Percentage of Organic Matter in Soil (Leaving Cert Agricultural Science): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is the main purpose of this practical?
What is the main purpose of this practical?
To determine % organic matter in soil
What piece of equipment is used to hold the soil sample during heating?
What piece of equipment is used to hold the soil sample during heating?
Evaporating basin
Why must the soil sample be pre-dried at 100°C for 48 hours?
Why must the soil sample be pre-dried at 100°C for 48 hours?
To remove moisture for accurate weighing
What observations indicate that organic matter is burning during heating?
What observations indicate that organic matter is burning during heating?
Smoke and burning smell
Why must heating continue until a constant weight is achieved?
Why must heating continue until a constant weight is achieved?
To ensure all organic matter removed
What formula calculates percentage organic matter?
What formula calculates percentage organic matter?
If original soil weight is 20.0 g and weight loss is 1.4 g, what is % organic matter?
If original soil weight is 20.0 g and weight loss is 1.4 g, what is % organic matter?
7.0%
What does organic matter in soil consist of?
What does organic matter in soil consist of?
Decomposed plant & animal material
What is the typical range of organic matter content in most Irish soils?
What is the typical range of organic matter content in most Irish soils?
2-10%
What happens to inorganic matter when soil is heated strongly?
What happens to inorganic matter when soil is heated strongly?
It remains stable