人教版高一英语下21

[06:16.01]plough deeply the first time and less deeply the second time.
[06:21.78]So the autumn ploughing should be deeper than the spring ploughing.
[06:27.13]4.Change the crops in your fields.
[06:32.59]Do not plant,for example,rice year after year in the same field.
[06:38.84]But if you plant rice in a field one year and wheat in the field the next year,
[06:45.50]you will harvest good crops.
[06:49.47]5.Grow different plants next to each other in the same field.