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Q: The water content of a highly organic soil is determined in an oven at a temperature of-
  • A. 27ºC
  • B. 60ºC
  • C. 80ºC
  • D. 105ºC
Correct Answer: Option B - Oven drying method–The oven drying method is a standard laboratory method. • This is very accurate method. • The soil sample in container is then dried at a temperature of 105-110ºC for 24 hrs in laboratory, above 110ºC water of crystallisation may be lost. • For soil containing significant amount of organic matter, a temperature 60ºC is recommended. • For soil containing significant amount of gypsum, a temperature 80ºC is recommended.
B. Oven drying method–The oven drying method is a standard laboratory method. • This is very accurate method. • The soil sample in container is then dried at a temperature of 105-110ºC for 24 hrs in laboratory, above 110ºC water of crystallisation may be lost. • For soil containing significant amount of organic matter, a temperature 60ºC is recommended. • For soil containing significant amount of gypsum, a temperature 80ºC is recommended.

Explanations:

Oven drying method–The oven drying method is a standard laboratory method. • This is very accurate method. • The soil sample in container is then dried at a temperature of 105-110ºC for 24 hrs in laboratory, above 110ºC water of crystallisation may be lost. • For soil containing significant amount of organic matter, a temperature 60ºC is recommended. • For soil containing significant amount of gypsum, a temperature 80ºC is recommended.