Sustainable agriculture

Sustainable agriculture is a way of farming that helps protect the environment and makes sure we can keep growing food for many years. It means using methods that do not harm the land, water, or air, and that support nature.

Farming can sometimes cause problems like climate change and pollution. Sustainable agriculture tries to avoid these problems. It includes many different practices, such as growing many types of crops together, letting land rest between crops, and mixing trees with farms. These methods help keep the soil healthy and protect animals and plants.

By using sustainable agriculture, we can grow enough food for more people while taking care of our planet. Changing what we eat to include more sustainable foods also helps reduce harm to the environment. There are many rules and certifications, like organic certification and Fair Trade, that help make sure farms are following these good practices.

Definition

Sustainable agriculture began in 1977. The USDA said it is a way of farming that fits each place’s needs. This kind of farming tries to:

• give people enough food and clothes
• keep the environment and natural resources healthy
• use resources wisely and work with nature’s cycles
• help farms stay successful and make money
• improve life for farmers and everyone

Many indigenous communities have practiced sustainable farming for years before it had a name.

Aims

Sustainable farming helps feed more people around the world. It thinks about how farming affects the environment and communities. With fewer resources, better technology can help farms grow more food.

The main ideas behind sustainable farming include using nature’s processes, like renewing soil and recycling nutrients. Farmers should use fewer harmful things and work together to solve problems such as pest control and watering crops. This way, farming can support both the land and the people who depend on it for a living.

Technological approaches

Sustainable farming is getting a lot of attention in artificial intelligence (AI) research. AI can help farmers use resources better, watch over crops, and predict how much they will grow. For example, AI can control watering systems by using sensors to check soil and weather, saving water. AI can also help farmers test their soil and spot problems like weeds or sick plants.

One way to make farming better for the planet is called agrivoltaics. This means growing crops under solar panels, which makes clean energy while saving land and helping farms stay friendly to nature.

Environmental factors

Farming can sometimes hurt the soil if not done carefully. Plowing too much can wash away soil, and watering without proper drainage can make the soil too salty.

The most important things for a farm are the climate, soil, nutrients, and water. Water and soil are the easiest for people to manage. When farmers grow crops, they take nutrients from the soil. If these nutrients are not put back, the soil becomes poor and cannot grow good crops. Sustainable farming means adding back what was taken, while using as little as possible of things we cannot make more of, like natural gas.

A farm that only works for now but hurts the environment somewhere else is not truly sustainable. For example, adding fertilizer can help crops grow but can also pollute rivers and lakes.

Nutrients

Nitrates

Nitrates are often used in farming to help crops grow. But too many nitrates can leak into the environment. We can get nitrates in other ways, like using crop waste, animals, or certain plants that work with special bacteria.

Other ways to keep soil healthy include rotating crops, flooding fields to bring back nutrients, using special charcoal in soil, and choosing plants that grow well even when the soil is poor.

Phosphate

Phosphate helps plants grow and is very important. It is found in soil but is often used up by farms. Phosphate comes from rocks, but there is only so much of it.

Potassium

Potassium helps plants hold water, taste better, and stay healthy. It is used a lot in farming, but too much can hurt soil.

Soil

Soil is very important for farming, but it is being lost in many places. Good soil management includes not plowing, planting trees to block wind, and adding organic matter back to the soil.

Land

As more people need food, there is more pressure on land. Using land badly can hurt it and make it hard for poor farmers.

Energy

Farming uses a lot of energy for machines, processing food, and moving it around. It is important to use cleaner energy, like solar power, to keep farms working.

Water

Some places get enough rain for crops, but others need to water their fields. Farmers need to find ways to use less water, like choosing crops that need less water and saving rainwater.

Social factors

Sustainable agriculture tries to solve many problems. It aims to reduce harm to the environment from farming while growing more food. There are different ways to do this, like letting markets decide what to grow or making sure everyone can access food. Helping poor farmers grow and stay strong is one good idea.

Long ago, in the early 1900s in rural America, Dr. George Washington Carver taught farmers better ways to grow food. He traveled in a special wagon to show farmers how to rotate crops, use compost, and keep soil healthy. His ideas still influence farming today.

In 2007, the United Nations talked about how organic farming could help provide food for everyone in Africa without harming the land more. When people are left out of farming plans, it can cause big problems. Sustainable farming means being able to feed people for a long time.

Farmers can make more money and help their communities while keeping the land healthy. In Uganda, scientists test special plants called genetically modified organisms to protect bananas from disease. This could help families keep their crops safe.

