Soil analysis for individuals: understand your soil to improve your gardening or farming

Better understand the nature of your soil (pH, fertility, texture…)

The primary motivation for analyzing one's soil as a homeowner is to determine its composition. This begins with assessing the soil's pH, or acidity level. A pH between 5 and 7 is considered ideal for plant growth. A low pH indicates acidic, infertile soil that struggles to absorb water.

Soil texture also plays a role in plant growth. Certain soil types are better suited to certain plants. For example, sandy soil is ideal for bulbous plants, asparagus, and root vegetables such as carrots, beets, turnips, and potatoes. If you have humus-rich soil, the choice is less restrictive, as this type of soil is rich in humus and fertile, making it suitable for all plants.

Identifying invisible blockages or deficiencies

The second reason for soil analysis for individuals? To detect blockages or deficiencies in the soil. For example, soil poor in minerals, low in earthworms and other beneficial organisms, and in which roots develop poorly will be infertile. This analysis can be carried out without extensive investigation, aside from checking the chemical composition: presence of calcium, magnesium, potassium, sodium, etc.

Optimizing your plantings and avoiding failures in the garden

Knowing your soil will also guide you towards the appropriate types of plants. This will allow you to enjoy a vegetable garden, flowering meadows, or fruit trees suited to the nature of your soil: clay, silt, sand, or humus-rich.

Securing a purchase, construction or vegetable garden project

If you're planning to buy land, build a house, or start a vegetable garden, have your soil tested. This is essential to rule out potential pollution and the presence of pesticides, VOCs, hydrocarbons , and other PFAS. These compounds can make consuming your produce harmful to your health and the health of your family, especially if you water your garden with water from a well or groundwater source that may itself be polluted.

Basic analysis (texture, pH, organic matter)

Essential basic soil analysis includes indicators such as pH (acidity level) and soil texture. This type of investigation can be carried out yourself without professional equipment. Organic matter (OM) content is a bit more difficult to determine. It requires analyzing total organic carbon, which can only be done through laboratory testing.

Complete analysis (nutrients, CEC, pollution)

In addition to pH and soil texture (particle size), a complete soil analysis can be beneficial, especially if you plan to grow your own vegetables and consume your produce. Elements to look for include:

• Nutrients include macro-elements such as nitrogen, phosphorus, and potassium, and meso-elements such as magnesium, calcium, and sulfur.
• CEC, or cation exchange capacity, is a measure of soil fertility. It determines whether plants have enough nutrients to grow or if there are deficiencies.
• Finally, the presence of pollution is also analyzed. Among the most frequent harmful compounds are heavy metals, hydrocarbons, pesticides produced by intensive agriculture, and PFAS, also known as perennial pollutants.
  
  

At-home testing kits vs. sending to the lab

Soil testing kits are commercially available. While these can be useful for indicators like pH or soil texture, determining nutrient content, the presence of pollutants, or soil fertility levels is more difficult without laboratory analysis.

Simple packages offered by Pouryère

Less expensive than a full soil analysis, sampling kits offer a reliable solution. You collect the soil sample yourself and then send it to a laboratory for a complete analysis. Pouryère, for example, offers the Solkit, which provides a comprehensive assessment of your soil's health. It detects the presence of pollutants (heavy metals, hydrocarbons, etc.) as well as pH, soil texture (clay, silt, sand, etc.), chemical balance, and nutrient content.