The yellow shoots of the new shoots growing late in the late period appear to be iron-deficient. The main reason is that the soil is highly alkaline, and iron in the soil cannot be absorbed by the roots.
Control methods:
1, spray iron fertilizer. Iron fertilizer is mainly ferrous sulfate. Before spraying, the concentration is about 1%. Spraying at the growth stage, the concentration is 0.30%-0.50%, and when the symptoms are serious, it can be sprayed several times.
2, buried bottle method. Early spring bottle best effect. When the tree has just sprouted, the ferrous sulfate solution with a concentration of 0.10%-0.30% is put in a washed bottle for use. Roots were excavated at 1 meter from the trunk, roots with a diameter of 5 mm were selected, and the roots were cut and inserted into a bottle containing a ferrous sulfate solution, which was then buried well with soil. Buried 4-6 bottles can be.
3, increase organic fertilizer. The humic colloids produced during the decomposition of organic matter can activate and adsorb available iron ions in the soil for absorption and utilization by the tree body.
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