Which of the following pairs of raw materials used in the canning industry ?

Microorganism that decompose organic matter will function best under

In an experiment to determine the percentage of organic matter in a soil sample, The following data was collected :
weight of oven-dried soil before burning =50g
weight of oven-dried soil after burning = 28g
Calculate the weight of organic matter in the soil

In an experiment to determine the percentage of organic matter in a soil sample, The following data was collected :
weight of oven-dried soil before burning =50g
weight of oven-dried soil after burning = 28g
Determine the percentage of organic matter in the soil

Which of the following practices will improve clay soil ?