Calculate the percentage of organic matter in a soil sample using the following equation: %Organic matter = (PCSI - PCCI) / (PCSI - PC) (Ec.10)

The equation is used to determine the amount of organic material in a soil sample.
The sample is dried in an oven for 24 hours and then burned for 6 hours.
The equation uses the weight of the crucible and the sample before and after ignition.
The equation is only applicable to soil samples with grass and roots.
a) Statements 1, 2, and 3 are correct.
b) Statements 2, 3, and 4 are correct.
c) Statements 1, 3, and 4 are correct.
d) All statements are correct.