Dr. Sjoerd Duiker

Professor

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Biography

Sjoerd Willem Duiker is a Professor in the Department of Plant Science at Pennsylvania State University. With a Ph.D. in Soil Science from Ohio State University, his research primarily focuses on soil management practices and their effects on soil physical properties and processes. His work emphasizes the importance of no-tillage practices, soil compaction, and crop rotations in maintaining soil quality. Duiker applies a systems approach to investigate agronomic practices, collaborating with local farmers to enhance soil health and sustainability. His role encompasses both research and extension, with a significant portion dedicated to applied agricultural practices and education. He has published numerous articles in reputable journals, contributing to the understanding of soil management, cover cropping, and the impacts of agricultural practices on soil conservation and nutrient management.

Research Interests

Experience

Professor

2006-01-01 — Present

Pennsylvania State University • University Park, PA

Professor in the Department of Plant Science focusing on soil management and applied soil physics.

Associate Professor

2006-01-01 — Present

Pennsylvania State University • University Park, PA

Conducting research and teaching in the Department of Plant Science.

Assistant Professor

2000-01-01 — 2006-01-01

Pennsylvania State University • University Park, PA

Conducted research and taught in the Department of Crop and Soil Sciences.

Requirements for Pennsylvania State University

Doctorate Program
Requirements
GPA Requirement
Required:3
TOEFL
Writing
Required:24
Speaking
Required:23
Total
Required:100
IELTS
Writing
Required:7
Speaking
Required:7
Overall
Required:7
GRE General
Prerequisites
Master's degree in related field for PhD Baccalaureate degree from accredited institution
Application Checklist
  • Three letters of recommendation
  • Statement of Purpose
  • Writing Sample
  • Official Transcripts
  • Resume/CV
Specialization Notes

GRE scores are highly recommended but not strictly required for Applied Linguistics.