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Chlorosis means a lack of chlorophyll
Time:2016-12-30 12:08:48 Browse:640
Chlorosis means a lack of chlorophyll — the green stuff manufactured in the plant when enough nitrogen, magnesium and iron (plus sunshine and warmth) are present for the plant to process and manufacture what it needs to produce chlorophyll. Plants that show signs of iron chlorosis tend to have yellowing leaves, but the veins of the leaves remain green. It usually affects the newest leaves and can cause plant tissue to die. The leaves turn brown and look like they have been scorched by a fire.
Alkaline soils can be unusually high in iron (look at Red Rocks Amphitheater) but the iron is unusable to plants. In soils above a pH of 7.0, iron is rapidly fixed through a chemical reaction into insoluble forms that cannot be absorbed by plant roots.
Iron will be tied up indefinitely unless pH can be changed. If you have free lime in your soil, changing the pH is difficult, if not impossible, since the soil is highly buffered. Any acid added will be neutralized by the lime. A soil test can confirm what you see visually and give recommendations on what (if any) additives to put in the soil.
So what can you do for your chlorotic trees? Iron treatments include foliar spraying, iron injections or soil applications. Many arborists recommend trying soil applications first, as they can last up to two years and do not injure the tree. Buy an iron chelate that contains EDDHA or EDTA on the label. These products work best in alkaline soils. Products that contain EDTA have limited success and work better in acidic soils. Follow the instructions on the label and apply properly. Another thing to consider is to plant trees and shrubs that do well in our alkaline soils.
 
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