Sentence:  The subject of agriculture will in this school be considered under (1) <WSD>agrology</WSD>, or the study of the surface of the earth as to its origin, composition, and physical and chemical properties, ... 
Meaning of the word marked with <WSD> tags:  A subdiscipline of agronomy (the science of utilizing animals, plants, and soils) and of soil science which addresses the influence of edaphic (soil-related) conditions on crop production for optimizing it. (from mid 19th c.)