Asignificant effect of trade along the silk roads is the spreading of ideas or products from one culture to another. this is referred to as

its probably cultural diffusion

I agree with the person before me: Cultural Diffusion

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.