The Soil Water Debate I Know I Do Not Know.

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Presentation transcript:

The Soil Water Debate I Know I Do Not Know

Soil Pedology 1. What is the accumlative effect of rainfall and irrigation in Mega litres equilavents and the effect upon crops / soil formation Effect of increasing rainfall on a soil sequence in NSW (From Koppi 1990).

Rainfall Characteristics North Ryde Jun 07 – Feb 08 pH uS/m Rainfall (mm) Average 5.5 78.1 12.7 Average Dev 0.6 85.8 8.8 Median 20.0 8.0 Min 3.0 0.0 2.0 Max 7.9 1371.0 51.0 Count 85.0 67.0

Soil Physics

Soil Water Hysteresis Effect on irrigation scheduallinng – ET and TDR also on water movement Conceptual and Parametric Representation of Soil Hydraulic Properties: A Review. Shmuel Assouline * and Dani Or. VZJ Vol. 12 No. 4

Soil Moisture Calculation Moisture Content Camden Boree Desc Measure Soil 1 Soil 2 ( Thea G ) 0.18 0.09 0.07 Bulk Density g cm 1.39 1.3 1.34 1.19

Electrical Conductivity SOIL CHEMISTRY Electrical Conductivity Method Of Measurement – or What are we Measuring ECe EC 1:5 ECw EC app EC1:1 EC 1:2

Soil Chemistry Osmotic potential -0.36* (mmho/cm)   (Osmotic potential) bar Range 3-30mmhos Total Cations or Anions from EC Total Cations or Anions (mEq/l)  10*EC(mmho/cm) Total Dissolved Salts (mg\l)from EC TDS(mg/l) 0.64 *EC(mmho/cm) Formula for EC to Osmotic pressure, Total Cations and TDS. From Bresler, et al 1982

Other Debate POINTS Thank you