• Soil science
• Wildlife management
• Plant nutrition

• Soil degradation and rehabilitation in wildlife conservation areas
• Soil compaction and crusting in protected landscapes
• Soil–vegetation–wildlife interactions
• Subtropical horticultural production systems
• Environmental impact management
• Ecological restoration in degraded ecosystems
• Sustainable game drives & off-road driving management

• Prof GP Nortjé - Google Scholar
• Prof GP Nortjé - ResearchGate
• Prof GP Nortjé - ORCID
• Web of Science Researcher ID: AHA-6187-2022

• Vice-President, Soil Science Society of South Africa (SSSSA)
• SACNASP registration as Soil Scientist
• Associate Member of the South African Macadamia Growers’ Association
• Member of the Southern African Wildlife Management Association
• Water Research Commission (WRC) - Steering Committee Member for various industry research project for SUBTROP, and HORTGRO.

• Subtropical Fruit Production:

Investigating soil–plant interactions, productivity, and sustainability in subtropical horticultural systems.

• Soil in Conservation Research:

Evaluating the role of soil properties and processes in conservation success, with a focus on anthropogenic impacts in protected areas.

• Collaborative Projects:
  • With TREES (Tourism Research in Economics, Environs and Society) at North-West University, focusing on tourists’ perceptions on land-use impacts at eco-tourism destinations.

• • With andBeyond Travel, examining the role of sustainable tourism in conserving soil health and ecological integrity in private wildlife reserves.