Soil sampling for chemical analysis
Summary
TLDRThis instructional video demonstrates the proper technique for collecting soil samples for nutrient analysis. It covers the use of a soil auger, sample bags, and tags to obtain samples at 10 and 20 centimeters depth. The script emphasizes the importance of sampling at right angles to the land's slope, removing soil from the auger, and ensuring sample integrity. It also explains how to handle potential compaction and the process of creating a composite sample from multiple soil samples, highlighting the need for accuracy and careful handling throughout the sampling process.
Takeaways
- 🧪 Conduct a soil chemistry test to understand nutrient supply.
- 🛠 Use a soil corer for collecting samples, along with a table knife, cloth, sample tags, and bags.
- 📏 Ensure the soil corer is placed at right angles to the land's slope, straight up and down if the land is flat.
- 🔍 Collect a sample down to 10 centimeters for initial chemistry analysis.
- 🕳️ Remove soil from the outside of the core and clean the core if necessary.
- 🔄 If sampling down to 20 centimeters, use the same hole and push the corer down to the marked depth.
- 💪 Use a rubber mat to assist in pushing the corer if the soil is hard.
- 🗑️ Discard samples that are uncertain or contaminated and collect new ones.
- 📦 Secure the sample in a bag and label it with the appropriate depth range.
- 🔬 Collect multiple soil samples to create a composite sample for accurate analysis.
- 📝 After collection, secure the bag, place the tag inside and outside the bag for proper identification.
Q & A
What is the purpose of conducting a soil chemistry test?
-The purpose of conducting a soil chemistry test is to understand the nutrient supply of a site, which helps in assessing soil fertility and determining the necessary amendments for optimal plant growth.
What tools are required for collecting a soil sample for chemistry analysis?
-The tools required for collecting a soil sample include a soil auger, a club hammer, a table knife, cloth sample tags, bags, and a plastic tray.
How should the soil auger be positioned when collecting a sample on flat land?
-When collecting a soil sample on flat land, the soil auger should be positioned straight up and down, perpendicular to the mineral soil surface.
What is the correct way to position the soil auger if the land is sloping?
-If the land is sloping, the soil auger should be placed at right angles to the slope of the land to ensure a proper sample is collected.
How deep should the soil auger be pushed into the ground for a standard soil sample?
-The soil auger should be pushed down to a depth of 10 centimeters for a standard soil sample.
What should be done if the soil is hard to remove from the auger?
-If the soil is hard to remove from the auger, a cloth can be used to gently clean off the soil from the outside of the auger.
Can the same hole be used to collect samples at different depths?
-Yes, the same hole can be used to collect samples at different depths, such as 0 to 10 centimeters and then 10 to 20 centimeters, by carefully reinserting the auger.
What should be done if the soil sample is contaminated during extraction?
-If the soil sample is contaminated during extraction, the contaminated portion should be removed, and the sample should be collected again to ensure the integrity of the analysis.
How should the soil samples be divided if the auger has compacted the soil?
-If the auger has compacted the soil, the sample should be discarded, and new samples should be collected separately for the 0 to 10 centimeter and 10 to 20 centimeter depths.
What is the importance of collecting multiple soil samples to make one composite sample?
-Collecting multiple soil samples to make one composite sample helps to ensure that the analysis represents the overall soil conditions of the site, providing a more accurate assessment of the nutrient supply.
How should the composite soil sample be secured and labeled after collection?
-After collecting the composite sample, the bag should be secured, and the sample tag should be placed inside the bag and one outside for proper identification and record-keeping.
Outlines
🧪 Soil Sampling for Nutrient Supply Analysis
This paragraph details the process of collecting a soil sample for chemical analysis to understand nutrient supply. The narrator describes using a soil auger and other tools like a club hammer, a table knife, cloth sample tags, and bags, and a plastic tray. The soil sample is collected down to a depth of 10 centimeters, with the auger placed perpendicular to the land's slope. If the land is flat, the auger is used straight up and down. The soil sample is carefully extracted, ensuring no contamination, and then divided into different depth ranges for analysis. The importance of accurately sampling to represent the site is emphasized.
