Soil Testing Procedures and Indicators

The video tutorial demonstrates how to conduct chemical tests on soil samples using a Lamotte soil test kit. It covers the testing of nitrogen, phosphorus, and potassium levels, emphasizing safety precautions and the importance of precision. Each test is explained step-by-step, with guidance on how to avoid mixing chemicals and ensure accurate results.

What safety equipment is essential when conducting soil tests?

• Lab coat and mask

• Gloves and goggles

• Boots and apron

• Helmet and earplugs

Where is it recommended to perform the soil tests?

• In a garage

• In a kitchen

• In a laboratory

• Outside or on a table with a paper towel

What is the first step in the nitrogen test?

• Fill the test tube with nitrogen extracting solution

• Add soil to the test tube

• Add the indicator powder

• Mix the solution vigorously

How should you handle the pipette during the nitrogen test?

• Squeeze the bulb after placing it in the liquid

• Fill the pipette with soil

• Squeeze the bulb before placing it in the liquid

• Use the same pipette for all tests

What color indicates the presence of nitrogen in the test?

• Green

• Blue

• Yellow

• Pink

What is the main difference in the phosphorus test compared to the nitrogen test?

• The color of the final solution

• The type of pipette used

• The use of a different indicator powder

• The number of soil measures added

What color should develop in the phosphorus test?

• Pink

• Blue

• Green

• Purple

Why is it recommended to use two test tubes initially in the potassium test?

• To ensure enough liquid for the test

• To save time

• To use different indicators

• To avoid contamination

What color indicates a high potassium level before adding the test solution?

• Blue

• Red

• Yellow

• Purple

How many drops of potassium test solution indicate a medium-low potassium level?

• 10 drops

• 8 drops

• 12 drops

• 16 drops