ven101c_2009_lecture_discussion_soil_chemical_properties3

ven101c_2009_lecture_discussion_soil_chemical_properties3 -...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
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 -plant 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.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 2
SLIDES\VineBalance\UnifSymp98.ppt Montmorillinite What is Cation Exchange Capacity? Vermiculite Vermiculite 1) 100g dry soil, seived to 2 mm 2) NH 4 + acetate to exchange cations 3) Mg 2+ to exchange NH 4 + from sites 4) Measure NH 4 + or Mg 2+ 5) Express as meq charge per 100g CEC = cmol c 100g -1 Cation Exchange Capacity (CEC) Extractable Cations Cations that are important to grapevine mineral
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/29/2010 for the course VEN 101C 91861 taught by Professor Davidsmart during the Spring '09 term at UC Davis.

Page1 / 9

ven101c_2009_lecture_discussion_soil_chemical_properties3 -...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online