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Mastering the time of spraying is in the shed period. Because the humidity in the shed is large, the leaf surface is easy to accumulate water droplets. When the fertilizer is sprayed, it must be carried out after the water droplets are evaporated. General spray fertilizer is between 10 am and 4 pm. During the non-detention period, the general spray fertilizer is carried out from 8 am to 6 pm. However, in the case of excessive temperature, avoid 10 am to 4 pm.
During the spraying period, foliar spray fertilizer is generally applied in the pre-flowering stage, the flowering stage, the young fruit stage, and the leaf surface deficiency stage. The spraying interval should be about 10 days. Generally, the micro-fertilizer is sprayed during the flowering period, and the fertilizer is sprayed during the fruit period.
Suitable spray fertilizer humidity is suitable for spray air, the relative humidity of the air is generally 50% to 80%.
When the growth of the fruit trees is slow, when the tree body is weak, the leaves are yellow and the growth is slow, the plants are deficient in nitrogen. At this time, it should be based on nitrogen fertilizer, combined with spraying phosphorus and potassium fertilizer. When the tree grows strong, the leaves are green and the internodes are too long, the nitrogen is too rich. At this time, the fertilizer should be mainly phosphorus and potassium.
There are many leaf holes on the back of the spray part, and the fertilizer is easy to seep into it. The spray fertilizer should be mainly on the back of the leaf, preferably both front and back.
From: China Flower News
The concentration of spray fertilizer is generally 0.3% to 0.4%, potassium dihydrogen phosphate is 0.2% to 0.5%, potassium sulfate is 0.5%, superphosphate is 0.5% to 1%, borax is 0.1% to 0.2%, and zinc sulfate is 0.1% to 0.2%, manganese sulfate is 0.05% to 0.1%, and agricultural rare earth is 0.1%.
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