What Is The Possibility For Manufactured Land To Be Used For Agricultural Purposes?

Yes - provided the soil material is sufficiently fertile, free from rocks and/or contaminants (polutants) and well drained. Large areas of the Netherlands are essentially "manufactured" land; essentially drained lakes and marshes that are below sea level. These support a combination of farming land, farm buildings and urban areas. You might arge that parts of England (Cambridgeshire, adjacent to the Wash) are similar.