The field experiments for rotation of grass-crop and belt intercropping have been taken inExperimental Station of Soil and Water Conservation of Heligeer in Inner Mongolia. Three kindsof grasses

i. e.

Vicia sativa L

Melilotus suaveolens Ledeb

Vicia villosa Roth which have grownfor two years

were rotated and intercropped with the local major crops. The results show that therotation of grass-crop and belt intercropping are not only an important way to recover fertility

to rich soil and to increase yield of crops and grass

but also a scientific planting system that con-servates soil and water

and utilizes and protects land because of the remarkable benefits of soiland water conservation.