Soil testing

Soil testing analyzes samples to estimate nutrient availability and properties such as acidity, salinity, and organic matter that affect plant growth.

Soil sampling: The collection of soil portions from selected locations and depths to represent a larger area. Representative sampling is necessary because soil properties vary across a field.
Fertilizer recommendation: Advice on nutrient types and application rates intended to meet crop needs. Soil-test levels are commonly translated into fertilizer rates.
Plant tissue analysis: The measurement of nutrient concentrations in plant tissues to assess plant nutrient status. It measures nutrients taken up by a crop, rather than nutrients estimated in soil.
Soil texture: The proportions of sand, silt, and clay in a soil. Texture affects nutrient retention and can influence sampling and test interpretation.
Soil nutrient variability: The spatial and temporal differences in nutrient concentrations within and among soils. Variation makes a single sample an imperfect representation of a field.
Soil pH: A measure of soil acidity or alkalinity based on hydrogen ion activity in a soil solution. Most routine tests measure pH because it influences nutrient availability.
Liming: The application of alkaline materials to raise soil pH and reduce acidity. A low-pH result can prompt lime recommendations.
Soil health assessment: An evaluation of soil's capacity to function as a living ecosystem and support plants. It considers biological and physical functions beyond routine fertility measurements.
Soil structure: The arrangement of soil particles into aggregates and the resulting pore spaces. Structure affects root growth and water movement, though routine chemical tests may not capture it.
Soil test uncertainty: The uncertainty in soil-test results arising from sampling, measurement, and interpretation. Every recommendation inherits uncertainty from the samples and methods used.

Linked from 9 pages