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Unformatted text preview: Micronutrients Roles in Plant Nutrition Various functions in enzyme systems. Note that since micronutrients are immobile in plant, deficiency symptoms appear on younger tissue. Co, Cu, Fe, Mn, Ni, Zn (cations) B, Cl, Mo (anions) These are referred to as micronutrients because their concentration in plants is about 1 / 10 or less than concentration of macronutrients. Deficiency and Toxicity Deficiency , sufficiency and toxicity ranges Iron deficiency in peach. Causes of deficiencies High yields remove substantial amounts High analysis fertilizers contain few micronutrient impurities Better understanding of plant nutrition and improved methods of plant and soil analysis Manganese toxicity in cotton. Sources of Micronutrients Causes of toxicities Inorganic sources Sufficiency range is narrow Wet (reducing) conditions and low pH may increase Fe and Mn to toxic concentrations Incidental applications, like Cu and Zn in sludge or B and Mo in irrigation water Include the structure of primary and secon-...
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This note was uploaded on 01/08/2012 for the course AGRO 2051 taught by Professor Gaston during the Fall '08 term at LSU.
- Fall '08