High capital costs (relative to labor) retard mechanization and lead to selective emphasis on power-intensive operations. Machinery design adjusts to high capital costs by lack of convenience features, simplicity, and reduced durability. Energy is only one of the costs of using machines. Capital and maintenance costs are often larger.
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Major crop nutrient fertilizers (nitrogen, phosphorus and potassium (NPK)) are typically applied in powdered (small particles), granular (larger particles) or in liquid form either as individual or as compound fertilizers.
The fertilizer may be applied using a combine (corn) drill where the seed is contained in one hopper and dry fertilizer in another behind it.