Final answer:
The most likely explanation for poor crop growth in a field with 60 percent clay soil is the soil's ability to hold nutrients but have slow water movement.
Step-by-step explanation:
The most likely explanation for the poor crop growth in a field with 60 percent clay soil is the soil's ability to hold a tremendous amount of nutrients but have slow water movement. Clay soils have small particles that tightly bind together, resulting in poor drainage and a lack of oxygen availability for plant roots. This can lead to waterlogged conditions, which are not conducive to healthy crop growth.