Title: Overview of Micronutrients and Focus on Fe and Mn Speaker: Bill Pan. online.wsu.edu
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1 Title: Overview of Micronutrients and Focus on Fe and Mn Speaker: Bill Pan online.wsu.edu
2 Overview of Micronutrients and Focus on Fe and Mn
3 Micronutrients: Essential Elements Required in Small Concentrations (ppm) in Plants Cationic micronutrients: Fe, Mn, Cu, Zn. Other micronutrients: B, Mo, Cl.
4
5 Similarities of Cationic Micronutrients All carry + charges Fe and Mn undergo oxidation/ reduction reactions in soils and plants. All can form chelate complexes with organics. All tend are more soluble under acid conditions.
6 Soil reactions that govern the solubility of cationic micronutrients oxidation-reduction (Fe, Mn only) chelation (all) adsorption (all) precipitation (all)
7 The Cationic Micronutrients Are More Available at Acid phs
8 Iron Nutrition in Plants Principle absorbed form: 2+ ferrous iron (Fe ) Relatively immobile in plants Typical plant tissue concentrations: 100 ppm = mg/kg = %
9 Biochemical Functions of Iron Structural component of porphyrin molecules leghemoglobin (protects nitrogenase from oxygen) cytochromes (energy transfer)
10 Biochemical Functions (cont.) Fe-S proteins ferredoxin (electron transfer in photosynthesis) Enzyme systems nitrogenase (N2 fixation)
11 Iron Deficiency Symptoms Interveinal chlorosis of upper leaves Twig or branch dieback
12 Progression of Fe Deficiency
13 Iron Deficient Orchard in Calcareous soils-jordan
14 Interveinal Chlorosis in Fe- Deficient Wheat
15 Iron Mineralogy Abundance: 4th most abundant element in earth s crust. Primary minerals that contain Fe include biotite
16 Secondary Fe Minerals Pyrite: FeS Siderite: FeCO 3 Hematite: Fe 2 O 3 Goethite: FeOOH most common Fe oxides in soil
17 Fe, Fe Soil Solution Iron ions, various Fe hydroxy species, 2+ such as Fe(OH). various Fe chelates, such as iron citrate.
18 Reduction/oxidation (redox) Reaction acidity Fe(OH) 3 + e- + 3H + = Fe 2 + +H 2 0 waterlogging oxidized reduced (3+) (2+) aerated conditions anaerobic
19 Log Fe in sol n increasing Fe in solution Fe Mineral Stability Diagram FeOOH Fe 2 O 3 amorphous Fe(OH) ph
20 Log Fe 2+ increasing Fe in solution Mineral Stability of Reduced Iron Minerals ph
21 As soil ph decreases, Fe solubility. As reducing conditions increase, Fe solubility.
22 Chelation with soluble organic molecules increases Fe oxides Fe solubility Fe 3+ Fe 2+ ionic concentrations are maintained, and chelated Fe increases organic chelates Fe organic chelates
23 Synthetic Fe Chelate: EDDHA Highly soluble complex (increases, decreases?) solution Fe
24 Metallic Cation (M) Chelation With 2 Citrate Molecules Soluble chelate (increases, decreases?) M availability
25 Humic Acid-Clay-Metallic (M) Micronutrient Complex Insoluble complex (increases, decreases?) M Availability
26 Factors in Fe deficiencies low total Fe content coarse texture low OM low Fe solubility solution Fe decreases by 100 to 1000 x for every increase in one ph unit
27 Fe Fertilizer Sources soil applied ferrous sulfate (FeSO4) has limited success due to rapid oxidation to ferric form in the presence of oxygen. Foliar (FeSO4): mild: one application of 2-3% (FeSO4) at gal/a severe: every 2-3 weeks
28 Fe Fertilizer Strategies (cont.) Injected FeSO4 into tree trunks and limbs Iron chelates as soil or foliar amendments Soil acidification: be able to describe how this will increase Fe availability!
29 Manganese Nutrition in Plants Absorbed form: As with Fe, the most reduced form is absorbed by plants (Mn 2+ ) Typical plant tissue concentrations: 50 ppm Relatively immobile in plants
30 Manganese Functions in Plants Enzyme activator Required in chlorophyll formation
31 Mn Deficiency Symptoms Interveinal chlorosis
32 Mn Deficiency in Wheat: Interveinal White Streaks
33 Mn deficient Nasturtium +Mn Mn Deficiency in Ornamentals Interveinal chlorosis in Gerbera Violet -Mn African
34 Interveinal Chlorosis and Brown Speckling in Mn Deficient Soybean
35 Brown speckling on the underveins of Mn toxic soybean
36 Bark Measles of Mn Toxicity in Apple Trees
37 Secondary Soil Mn Minerals pyrolusite (MnO2) manganite (MnOOH)
38 Soil Mn Total Mn in soils ranges from 20 to 3,000 ppm in soil. Solubility usually controls availability. ph and redox reactions govern solubility.
39 2+ The Mn concentration increases 1000 fold for each ph unit decrease. acidity MnO 2 +2H + =Mn 2+ +½O 2 +H 2 O waterlogging oxidized reduced (4+) (2+) aerated conditions anaerobic
40 Based on these reactions, what management will increase Mn availability to plants??
41 Effect of waterlogging and liming on Mn status of alfalfa Lime Water logging Soil ph Shoot Mn dry wt conc. g/pot mg/kg
42 Manganese deficient wheat from overliming an Atlantic Coastal Plain soil
43 Manganese deficient soybean from overliming an Atlantic Coastal Plain soil
44 Mn Fertilizers MnSO4 soil or foliar MnO MnEDTA Mn fertilizer rates range from 1 to 25 lb Mn/A
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