I have recommended a sample depth of 10 cm (4 inch) as long as I can remember. This has been collected from peat grass places for samples of soil feeding material analyzes. Sometimes I hear recommendations from others for different depths. This is a reminder that I recommend 10 cm.
My document with multiple pages of soil sample instructions recommends sampling to a depth of 10 cm (4 inches).
Here is a summary of one paragraph of the sampling instructions (from NotebookLM) with a focus on the sampling depth:
This document outlines the extensive soil sampling instructions from ATC, mainly for peatgrass areas such as golf courses, whereby the emphasis is placed on a precise methodology to guarantee accurate analysis for recommendations for fertilizer and to monitor changes over time. A critical aspect of these instructions is the sample depthwhat is generally recommended to be 10 cm (4 inch). This depth is measured from the bottom of the grass and the top of the ground or reedWith grass and reeds deliberately left on the sample for standardized removal by machines in the lab. Analyze Nutrient gradients through depthEspecially for one of the every five greens, a specific protocol requires the sample distributing Two segments: 0–5 cm (0–2 inch) and 5-10 cm (2-4 inch). This layered sampling helps to identify gradients in nutrients, pH and salt content, and to assess the impact of liming or acidifying treatments. The instructions emphasize the importance of maintaining a exact and consistent sample depth For the year-to-year comparisons to ensure reliable tracking of changes over time, and any non-standard depths must be discussed and clearly labeled.
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