How would a canal help farmers grow more wheat?

If in the Pacific Northwest of Oregon and Washington farmers rotate the crops of peas and wheat in the Midwestern states and the Canadian provinces farmers rotate soybeans and maize while in china peasant farmers grow cowpeas followed by rice .relate thes?

• Answer:

  Legume crops, like the peas, soybeans, and cowpeas, help replenish the soil, so farmers often rotate legume crops with non-legume crops. They rotate between the legumes and wheat, maize, and rice that help with the nitrogen cycle of the soil. They use less fertilizers that way.