The couple's innovation was praised by the Northland Ballance Farm Environment judges.
Steeper areas on their property have been retired from grazing and planted with a range of production forestry species, and extensive riparian and wetland areas have been re-established in the valley systems.
Judges also commented on the careful attention to detail shown towards grazing, financial and nutrient management.
The Alexanders will give an overview of the business and a tour of the property.
The field day programme alsoincludes the innovative use of clover silage for supplement, pest control and bush management, minimising water use and the integration of beef and forestry in their farming operation.
The Alexanders also captured the Ballance Agri-Nutrients Soil Management Award, LIC Dairy Farm Award, Massey University Innovation Award, and the WaterForce Integrated Management Award.
Other 2015 Northland winners were:
Beef+Lamb New Zealand Livestock Award
Laurie Copland and Copland Family Trust, Broadwood, Kaitaia.
Hill Laboratories Harvest Award
Angela and Tony Payton, Whispering Pines, Kaitaia.
Northland Regional Council Water Quality Enhancement Award
PGG Wrightson Land and Life Award, Donaghys Farm Stewardship Award
Sandy and Ian Page, Tahere Farm, Pataua North, Whangarei.