1. Soil drill

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1. Stainless steel heart-shaped loam drill bit: made of manganese steel material, with a blade width of 4cm, a blade spacing of 6cm, a sampling length of 20cm, and threaded connection;

2. T-shaped handle: 35cm long, threaded connection;

3. Extension rod: 50cm long, threaded connection

4. Extension rod: 100cm long, threaded connection;

5. Scraper: 20mm wide for scraping soil samples;

6. Wrench: 19 × 22mm, used for disassembling and installing sampling drills;

7. Gloves: Good breathability on the back of the hand, made of cowhide material;

8. Steel tape measure: 3 meters;

Using cast iron chrome plated drill bits

There are two specifications: 1 meter and 1.2 meters, with an inner diameter of 25mm and an outer diameter of 30mm. The drill bit is crescent shaped and manually polished.

2. Ring knife, aluminum box

Ring knife specifications:

The material of the ring knife is stainless steel, and the upper and lower covers of the ring knife are aluminum

100ml ring cutter with a diameter of 50.46mm and a height of 50mm

The material of the handle is cast iron

Aluminum box specifications:

Specification: (Unit: mm)

40×20，40×25，55×35，60×60，70×38，80×60，100×50

3. Soil screening

There are three types of screen materials: stainless steel, nylon, and copper

There are three types of sieve diameters: 100, 200, 300, and 00mm

Mesh sizes of 0.075, 0.1, 0.125, 0.25, 0.5, 0.63, 1, 2, 5, 10mm can be customized

Formula for calculating soil moisture content:

Volume moisture content: the percentage of water volume to soil volume

Calculation formula: Volume moisture content (volume%)=Water volume/Soil volume * 100%

Quality moisture content: natural moisture content or absolute moisture content, the ratio of the mass of water contained in the soil to the mass dried

Calculation formula: Mass moisture content=(original soil weight - dried soil weight)/dried soil weight * 100%

Relative moisture content: The percentage of soil moisture content to the field water holding capacity of the soil

Calculation formula: Relative moisture content (%)=Soil moisture content/Field capacity * 100%

For example, suppose the instrument test shows a value of 45%, which is the volumetric moisture content, and then converted to the relative moisture content

The calculation formula is: relative moisture content (%)=volumetric moisture content (% by volume)/soil bulk density (usually between 1.1-1.5)

Assuming a bulk density of 1.5, the relative moisture content (%) is 30%, and the soil moisture content is equal to the relative moisture content (%) multiplied by the field capacity multiplied by 100%. Generally, the field capacity is 33%, which means the soil moisture content is 9%