Figure 1.--These soybean plants ofa single variety were grown experi- 
mentally in several calcareous soils--kinds of soils in which many 
plants become chlorotic due to failure to take up adequate ironin use- 
ful form. The plants at left, not treated, produced yellowed, chlorotic 
leaves. The plants at right, given chelate treatment, developed nor- 
mally green foliage. 
Since then, research to determine specific uses and limitations of 
chelates and chelated metals among various agricultural crops has ex- 
panded rapidly. 
Chelated metals are expensive and their prospect for becoming less 
costly are unpredictable. Consequently, they are practical, at present, 
primarily for treating crop trees, ornamentals, and other high value 
plants. However, it is possible that some chelated metal treatments may 
be developed that can be used economically in row-crop farming. 
PLANT DEFICIENCIES THAT CHELATES COMBAT 
The Leading Symptom--Chlorosis 
Metal nutrient deficiencies in plants that chelates combat are evi- 
denced by chlorosis as the leading symptom. 
Chlorosis--a Greek word " chloros, '' meaning green, merged 
with a suffix "osis,'' indicating disease--describes a yellow- 
ing and fading of foliage and is a warning that the plant is de- 
Bi Saee 
