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This book presents in nearly 180 questions a number of key concepts in general agronomy. Through four chapters dealing with the functioning of the cultivated plant, the management of light, water and fertility, concepts such as yield, growth and development, density and rooting are defined as well as light energy, potential production, transpiration, evapotranspiration, humidity at field capacity, water circulation in the soil, etc... Methods such as germination capacity calculation, yield component analysis, humic balance are also explained. An important place is given to fertility and fertilization issues. In addition to defining the notions of deficiency, manure, compost and mineral fertilizers, it develops the methods of crop profile, soil analysis and humic and mineral balances that allow for a judgment on soil fertility. It provides information on the principles of mineral fertilization such as the notion of limiting factor and the interactions between elements or factors.Translated with www.DeepL.com/Translator (free version)