Soil health

Healthy soil is a living system.

It is full of tiny living things. These small things help plants grow. They also help move food and water through the earth.

Farmers can help the soil stay strong. They can use plants to cover the ground. This acts like a blanket. It stops the soil from washing away.

Some people use compost to help. This adds good things back to the dirt. Healthy soil can also help keep our air and water clean. It is a busy home for many lives.

Soil is more than just dirt. It is a living, changing system.

Scientists call this soil health. Healthy soil works well with its environment. It helps plants and animals grow. It also keeps our air and water clean.

Many tiny living things live in the soil. We call these microbes. Some scientists think microbes control 80% of how nutrients move. In some grasslands, there are huge amounts of bacteria and fungi in the soil. These tiny lives make the soil strong.

Farmers can use special ways to help the soil. One way is using cover crops. These plants act like a blanket. They protect the soil from washing away. Another way is called crop rotation. This means planting different things in the same spot each year. This helps the soil stay rich. Some farmers also use no-till farming. This means they do not dig up the soil too much. This keeps the soil parts together. These steps help keep carbon in the ground. This is good for the whole planet.

Soil health is the state of a soil's ability to work well in its environment.

It is not just about dirt being good for growing food. Instead, it is about how living and non-living parts work together. These parts include plants, animals, and tiny microbes. A healthy soil functions like a self-sustaining system. It can support many different life forms at once. This includes helping plants grow and keeping our water clean. It also helps the air stay healthy by holding onto carbon.

Healthy soil works through many different cycles. One important thing is the cycling of nutrients, carbon, and water. Microbes, which are tiny living things, play a huge role here. Some scientists believe microbes control 80% of how nutrients move. In temperate grasslands, bacteria and fungi are found in very large amounts. These tiny lives help the soil stay productive. Farmers can help this process by using cover crops. These plants act like a protective blanket for the ground. They stop erosion and help the soil hold more carbon.

People have studied soil in different ways over time. In 1978, a Swiss biologist named Dr. Otto Buess wrote about soil health. He helped define the field we use today. Before this, people mostly talked about "soil quality." Soil quality usually meant how good soil was for one specific job. For example, it might be good for growing maize. But "soil health" is a newer, bigger idea. It looks at the soil as a whole, living environment. This shift helps us see the soil as a dynamic system.

Scientists use many tools to measure how healthy soil is. They look at things like CO2 release and humus levels. Humus is the organic part of the soil. They also check for available calcium and microbial activity. In the United States, Cornell University has offered soil health tests since 2006. A private lab in Maine called Woods End Laboratories has worked with soil since 1975. Some tests even look at "CO2-Burst" to see how microbes are breathing. These numbers help us understand if the soil is thriving or struggling.

Understanding soil health is like understanding human health. A healthy person has many parts working together to stay well. A healthy soil has biological, chemical, and physical parts that cooperate. This helps the soil resist damage and reach its full potential. When soil is unhealthy, it might lose its carbon or let nutrients leak out. This can cause pollution in our water. By using methods like regenerative agriculture, we can feed the soil instead of just the plants. This keeps the whole world a little bit stronger.

Soil health describes the capacity of a soil to function as a self-sustaining ecosystem within its specific environment. While people often think of soil as just a medium for growing plants, it is actually a living, dynamic, and ever-changing environment. A healthy soil is defined by the favorable interactions between its living components, such as microbiota, plants, and animals, and its non-living components. This state of health allows the soil to meet various ecosystem functions. These functions include sustaining plant and animal productivity, enhancing biodiversity, and maintaining high air and water quality.

The mechanism of soil health relies on complex biological, chemical, and physical processes. Central to this system is the cycling of nutrients, carbon, and water. Microbes, which are microscopic living organisms, play a massive role in these cycles. Some microbiologists believe that microbes control approximately 80% of all soil nutrient functions. In temperate grassland soils, the scale of this life is enormous. Bacterial biomass can reach 1 ton per hectare, while fungal biomass can reach 2 tons per hectare. These organisms process organic matter, which helps maintain the soil's structure and fertility through constant chemical and biological activity.

There are different ways to view the focus of soil health. An agronomic focus looks at how soil supports crop production and human nutrition. An ecological focus emphasizes soil biodiversity and the variety of life within the ground. An environmental or climate focus looks at how soil manages water and air quality, specifically through sequestering carbon. Sequestering carbon means the soil captures and stores carbon from the atmosphere. This process is vital for regulating the Earth's climate. Because different users have different goals, the benchmarks for what counts as "healthy" can vary depending on the context.

Historically, the way we talk about soil has changed significantly. Before the 1990s, scientists mostly used the term "soil quality." Soil quality was a narrow term used to describe how well soil performed a specific task, such as growing maize or providing a base for a road. The shift to "soil health" represents a more holistic and systematic view. This movement was influenced by organic and biological farming movements in Europe. A major milestone occurred in 1978 when Swiss soil biologist Dr. Otto Buess wrote "The Health of Soil and Plants." His work helped define the field by treating soil as a living whole rather than an inert medium.

Measuring soil health requires looking at specific ecosystem services and benchmarks. Scientists evaluate factors like CO2 release, humus levels, microbial activity, and available calcium. Modern testing often combines physical analysis, such as aggregate stability, with chemical mineral balance and biological respiration. One notable test is the "CO2-Burst," which measures biological soil respiration. In the United States, Cornell University has provided soil health testing since 2006. Woods End Laboratories in Maine has offered soil quality packages since 1985. These tests help determine if the soil is meeting its potential or if it is degrading.

One surprising and serious fact is the decline of soil carbon in the United States. Over the last 40 years, USA soils have lost up to 75% of their carbon, also known as humus. This loss causes biological fertility and ecosystem functions to decline. When soil loses its health, it can lead to negative off-site impacts. For example, excess nutrients like nitrates and phosphates can leak from the soil. This causes surface and groundwater pollution. In the early 2000s, pollution levels in the United States were reported to be the worst they had been since the 1970s.

To combat these issues, many use regenerative agriculture, which is a holistic approach to farming. This method focuses on feeding the soil rather than just feeding the plants. It uses practices like cover cropping, which provides a protective blanket of vegetation to prevent erosion. Crop rotation diversifies the nutrients and microbes in the soil. No-till farming minimizes physical disturbance to keep the soil structure intact. Permaculture is another design philosophy used to mimic natural ecosystems. These methods all aim to enhance organic matter and microbial activity to build a resilient, self-sustaining system.