📦 Creating a Composite Soil Sample
The second paragraph explains the procedure for creating a composite soil sample after individual samples have been collected. The composite sample is secured in a bag with tags placed both inside and outside the bag. This step is crucial for ensuring the sample's integrity and for proper identification during analysis. The paragraph also mentions the use of music as a background element, indicating a multimedia presentation.
Mindmap
Keywords
💡Soil Chemistry Test
💡Soil Hopper
💡Sample Bag
💡Tag
💡Mineral Soil Surface
💡Sampling Depth
💡Contamination
💡Composite Sample
💡Soil Compaction
💡Plastic Tray
💡Rubber Mat
Highlights
Introduction to soil chemistry testing as a method for understanding nutrient supply.
Use of a soil hopper for collecting soil samples for chemical analysis.
Preparation of sample bags and tags for soil sampling.
Explanation of the correct angle for inserting the hopper core based on the land's slope.
Procedure for collecting a 10 cm soil sample using the hopper.
Technique for removing excess soil from the hopper core.
Instructions on how to collect a 20 cm soil sample using the same hole.
Use of a rubber mat for assistance when the hopper is hard to push down.
Importance of removing soil contamination from the core before bagging.
Process of dividing the soil sample into 0-10 cm and 10-20 cm sections.
Guidance on discarding and recollecting samples if the 0-10 cm layer is uncertain.
Emphasis on the need for collecting multiple soil samples to form a composite sample.
Instructions for securing the composite sample bag and tagging.
Importance of accurate soil sampling depth for reliable analysis.
Demonstration of how to handle soil core compaction during sampling.
Technique for ensuring the soil core is representative of the site.
Final steps in preparing the soil sample for chemical analysis.
Transcripts
one of the simple things we can do to
understand a site to nutrient supply is
to undertake a soil chemistry test but
this is the soil hopper a club hema a
table knife cloth sample tags and bags
and a plastic tray so we're now going to
collect a soil sample down to 10
centimeters or chemistry analysis using
the hopper first we get our sample bag
and tag ready and this here we've
already exposed the mineral soil surface
ready for sampling we then take the
hopper core and place it at right angles
to the slope of the land in this
situation the land is flat therefore the
hopper is straight up and down if the
land was sloping like this the hopper
core would go right angles to the slope
of the land so now we will take a naught
10 soil sample so push the core down to
10 centimeters which is March this line
here
goes down to the surface we carefully
pull it out
now we will remove the soil that is
stuck to the outside of the course and
that little piece there if it sticks
hard you can use the cloth to get it off
now we put the sample now back we push
the core up and place it in the day
[Music]
if you want to sample down to 20
centimeters you can use the same hole so
if we take the hopper carefully place it
back in and go down to 20 centimeters
marked here push it up if it becomes
hard pushing we can use our rubber mat
down to 20 centimeters and then
carefully removed
so we need to push that little bit up
because it's slightly come out remove
the soil that is that gaps on decor
including that piece there and just
check the top of the core material that
may have four men on top of this soil
call when you were extracting the core
so I'm just going to push that little
bit there back we then get our sample
bag which is down to 20 centimeters
really we push the call up you can see
there there's a little bit of
contamination there so we take that off
it was darker color and then we face
this a new back with the tag
in this example I have pushed the
prophec or down to 20 centimeters depth
and a nice soil core has come out
there's 20 centimeters depth there and
it has not compacted in this example
here the core has compacted as I push
the hopper down here's the 20 centimeter
mark so if we go back to hear when we
are dividing the sample up and to not to
10 and 10 to 20 we are very confident
that we can cut the call here place this
sample into the not to 10 bag and this
sample into the 10 to 20 bag in this
example we are uncertain as to where
nought to 10 as so this sample should be
discarded and you should go back to
taking the two bytes naught to 10 take
out the sample and then back to 10 to 20
and collect that sample to represent a
site that is important to collect a
number of soil samples to make one
composite sample
you
[Music]
after collecting the composite sample
secure the bag and place the tag inside
the bag and one outside the bag
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