ven101c_2009_lecture_discussion_soil_chemical_properties3

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SLIDES\VineBalance\UnifSymp98.ppt David R. Smart [email protected] 2142 RMI North Monday 9:30-11:30 754-7143/754-7144 VEN 101C 2009 1) Economic considerations 2) Regulatory considerations 3) Climatic considerations 4) Soils considerations soil survey soil physical properties soil chemical properties Site Evaluation: Soil Evaluation: Chemical Properties pH, -log[H+] Extractable Ca, Mg, K, Na Ca:Mg Ratio and base saturation Salinity and sodicity Heavy metal content Aluminium concentration Soil Evaluation: Chemical Properties Lime and lime requirement Gypsum and gypsum applications Electrical Conductivity (ECe) Exchangeable Sodium Percentage Leaching and leaching requirement Objectives of Chemical Analysis Objectives of Chemical Analysis Identify chemical hazards that will impact or preclude the production of grapes. Assess overall soil fertility status. Identify soil properties that will require pre Identify soil properties that will require pre- plant remediation. Identify soil properties that will require on Identify soil properties that will require on- going going management to avoid problems. Facilitate selection of ripping depth, rootstocks, Facilitate selection of ripping depth, rootstocks, vine spacing and trellis design.
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SLIDES\VineBalance\UnifSymp98.ppt Need ShakeRidge Chem Analysis here The concentration of a nutrient element in soil is often given as parts per million, weight per mass, solution concentration. Mass : 1 ppm = 1 g g soil -1 1 g g -1 = 1 mg kg soil –1 mg kg soil –1 x BD = kg m -3 = g cm soil -3 (x depth) Molar equivalents : meq 100 g soil -1 eq = mole weight cmol c 100 g -1 meq charge 1000 g -1 meq L -1 (SP extracts) 1 cm 3 H 2 O 1 g
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