,分类,种类)??有益元素??每个必需营养元素的吸收(代谢与同化)、体内含量、分配、营养功能、缺乏(或中毒)症状(诊断)?Р每个必需营养元素所对应的肥料(种类、性质和施用技术等)??N,P,K 肥料三要素? 微肥?单质肥料与复合肥料?有机与无机肥?含Cl-肥料与含SO4 2- 肥料??施肥与环境? 配方施肥?Р尤•李比西? (1803---1873)РLiebig (1840) “Organic chemistry in its application to agriculture and physiology ”РA: Mineral Element Theory? (矿质营养学说)РB: Nutrient Return Theory ?(归还学说)РC: Minimum Nutrient Law?(最小养分律)РMacroelement C, H, O,N, P, K, Ca, Mg, S?Microelement Fe, Mn, Cu, Zn, B, Mo, ClРBeneficial element Na, Si, I, V, Co, NiРCO2РUptake and distribution of boron ?at flowering stage (µg)? B-ineffi. B-effi.? -B +B -B +B?Oldest leaf 11.02 17.27 7.70 13.70?Youngest leaf 0.024 0.15 0.245 0.586 ?Main stem 10.55 28.72 23.73 26.68?Flower 1.23 5.67 3.46 7.85?Bud 1.84 11.48 1.96 7.00 ?Total 32.85 89.37 45.63 78.21РEnzymologyРIsotope trace technique
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