Fruit trees in spring, fattening and avoiding fertilizer

Fruit trees need a lot of nutrients for germination and flowering. Therefore, fertilization in spring is very important. Most fruit farmers are also used to topdressing in spring. However, some farmers found that the young leaves and buds of the tree were atrophied and dried after 1-2 weeks of fertilization. The flowers and young fruits atrophied and fell off, and the strips of the back strips showed watery ulceration. In severe cases, all the big branches died or even the whole tree. Body death. The main reason for this phenomenon is the burning of fertilizer.

At the end of the spring roots dormancy, the root cell vigor is enhanced, the growth rate is accelerated, and the root epidermis is young, which is sensitive to fertilizer at this time. The fertilizer easily forms a high-salt environment in the local area of ​​the roots of the fruit trees, which can damage the root transporting tissues and roots, thereby blocking the supply of nutrients, and the corresponding branches begin to shrink and die.

As the saying goes, "one to one", and the direction of extension of the root is generally consistent with the direction of the corresponding branch. If the big branch has the above problem, the corresponding big root will become brown, black and even rot.

The northern peach trees are most prone to fat damage, followed by apples, oranges, grapefruits, pears, grapes, chestnuts, jujubes and other fruit trees.

To avoid fat damage, the following methods can be used. The first choice is the fertilization method that is chosen correctly. At present, in the actual fertilization of fruit trees, farmers often use acupoints (4 holes in 4 directions around the tree), radiation ditch, annular ditch fertilization or whole garden application. However, the author generally does not recommend the use of acupoints, especially peach, apple, citrus, apricot and plum, but also other shallow roots. Fruit tree fertilization is best applied in combination with decomposed soil and fertilizer. When using annular groove and radiation ditch, pay attention to the too deep or too large a distance; the fertilization of the ditch should not be fertilized in the direction of extension of the big root (can be compared with the direction of the big branch), preferably fertilization between large branches; non-repetitive fertilization ( The fertilization area should be changed every year); the fertilization site should not be too close to the trunk. The second is to choose the right fertilizer. According to the stability of fertilizer and the effect of fertilizer on fruit trees, the probability of occurrence of fertilizer accidents is generally ammonium bicarbonate, ammonium chloride, ammonium sulfate > unfertilized farmyard manure > chlorine-based compound fertilizer > chlorine-based compound fertilizer > sulfur-based complex Mixed fertilizer> sulfur-based compound fertilizer.

If fattening occurs after fertilization, timely remediation is the key to avoiding greater losses, and there is no chance of delaying treatment. The fat damage should be found in time, and the corresponding large roots should be found in the direction of the branches showing the symptoms of the fat damage. If the root part is black rot, it can be scraped off with a knife; if the root rot is serious, the victim part can be cut off, and the main body can be rotted to the main body. The cadres cut off the roots and sun-dried for 1-2 days, paying special attention to avoiding watering.

Author: Wei Rong
Source: Gansu Science and Technology News
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