Why is it important to avoid planting the same crop in the same field year after year

Planting the same crop in the same place each year zaps nutrients from the earth and leaves soil weak and unable to support healthy plant growth. Because soil structure and quality is so poor, farmers are forced to use chemical fertilizers to encourage plant growth and fruit production.

In my own word cell technology can  lead to advances in the understanding of diseases mechanism and transmission because diseases is very bad