How to apply iron fertilizer to prevent yellow leaf disease

Iron deficiency is most common on calcareous soils. The main symptom of iron deficiency in crops is chlorosis, which is yellow leaf disease. The current application of iron fertilizer is mainly ferrous sulfate, application methods include basic application, spraying, trunk injection and so on. Because iron is easily fixed in soil and has poor mobility in plants, it can be mixed with iron fertilizer and organic fertilizer at the time of basic application. It must be applied before sowing or before transplanting. When iron deficiency symptoms occur in plants, spray 0.1%- A 1% concentration of ferrous sulfate is sprayed several times, which is generally more effective than soil application. For woody plants, solid or liquid ferrous sulfate can also be used to insert or flow into the trunk. As ferrous sulfate is easily oxidized into ferric sulfate, it is difficult to be absorbed by crops and the effect is not ideal. In recent years, chelated iron fertilizers have also been gradually used. Fertilizers such as iron fulvic acid, Fe-EDDHA, Fe-EDTA, and Fe-DTPA have good effects regardless of soil application or foliar spray. The residual effect of iron in the soil is not obvious and it needs to be applied year after year.

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