1. Plant cover crops such as cereal rye to add organic matter and disrupt the life cycle of root knot nematodes.

2. Carbon fixation in every cover crop treatment is higher than that of winter fallow cropland.

3. Pigeon pea: cover crop suited to human and animal nutrition, pest and disease control, N fixation and P disponibility.

4. In 1962, Stylosanthes was firstly introduced to Hainan of China as a cover crop in rubber tree plantation from Malaysia.

5. Table 1. The plant height, plant density and fresh yield of the cover crop.

6. If possible, in the year before you plant potatoes, plant a cover crop to improve the soil and the potato production.