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This SOP describes a procedure for determining the pH of a soil using a soil-reagent water mixture and measuring the pH of the aqueous solution. This method is adapted from Method 9045D (US EPA, 2004) and Section 4.3 (USDA-NRCS, 2014).
For most soils, the pH range is 3–9. The desirable soil pH range for optimum plant growth varies among crops. Generally, a soil pH between 6.0-7.5 is acceptable for most plants, as most nutrients are available in this pH range (FAO 2021). Soil pH may be measured electrometrically with a pH meter. Water is the usual suspension medium for
5 lis 2018 · The pH is measured through its absorption properties in the visible region. The analysis of 60 soil samples showed that STISM and MTISM results correlate well with the ones obtained by GE. The STISM method, being more simple and general than the other two methods, is proposed for quick routine analyses.
1 wrz 2018 · Samples were stored in polythene bags and labeled with indelible markers. The samples were air-dried at room temperature away from direct sunlight, crushed using a porcelain mortar and pestle, and then sieved through a 2 mm sieve to separate the fine earth fraction (< 2 mm) from the coarse fraction.
8 kwi 2020 · Soil pH can be determined by an electrometric method (Jackson 1973) using a glass electrode pH meter in a 1:2 suspension of soil and water by using buffer solutions at pH 4.0 and 7.0, the pH read on pH meter.
2 sie 2017 · soil pH is important and outlines the impact of soil type and texture on pH. It describes how and when to test soils for pH, how to calculate the amount of lime or other neutralising materials required, which liming product(s) to use and how and when to apply them. Soil pH is a measure of the relative acidity or alkalinity of a soil.
When selecting a pH meter to test soil samples directly in the field, it is important to read the meter description and ask questions of the manufacturer to determine if the meter will work directly on soils in the solid state (paste-like soil samples) from a soil probe.
