Nitrogen application techniques for different growth fruit trees

Nitrogen is the main component of the nutrients required by the apple tree. It is the main component of organic compounds such as proteins, chlorophyll, vitamins, hormones, nucleic acids, enzymes, etc. The profit and loss of apple tree nitrogen nutrition is the basis for fertilizing apple trees. one. However, there is a limit to the amount of nitrogen required by apple trees, and in the annual growth cycle, the time and amount of application of nitrogen fertilizer affect the fertilization effect. If the supply of nitrogen is too much or insufficient, it will not only affect the yield and quality of apples, but also lead to a prosperous or weak tree. Therefore, different growth apple trees have different nitrogen application requirements.
Wang Changshu In the annual growth cycle of apple trees, the long shoots in the canopy are long, and the new shoots of the shoots grow large and grow twice. For such prosperous trees, special attention should be paid to controlling the application of nitrogen fertilizer when the spring shoots are stopped, and less watering.
Debilitating tree When the growth of the tree is slow, the annual growth of the shoots is less than 20 cm, the leaves are erect and rare, the leaves are yellow and crisp, and the shoots of the shoots grow many times, so the growing tree is a manifestation of growth weakness. When applying nitrogen fertilizer to such trees, attention should be paid to each of the fruit trees before and after germination, after flowering and in the autumn.
Steady tree The tree with relatively stable yield, the vegetative branches and short-term branches on the tree grow thick, the proportion of long, medium and short branches is moderate, the growth of various organs is coordinated, the leaves are large and tidy, and the leaves are dark green. When fertilizing such trees, do not apply a single nitrogen fertilizer. It is best to apply a special fertilizer for fruit trees.
In addition, when applying nitrogen fertilizer to fruit trees, there are several points to be noted: First, excessive nitrogen fertilizer should not be applied from May to June to avoid poor coloration during the late growth period; the amount of nitrogen fertilizer should be controlled for some time before harvesting; More phosphorus and potassium fertilizers are applied, and the two fertilizers are better combined. Second, the time for applying nitrogen fertilizer to the fruit trees with relatively high growth should be mainly in the early stage of the annual growth cycle, and the nitrogen fertilizer should be appropriately reduced in the later stage to avoid the occurrence of fruit trees. The third is to apply nitrogen fertilizer before the leaves of the fruit trees, which can rapidly increase the nitrogen nutrition of the leaves in a short period of time, thereby increasing the nutrient storage of the fruit trees.
Henan Rural Newspaper

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