Question

how have the cropping practices improved the agriculture yeilds

Answer 1

To increase crop yield, start from the ground up. Testing soils to determine the cause of declining crop yield is the first step toward finding the source of the issue—whether it's disease, a lack of nutrients, or unproductive soil. ... Improved soil ecology, recovery, friability, and fertility.
Yield Improvement. The optimisation of a process to increase yield while reducing cost is a significant challenge. To increase yield, manufacturers are attempting to decrease batch rejection and reduce waste.