Soil samples will be collected from

Soil collection process involves:

·  Locate the predetermined sample location

·  Take composite soil samples using an auger from the four sub plots in the plot.

·  Measure soil bulk density down the profile (if using cumulative mass datum) from the center subplot.

·  Collect any associated data required (e.g. slope, topographic position, root depth restriction, etc.).

·  Record all data on prepared data collection forms or suitably programmed data capture devices (e.g. GPS).

 

Labeling of soil samples is critical

Text Box: 1. Place the sample on a large cleaned surface or heavy-duty plastic sheeting. 2. Thoroughly mix the soil sample and spread the sample into a conical pile (Figure 1.a). 3. Further mix the soil by circumventing the cone symmetrically, repeatedly taking a spatula-full of soil from the base and transferring the soil to the apex of the cone. 4. Ensure the spatula is large enough to reach to centre of the cone. Circumvent the cone twice. 5. Flatten the cone to a height of about 1 cm (Figure 1.b). 6. Use a flat spatula or ruler, divide the pile into quarters along two lines intersecting 90° to each other (Figure 1.c). 7. Select one pair of opposite quarters as the sample to be retained (Figure 1.d). 8. If the sample is still too large then repeat the procedure from the beginning. 9. Take a representative (about 750 g) subsample and place it in a plastic bag. Label the bag. Place a label tag inside the bag. Text Box: Avoid

Text Box: Figure !. Composite soil sampling and coning and quartering procedure

Labeling of soil samples is critical