Some places aren’t easy for farming, but new technology helps. In Nepal, greenhouses let farmers grow crops even in cold, high places. These greenhouses save water. Desalination, a process that turns salt water into fresh water, can give crops the water they need, though it costs a lot of money.

From 1978 to 2007, the number of women who run farms in the United States tripled. In 2007, women ran 14 percent of farms. Many of these women farm in ways that are different from traditional methods.

Growing food in backyards, schools, and communities became common during World War I, the Great Depression, and World War II. People started doing this again during the COVID-19 pandemic. It’s a good way to grow food sustainably and help poor people get access to food.

Main article: Urban agriculture

Economic factors

Costs like environmental problems that aren't included in regular accounting systems are called externalities. These costs are important to think about when we talk about farming.

Some studies look at how farming affects nature, like intensive agriculture in small farms called smallholder systems. They try to measure the value of things like clean air and water. Projects like The Economics of Ecosystems and Biodiversity and the Economics of Land Degradation Initiative help us understand this better.

A good future depends on using resources wisely and making sure everyone has a good life. This means balancing what we need now and what we need for the future, helping equity and improving quality of life. One report from the United Nations showed that hunger has been growing. Investing in sustainable farming can be a smart way to help.

Challenges and debates

Sustainable agriculture has many challenges in three main areas: social, environmental, and economic.

Social challenges include changing how people think and act, getting farmers to work together, and creating rules or rewards for new farming methods. Both farmers and consumers need to change their habits, which can be hard when they are used to old ways.

Environmental challenges involve protecting nature while farming. Using chemicals to kill pests can harm people and wildlife, and climate change can make farming harder in some places. It also takes time to see the benefits of gentler farming methods, unlike traditional farming which shows quick results but can hurt the land later.

Economic challenges include making sure farming that helps the environment can also make enough money. Switching to sustainable methods often costs more and produces less, while traditional farming can produce more quickly and profit more easily. Some believe that buying and eating local food, along with community gardens, can help support sustainable farming. There are also different ideas about what sustainability means, with some focusing on working with nature and others on using technology to improve farming.

Methods

Other practices include polyculture, growing many different plants in one field. This helps plants stay strong and keeps the soil healthy. Plants called legumes can add nutrients back into the soil.

Sustainable ways to manage unwanted plants may help stop them from becoming hard to control. Crop rotation can help the soil stay rich in nutrients if legumes are part of the rotation.

There are many ways to care for animals in a sustainable way. Tools for managing where animals graze include creating smaller areas called paddocks and moving them often between these areas.

Combining different farming methods is becoming more popular because it can help farms work better and harm the environment less. This idea of mixing farming activities is important for making farming more sustainable.

Intensification

Main article: Intensive farming § Sustainability

Growing more food is a goal of intensification. Sustainable intensification means using farming methods that grow more food while also helping the environment. These methods improve how the farm works without costing the Earth. With concerns about food security, human population growth, and less land available for farming, sustainable intensive farming is important to keep high crop yields while keeping soil health and ecosystem services strong.

Vertical farming is an idea that could let farms produce food all year and save on transportation.

Water

Water efficiency can be improved by using less irrigation and trying other methods. These include studying crops that can live with less water and watching how plants use water.

Crops that can handle drought have been studied to solve water shortage problems. These crops are changed so they can live in dry places, which saves water. Some types of rice have been changed to handle drought better.

Soil and nutrients

Soil amendments mean adding things to the soil to help it. Using compost from things like yard and kitchen waste uses materials that are already available.

Not tilling the soil before planting and leaving plant remains after harvesting helps keep soil from drying out and protects it from being washed or blown away.

Leaving plant remains on the soil can help keep water from evaporating and lower the soil temperature.

A way to make rock phosphate work better is to add tiny living things called phosphate-solubilizing microorganisms, or PSMs, to the soil. These tiny helpers can free up phosphorus that plants need to grow.

Phosphorus is used even better when mycorrhizae are in the soil. Mycorrhiza is a friendly partnership between plants and fungi that are great at taking in nutrients, including phosphorus, from the soil.

Pests and weeds

Soil steaming can be used instead of chemicals to clean the soil.

Solarizing works on the same idea, using heat to kill bad germs and pests.

Some plants can be grown to act like natural pest control. When these plants are crushed, mixed into the soil, and covered with plastic, they release substances that fight pests. Plants in the Brassicaceae family release substances that can fight pests.

