Spring is the season when fruit trees sprout and bloom. At this time, fruit trees need a lot of nutrients. Therefore, fertilization in the spring is critical, and most fruit growers are also accustomed to top-dressing in the spring. However, after 1 to 2 weeks of fertilization, some fruit growers found that large branches or entire trees had young leaves and buds that shrivelled and dried up, flowers and young fruit shrank, and the strip bark on the back showed watery ulceration. In severe cases, all the large branches died or even the entire tree. The body died and caused serious damage. The main reason for this phenomenon is the burning of fertilizer. The occurrence of root-burning of fertilizers is basically consistent with the law of the distribution of the root system in the fruit tree species. Peach in the north is the most prone to damage, followed by apple, orange, grapefruit, pear, grape, chestnut, jujube and other fruit trees.

To avoid fertilizer damage, the following methods can be used. First of all, it is necessary to correctly choose the fertilization method. At present, in fruit trees, the actual application of fertilizer in the fruit and vegetable farmers often use point methods (digging 4 points in 4 directions around the tree), radial grooves, annular groove fertilization method or whole garden spreading fertilization method. However, I generally do not recommend the use of cave methods, especially peach, apple, citrus, apricot and plum, but also other shallow roots fruit trees. Fertilization of fruit trees is best combined with the use of composted soil and fertilizer. When using ring groove and radiation groove fertilization, pay attention to not apply too deep or too close to large roots; do not apply fertilization in the extension direction of large roots (in the direction of large branches), and it is best to fertilize between big branches; do not repeat fertilization ( The fertilization area should change every year; the fertilization area must not be too close to the trunk. The second is the correct choice of fertilizer. According to the stability of fertilizers and the effect of fertilizers on fruit trees, the probability of occurrence of fertilizer accidents is generally ammonium bicarbonate, ammonium chloride, and ammonium sulfate> unfamed farmyard manure> chlorine-based compound fertilizer> chlorine-based compound fertilizer> sulfur-based compound fertilizer Mixed fertilizer> Sulfur-based compound fertilizer.

If there is fertilizer damage after fertilization, timely remedy is the key to avoiding greater losses, and you cannot hold on for a chance to delay treatment. The fertilizer damage should be discovered in time, and the corresponding large roots should be looked for in the extension direction of the branches showing the symptoms of fertilizer damage. If the root part is found to be black and rotten, it can be scraped off with a cutter; if the roots are rotted badly, the affected part can be cut off, and the rotting can be taken from the main part. The cadres cut off the roots and dried them for 1 to 2 days to avoid flooding.

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