse. When used as basal fertilizer fertilizer slow play, should be deep application; fertilizer has fast and shallow application should be.
Four, according to the characteristics of fertilizer seedlings need fertilization. The growth period of seedlings is generally divided into 4 stages: seedling stage, seedling stage, fast growing stage and hardening stage. The nutrient sources of seedlings at seedling stage are mainly nutrients stored in the seeds. Seedling seedlings are sensitive to nitrogen and phosphorus in partial nitrogen mainly, in order to promote seedling and root growth. The fast growing period is the most vigorous period for seedling growth, which requires the most fertilizer and water. The amount and frequency of nitrogen fertilizer can be increased, and phosphorus and potassium fertilizer should be applied proportionally to promote the absorption of nitrogen and the growth of seedlings. The hardening stage of seedling roots and shoots lignification gradually, to prevent excessive growth, stop fertilizer, improve seedling resistance.
Five, choose appropriate fertilizer species. Topdressing fertilizer using quick acting fertilizer or decomposition of human waste. The kinds of quick acting fertilizers used in the fields are urea, Liu acid, iron, ammonium chloride, potassium chloride, Guo calcium phosphate, etc.. The fertilizer must be completely pulverized and not suitable for block use. Cultivate the flower nursery, avoid applying ammonium bicarbonate, because this fertilizer is more volatile, especially under high temperature application, a leaf volatile ammonia burns flower seedlings. If a large number of ammonium bicarbonate, but also to grow seedlings soft, reduce stress resistance.
Six, we should choose the appropriate method of fertilization. The top dressing of seedling can be divided into two kinds: dry method and wet method. Dry spell is the fertilizer furrow furrow depth distribution in root layer, application must be around the roots, not close to the cadres. The seedlings with strong root system and far-reaching distribution are suitable for deep fertilization, and the range should be large. The seedlings with shallow roots should be lightly fertilized, and the range should be small. Application of wet method is the fertilizer on the aqueous liquid fertilizer evenly applied in breeding ground.
Seven, according to the type of seedling, seedling age, seedling density, determine the type and amount of fertilizer. Coniferous trees need more nitrogen and less phosphorus than broad-leaved trees. The general annual seedlings in the early stage of growth for nitrogen and phosphorus is more, in order to promote root growth and development; in the fast-growing period and other elements of a large quantity of nitrogen, phosphorus and potassium; while in the late growth stage with potassium, phosphorus, in order to promote young stem lignification. The density of seedlings is large, the nutrient elements are absorbed more, and the amount of fertilizer should be increased.