1, to apply in critical times. Flowering fruit trees require a large amount of boron, because boron can promote pollen germination and pollen tube elongation and prolong the flowering period, so spraying boron during flowering can improve the fruit setting rate.

2, to master a reasonable concentration. In the absence of fertilizer damage, the higher the spray concentration, the better. The concentration of foliar spraying fertilizer in the growing season is generally 0.2-0.5%; the concentration before germination may be slightly higher, such as 2-3% urea, 3-4% zinc sulfate (used for zinc-deficient orchards).

3, choose a reasonable fertilizer. The application of urea in nitrogen fertilizer is the most, and the fertilizer efficiency is better. Potassium dihydrogen phosphate is generally used in phosphorus and potassium fertilizers. Others include sulphate zinc for apple lobular disease, ferrous sulfate (0.3-0.5%) for yellow leaf disease, and calcium chloride (0.5-1%) for bitter pit disease.

4, choose the right time spray fertilizer. During summer fertilizer application, it is best to do it before 10 o'clock in the morning and after 4 o'clock in the afternoon. It is too late or too early, because the rapid evaporation of water will reduce the effect of spraying fertilizer.

5, choose the best spraying site. Trace elements flow slowly in the tree and are best applied to the desired organs.

6, pay attention to the number of spraying. The concentration of foliar dressing is generally low and it takes 2-3 shots to have effect.

7, focus on spraying the back of the blade. There are many stomata on the back of the leaves, loose sponge tissue and large cell gaps, which are conducive to the penetration and absorption of fertilizer solution.

8, rational mix of facilities: the application of fertilizer and some pharmaceutical agents can not only increase efficiency, save time and labor, but also treat other pests, but pay attention to with the use. When compounding agents, no chemical reaction or precipitation can occur.

9, have a suitable amount of spray. The appropriate spraying amount is that the fertilizer solution is in a drip-free state on the blade.

10, to prevent the occurrence of fertilizer damage. Foliage topdressing is best carried out when the leaves grow to a certain size, and the concentration of phytotoxicity produced by different tree species is also different.

(Linmen County, Shandong Province, Shimen Town Forestry Station, Wang Guangxin, Linyi County, Shandong Province, Zhengshan Town Forestry Station, Han Wei Xing Ziping)

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