Bui. 1484, U. S. Dept. of Agriculture 
Plate 3 
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Comparison of Cotton Root Systems from Different Soils W'Th 
Regard to Crazy-Top Disorder 
The root system in the upper left-hand corner shows the typical rooting habit of Pima cot- 
ton in porous river-bottom soil (Pima sand at the United States Field Station, Sacaton, 
Ariz.), where the crazy-top disorder has never been in evidence. The seven other root 
systems are typical of Pima cotton plants in mesa sandy loam (McClellan sandy loam at 
the Sacaton seed farm), which has cementing tendencies and where the crazy-top disorder 
has been prevalent for at least four years. The farms are about 1 mile apart 
