Читать книгу Laboratory Methods for Soil Health Analysis, Volume 2 - Группа авторов - Страница 57

1 Air dry or oven‐dry soil at 35 to 40 °C.

2 Carefully remove all plant and animal materials from the soil using forceps.

3 Pass the soil through a 2000 μm sieve.

4 Weigh 10 ( ± 0.05) g of the soil sample in a tared 50 mL beaker and oven‐dry at 105 °C overnight. This process will ensure the removal of all water from the gypsum in gypsiferous soils.

5 Using a desiccator, cool the samples and then record the weight.

6 Transfer the oven‐dry soil (~10 ( ± 0.05) g) into a porcelain crucible, heat the samples in a muffle furnace for 2 h at 360 °C (after the temperature reaches 360 °C).

7 After the combustion, cool the samples to 150 °C in a desiccator before reweighing and recording the value