Exam 2 Definitions | CRSS 3060 - Soils and Hydrology, Quizzes of Agricultural engineering

Download Exam 2 Definitions | CRSS 3060 - Soils and Hydrology and more Quizzes Agricultural engineering in PDF only on Docsity! TERM 1 plant growth factor DEFINITION 1 an environmental factor that impacts or regulates plant growth TERM 2 law of the minumum DEFINITION 2 any plant growth factor can be the limiting factor. TERM 3 soil fertility DEFINITION 3 ability of a soil to supply nutrients to plants over the growing season TERM 4 secondary elements DEFINITION 4 ca, ma, sulfur TERM 5 micronutrients DEFINITION 5 boron, chlorine, and molybdenum TERM 6 cation exchange capacity DEFINITION 6 In soil science, cation-exchange capacity is the maximum quantity of total cations, of any class, that a soil is capable of holding, at a given pH value, available for exchange with the soil solution. expressed in centi-moles per kg. TERM 7 anion exchange capacity DEFINITION 7 measurement of the positive charges in soils affecting the amount of negative charges which a soil can adsorb.AEC generally will increase when pH drops and decrease when pH rises. TERM 8 nitrogen DEFINITION 8 macronutrient needed in highest amt.needed for protein and nucleic acid formationusually the most limiting nutrientsoluble forms: -nitrate - NO3- (isnt strongly adsorbed by most soils because they have little AEC) -ammonium - NH4+ TERM 9 volatilization DEFINITION 9 ammonium in the soil is converted to ammonia gas NH3 at high soil pH TERM 10 denitrification DEFINITION 10 anaerobic bacteria convert nitrate NO3- to N2 gas in saturated soils