Lec11MineralNutritionNotes

86 g l 1 2m kno3 2m cano32 2o 2o 1m nh4no3

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Unformatted text preview: ement can determine the stress of the leaves. Mineral Nutrition Hoaglands Solution (modified) Component Stock Solution mL Stock Solution/1L Macronutrients 202 g /L 2.5 236 g /0.5L 2.5 Iron (Sprint 138 iron chelate) 15 g /L 1.5 2M MgSO4 493 g /L 1 80 g /L 1 2.86 g /L 1 2M KNO3 2M Ca(NO3)2 2O 2O 1M NH4NO3 Micronutrients H3BO3 MnCl2 2O 1.81 g /L 1 ZnSO4 2O 0.22 g /L 1 0.051 g /L 1 0.09 g /L 1 0.12 g /L 1 CuSO4 H3MoO4 2O Na2MoO4 2O or 1M KH2PO4 (pH to 6.0) 136 g /L 1.Make up stock solutions and store in separate bottles with appropriate label. 2.Add each component to 800 mL deionized water then fill to 1 L. 3.After the solution is mixed, it is ready to water plants. Notes: 1) NH4 and NO3 are balanced so that acidification by the plant does not occur in the solution 2) Ca(NO3)2•4H2O is added last 3) Inorganic iron precipitates if solution is alkaline or phosphate salts are present so iron is added with a chelator* 0.5 *chelators hold an ion via ionic forces so that the ion is available to the plant Mineral Nutrition NPK fertilizers N——————————————K Roughly N, P and K relative relative %* *see details at: http://en.wikipedia.org/wiki/NPK_rating Mineral Nutrition Summary Element Uptake Form(s) C, H, O Mode of Transport Mobility Function(s) - passive passive mobile amino acids, protein, nucleic acids, DNA H2PO4- active passive mobile ATP K+ active active very mobile osmotic regulation Ca Ca+2 passive passive very immobile cell wall component, membrane stability Mg Mg+2 active, passive passive mobile center of chlorophyll molecule S SO3-2, SO4-2 passive active, passive somewhat mobile amino acids Fe Fe+2, Fe+3 passive passive very immobile ETS enzymes; chloroplast formation Mn Mn+2, Mn+3 active passive immobile [IAA] regulation Cu Cu+, Cu+2 active passive ETS enzymes Zn Zn+2 active passive IAA synthesis Mo what the important ones - K Know these N NO3-, P Know these - Mode of Uptake MoO4-2 passive passive NO3- - NO2- conversions BO3-3 passive, active passive Cl- active passive you dont need to know B which ones are mobile or not— just know the principle Cl of an element being mobile NH4+ structure immobile Mineral Nutrition control sugar transport in young leaves Essential in PS II - oxygen evolution Nutrient Availability • Soil type they drainage very easily – Sand • Poor nutrient holding capacity – Cation Exchange Capacity (CEC) • Rapid drainage • High [oxygen] supports respiration – Clay • High CEC • Slow drainage • Low [oxygen]? diminishes respiration Cation exchange capacity the organic matter is higher. Mineral Nutrition surface area to volume ratio. smaller particles have a higher surface area to volume ratio so it has more site to hold nutrients. Nutrient Availability most soils are charged adsorbed is binging to a surface • Soil type – Cation Exchange Capacity (CEC) – Relates to soil makeup and SA:V the more SA to V charge a particle= the more CEC it has Cations are positively charged ions the negative ions are absorbed and the positive ion is adsorb...
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