Spring fruit topdressing those things
Fertilizer type -
NPK complete
Most people think that spring is the peak period of vegetative growth, which requires more nitrogen fertilizer, so purely topdressing urea is not advisable. Nitrogen is conducive to the growth of foliage, phosphorus is conducive to the development of roots and branches thick, potassium is conducive to the efficient deployment of nutrients. Spring fruit trees require more nitrogen, but they do not need only nitrogen fertilizer. Recommended high-nitrogen water-soluble fertilizers, in which the high nitrogen is to promote the growth of spring shoots, although the content of phosphorus and potassium is lower, but can meet the coordination between the elements, so that fruit trees get a more comprehensive nutrition.
Top dressing time -
March and April best period
The dryland orchard must strictly control the period and application method of fertilization. The time for applying fertilizer should not be too early. It is better to use about 1 week before sprouting, and a small amount of water should be poured in time after fertilization to ensure fertilizer efficiency. In general, fertilization in spring is from early 3 to mid-April.
Fertilizer amount -
Judging from tree-trend
The base fertilizer is insufficient, the tree vigor is weak, and the flower buds are numerous. The amount of top dressing before budding is as large as possible; the bottom is full, the tree vigor is strong, the amount of flowers is moderate, and the top dressing may be less before germination. For individual years of seriousness, this year is the orchard in the first year. It should also be top-dressed and must not be chased. Fertilize in spring, try to avoid the use of furrows and other root-causing soil fertilization.
Top dressing method -
Be thoughtful on the ground
There are two common spring fertilization methods, namely root fertilization and extra-root topdressing (ie foliar spray). For top dressing in spring, nitrogen fertilizer should be the mainstay. According to the results of the fertilization survey in apple orchards, the N, P and K ratios of the compound fertilizers applied were 2:1:2. Generally, 0.4 to 0.7 kg of pure nitrogen, 0.2 to 0.35 kg of phosphorus, and 0.4 to 0.7 kg of potassium were required for producing 100 kg of fruit.
1 root fertilization: fertilization should be applied to the roots in the central distribution area slightly deeper and farther, nitrogen mobility, should be shallow Shi; poor mobility of phosphorus fertilizer, easily fixed in the soil, fertilizer is not easy to spread, but should be relatively Focus on the root distribution layer. Spring fertilization should be shallow, and fertilization should be deep in autumn. Conditional orchards are fertilized after fertilization and cultivated on time. 2 foliar spray fertilizer: foliar spray fertilizer is the main purpose is to add calcium, magnesium and other elements and boron, iron, manganese, zinc and other trace elements. Orchard for lobular disease: Before spring sprouting, spray 0.3-0.5% zinc sulfate + 0.3-0.5% urea mixture for 2 or 3 times to promote leaf development. Fruit orchard, skewed fruit orchard, in the early flowering period and full flowering period, each spraying a boron fertilizer to promote the extension of pollen tube, increase the rate of fruit set, flower protection and fruit preservation. Timely topdressing.
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