1. PXRF in Tropical Soils: Methodology, Applications, Achievements and Challenges Sergio Henrique Godinho Silva, Bruno Teixeira Ribeiro, Marcelo Braga Bueno Guerra, Hudson Wallace Pereira de Carvalho, Guilherme Lopes, Geila Santos Carvalho, Luiz Roberto Guimaraes Guilherme, Mauro Resende, Marcelo Mancini, Niton Curi, Rogerio Boguete Alves Rafael, Valeria Cardelli, Stefania Cocco, Giuseppe Corti, Somsubhra Chakraborty, Bin Li and David C. Weindorf 2. Quantitative Estimation of Carbon Dynamics in Terrestrial Ecosystems Using Natural Variations in the Abundance of Soils and Biota Phillip M. Chalk, Fabiano C. Balieiro and Deli Chen 3. The Effect of Elemental Sulfur Fertilization on Plant Yields and Soil Properties Grzegorz Kulczycki 4. Environmentally Friendly Agronomically Superior Alternatives to Chemically Processed Phosphate Fertilizers: Phosphate Rock/Sulfur/Acidithiobacillus spp. combinations S. S. S. Rajan and Martin P. Upsdell 5. Automation in Drip Irrigation for Enhancing Water Use Efficiency in Cereal Systems of South Asia: Status and Prospects Ravneet Kaur Sidhu, Ravinder Kumar, Parshant Singh Rana and M. L. Jat