What factor contributed to the decline of the Neo-Babylonian Empire?

The empire fell into decline after the death of a powerful leader.

the answer is 250 percent.

crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.