4.1 Introduction
4.2 Development of Agriculture
4.2.1 Brief Chronology of Main Achievements
4.3 Chemical Fertilizers and Soil Nutrients
4.4 Crop Protection and Pest Management
4.5 Livestock Production and Protection
4.5.1 Brief History of Livestock Production
4.5.2 Veterinary Medical Care
4.6 New Challenges for Agriculture
4.7 Closing Words