Location

Moving farms to places where the environment is better, while letting ecosystems in the old places regenerate, could greatly reduce the impact of farming on carbon, wildlife, and water use.

Plants

Sustainability can also mean crop rotation. Rotating crops and planting cover crops helps protect topsoil from wind and water damage. Good crop rotation can lower pest problems, control unwanted plants, reduce sickness in crops, and make soil nutrients work better. This means farmers can use fewer fertilizers and pesticides. Growing many different crops by using new genetic resources can raise yields. Perennial crops help reduce the need to till the soil, which protects soil from washing away, and they can sometimes handle drought better. Researchers are trying to create perennial versions of common crops.

Landscape management strategies

Sustainable agriculture can help manage the whole area around farms, not just the fields. This protects nature while still growing enough food. There are two main ways people think about this: land sparing and land sharing.

Land sparing means using some land only for farming and keeping other land wild to protect animals and plants. This often means farming more on the land used for crops.

Land sharing, also called wildlife-friendly farming, tries to mix farming with nature. This can include growing trees among crops or raising animals together with plants.

Recently, a new idea called land blending has been suggested. This is a mix of the two approaches, changing based on what works best in each place. It aims to balance protecting nature with growing food.

Related concepts

Organic agriculture

Main article: Organic Farming

Organic agriculture is a way of farming that works with nature. It does not use man-made chemicals like pesticides and fertilizers. It also does not use plants or animals that have been changed in a lab. The goal is to keep the soil healthy and protect the animals and plants that live there. Some people believe organic farming is a great way to grow food that is good for the Earth.

Ecological farming

Ecological farming helps the environment while growing food. It includes many methods, such as organic farming. These methods help keep soil in place, let water soak into the ground, and add more carbon to the soil. Ecological farming also helps animals and plants around farms to grow. Farmers can use different ways to grow crops, like not digging up the soil, planting different crops together, and using natural ways to keep pests away.

Traditional agriculture

Traditional farming methods have been used for thousands of years. Some of these methods are good for the environment. For example, in some places, people grow rice and fish together. The fish help keep the water clean and give extra food. In other areas, people grow crops in special raised beds to make the soil richer. These methods help the land stay healthy and grow more food.

Regenerative agriculture

Main article: Regenerative agriculture

Regenerative agriculture is a way of farming that makes the land healthier. It focuses on making the soil richer, increasing the plants and animals that live in the soil, and helping water move better through the land. This helps the land stay strong and grow food even when the weather changes. Farmers use methods like reusing waste from the farm and adding rich soil from outside to keep the land healthy.

Standards

Certification systems help farmers and shoppers know if food is grown in a way that helps nature and people. There are many rules, like organic certification, Rainforest Alliance, and Fair Trade, that guide farmers on growing food safely for people and the Earth. These rules make sure that growing food does not harm the environment or workers.

The USDA creates an organic label for food in the United States. Farmers must follow a special plan to earn this label, and they are checked each year to make sure they keep following the rules. This helps make sure that people get food that is grown in a healthy way.

Policy

Sustainable agriculture is an important topic because it helps protect the environment. In 2011, a special group said countries should include it in their plans. They said as weather changes, farming needs to become stronger.

In 2021, 45 countries agreed to give more than 4 billion dollars to help farming become more sustainable.

In May 2020, the European Union started a plan called "From Farm to Fork." The plan has goals for 2030, like making 25% of farming organic and cutting down on certain chemicals. It also wants to reduce food waste.

In the United States, farming policies have changed over time. Newer ideas include the Green New Deal. This plan suggests helping smaller farms grow in ways that care for the land.

In China, the government made a plan in 2016 to eat less meat. They also started a program in 2019 to help small farms use better methods.

In India, groups work to make farming more sustainable. The Sowgood foundation teaches children and schools about growing food in a healthy way.

In Israel, the government supports sustainable farming and helps smaller farming communities learn better ways to grow food.

History

In 1907, an American writer named Franklin H. King talked about farming in ways that help nature. He said these methods would be important later. An Australian expert named Gordon McClymont is said to have first used the words "sustainable agriculture." The idea became more well-known in the late 1980s.

For a long time, people have worried if we can grow enough food for everyone. This worry grew in the late 1900s and early 2000s as more people lived on Earth. Farming uses a lot of land, water, and work. Many people started to worry if we could keep growing enough food. This led to important talks about making sure everyone has enough to eat.