Week 7 Ag Lab by ULStudent:CAOIMHE.PIERCE

Hypothesis

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Different soil samples will feel different and have different plasticity

Prediction

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If theres a lot of clay in the soil sample it will be smoother and easier to mould

Scientific Practices

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(SP: 1.1) Collect, organise, interpret, present and analyse primary and secondary data with and without the use of technology.
(SP: 1.1) Appreciate the difference between accuracy and precision conduct an open-ended investigation.

Variables

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Independent Variable: Soil type
Dependent Variable: plasticity of soil

Control

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Weight of the soil sample
Volume of water used

Hypothesis

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Certified seeds will have a greater uniformity than uncertified seeds.

Prediction

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If the certified seeds have a greater germination rate and smaller range in height than the uncertified seed then they will be more uniform.

Dependent variable

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The amount of seeds that germinate in the certified and uncertified seed and how big the ranges are in the stem heights

Control

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Amount of each seed that is sown.

Independent variable

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We choose the certified and uncertified seed type in the investigation to be barley seeds

Procedure

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Scientific Practices

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(SP: 1.2) Design, manage and conduct a practical investigation.
(SP: 1.1) Make a prediction based on a hypothosis.

Step 1 & 2

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Dry the soil out in an oven. When soil is dry, crush it with a pestle and mortar.

Step 3

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Once crushed, Weigh an empty weighing boat; place the crushed sample into the boat and reweigh. Subtract the mass of the empty weigh boat to calculate mass of soil.

Step 4

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4. Place crushed soil sample in the largest soil sieve. Place cover on sieve and shake.

Step 5

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Take the lid off the sieve and separate each compartment

Step 6,7 & 8

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6. Weigh the empty weighing boats.

7. Pour the contents of each sieve into separate pre-weighed boats.

8. Weigh each sample in turn.

Step 9 &10

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9. Calculate each separate sample of sand, silt and clay as a percentage of the total soil mass.

10. Use the soil triangle to help classify your soil sample

Questions

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Step 1

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Count 50 certified seeds and 50 uncertified seeds.

Step 2

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Place (barley) seeds in separate labelled beakers with water and leave them to soak for 24 hours.

Step 3

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Plant 50 seeds from each sample in a tray. Separate the tray down the middle and plant 50 certified seeds one side and 50 uncertified seeds in the other side.

Step 4 and 5

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4. Both sets of seeds should be provided with the same amount of light, nutrients and water. Monitor the seeds until both sets have reached establishment.

5. Examine both sets of seeds. Identify how many certified seeds have the characteristics that define its uniformity and repeat for uncertified seeds

Students

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Caoimhe Pierce 20248784
Diane Foley 20259182
Lauren Campion 20235526

Step 1:

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Collect a sample of soil.

Step 2&3

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2. Place 50cm3 of the soil into a beaker and add water. Pour all of the contents into the graduated cylinder.
3. Stopper the cylinder and shake well.

Step 4

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4. Allow the soil to settle (sediment) .

Step 5

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5. Examine and measure the volume of sand, silt, clay and humus. Calculate the % of each in the soil sample.

Procedure: To determine the soil texture of a soil sample using a sieve

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Significance of Soil Managment

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Influences water holding capacity
Water infiltration
Nutrient retention

Hypothesis

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Different soil samples will have different quantities of sand silt and clay

Prediction

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If it is a clay soil it will have a high % of small particles <0.002mm.

If you have a loam soil then you will have equal quantities of sand silt and clay

Variables

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Independent variable: Soil Sample
Dependent Variable: % Sand, silt clay

Hypothesis

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Sand, silt and clay will have different densities and should separate out of a soil sample when water is added and the sample is shaken.

Prediction

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If water is added to a dry sieved soil sample then the sand ( densest particle ) will fall to the bottom followed my silt and clay will remain at the top

Variables

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Independent Variable: soil sample
Dependent variable: % sand, silt and clay

Results

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Calculations:
sand 3.82/34.93 = 10.9 %
silt 3.42/34.93 = 9.8%
clay 26.11/34.93 = 74.7%

95% of inital sample is accounted for.
Other 5% lost through errors e.g
1. Hard to remove full sample out of the sieve each time
2. clay is so light if flies away easily

Scientific Practices

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(SP: 1.1) Appreciate the difference between accuracy and precision conduct an open-ended investigation.

Learning Intentions

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1. Understand and be able to distinguish the differences between certified and uncertified seeds.
2. Be able to list the properties of certified seeds.
3. To be able to correctly sow barleys seeds in a seed bed.

Learning Intentions

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1. Establish the different properties of soil based on their texture.
2.Investigate the weight of each component of soil( sand silt and clay)

Unpacking Outcomes

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Learning Intentions:

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1. Establish the different properties of soil based on texture
2. Identify the name of each soil
3. Understand the soil triangle

Learning Intentions:

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S (2.2.2) Investigate the texture of soil by using a soil sieve

Scientific Practices

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Scientific Practices

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SP (1.2) Design , manage and conduct a practical investigation

Step 1

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Take a dry sample of soil and rub it between thumb and fingers. Take note of grittiness or smoothness.

Step 2

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Wet the sample with water and rub it between thumb and finger again noting grittiness or smoothness, also checking it's plasticity. Check if the wet sample is sticky or not. Use a flow chart to identify the soil.

Step 3:

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Try to roll the sample into threads on a flat surface, record if this is possible. Record any observations.
Compare all results using he flow chart

The Three soils used in this experiment were:

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A.

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B. Clay Loam

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C. Chalk soil

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