Читать книгу Laboratory Methods for Soil Health Analysis, Volume 2 - Группа авторов - Страница 51

The same general principles that apply to soil sampling for nutrient evaluation apply to soil sampling for SOM determination. Soil samples should be collected to consistent soil depth(s), a consistent number of soil cores collected per composite samples should be maintained, thatch or mulch from the soil surface must be removed prior to sampling, composite samples should be inspected after collection and any obvious pieces of crop residue should be removed. Georeferenced points should also be collected within the field when possible. For all methods described below, soil samples should be dried at 35 to 40 °C in an oven and passed through a 2000‐μm sieve.