Plastic mulch

Farmers put thin plastic over the soil.

This helps plants grow better. It keeps the dirt wet. It also stops weeds from growing. Plants grow through small holes in the sheet.

Dark plastic can warm the soil. White plastic can keep it cool. This helps plants grow at the right time. It also keeps fruit clean. The fruit stays off the dirt. This helps stop fruit from rotting.

It is a smart way to farm.

Farmers use thin plastic sheets to cover the soil. This is called plastic mulch.

It helps crops grow in many ways. Dark plastic can warm up the soil. This helps plants grow faster in the spring. White plastic reflects heat to keep soil cool.

The plastic also keeps water in the dirt. This means farmers use less water for their crops. It stops weeds from growing by blocking sunlight.

Plants grow through small holes in the sheet. This keeps fruit, like strawberries, clean and off the dirt. It also helps prevent fruit rot.

Farmers use special machines to lay the plastic. A bed shaper makes rows in the soil. It also puts drip irrigation lines under the plastic. To plant, they use a waterwheel transplanter. This machine has drums with spikes. The spikes punch holes in the plastic. A person then places a plant in each hole. Using plastic costs more money for tools and work. It can also be hard to clean up. Some plastic stays in the soil. This can hurt earthworms and tiny microbes. Scientists are looking at biodegradable polymers. These are plastics that can break down naturally.

Farmers use thin sheets of plastic to cover the soil around their crops. This is called plastic mulch. It is a very useful tool in a way of farming called plasticulture.

This plastic helps plants grow in many helpful ways. It can stop weeds from stealing nutrients from the crops. It also helps keep water in the soil so plants do not get thirsty. Some plastic sheets even act as a barrier for chemicals in the dirt. This makes it a very important part of growing vegetables on a large scale.

Using plastic mulch works through several clever steps. First, a machine called a bed shaper makes rows in the soil. This machine also tucks drip irrigation lines under the plastic.

The plastic must be laid quite tight to work well. Next, farmers use a waterwheel transplanter to plant the crops. This machine has drums with spikes that punch holes in the film. As the spike hits the plastic, water flows into the new hole. A person then places a plant into that spot.

People began using plastic films for plants in the mid-1950s. Dr. Emery M. Emmert from the University of Kentucky was a pioneer. He saw how special plastics could help vegetable production.

In New Zealand, strawberry growers also started using plastic in the mid-fifties. By the years 1960 and 1961, all commercial strawberries there used black plastic. At first, farmers had to lay the plastic by hand. Later, they built their own machines in small workshops to help.

There are many specific facts about how different colors work. Dark or clear mulches catch sunlight to warm the soil. This helps plants grow much faster in the early spring. White mulch does the opposite by reflecting heat away. This keeps the soil cool during the hot mid-summer months.

Using plastic also keeps fruit like strawberries clean. The fruit stays on top of the plastic instead of touching the dirt. This helps prevent the fruit from rotting.

While plastic mulch is helpful, it also brings some hard jobs. It costs more money for the film and the special machines.

Removing the old plastic after harvest is also a big task. If the plastic is not cleaned up, it can stay in the soil. This can be bad for earthworms and tiny microbes. To fix this, scientists are studying biodegradable polymers. These are special materials that can break down naturally in the environment.

Plastic mulch is a specialized material used in a farming method known as plasticulture. It consists of thin plastic sheeting laid over soil to manage crop environments. This method is vital for large-scale vegetable production. Every year, millions of acres of land worldwide are cultivated using plastic mulch. It serves several purposes, such as suppressing weeds and conserving water. Some specific mulches even act as a barrier to keep methyl bromide in the soil. Methyl bromide is a powerful fumigant that can also deplete the ozone layer.

The application of plastic mulch involves a precise mechanical process. First, the field must be prepared as a flat seed bed. This means the soil must be free of large organic residue and soil clods. A machine called a plastic layer, or bed shaper, is then pulled across the field. This machine creates a row of soil called a planting bed. It uses a shaping box to form the bed and a roller to cover it with plastic. Two coulters, which are cutting tools, press the edges of the film into the soil surface.

During the laying process, the machine also places drip irrigation lines beneath the plastic. This allows for very efficient water delivery. The plastic must be installed tightly to prepare for the planting stage. Farmers often use a waterwheel transplanter to place the crops. This machine features rotating drums equipped with spikes at set intervals. As the spiked drum rolls over the bed, the spikes punch holes through the plastic film. A water supply fills the drum, so water flows into the hole as soon as it is punched. A worker on the transplanter then places the plant into the wet hole.

Different types of mulch are chosen based on the specific needs of the crop. Color plays a major role in how the mulch affects the soil temperature. Dark or clear mulches intercept sunlight to warm the soil. This warming allows for earlier planting and faster growth during the early season. Conversely, white mulch reflects heat from the sun. This reduces the soil temperature, which helps plants stay established during the heat of mid-summer.

The history of this technology began in the mid-1950s. Dr. Emery M. Emmert of the University of Kentucky was a pioneer in this field. He recognized the benefits of using low-density polyethylene (LDPE) and high-density polyethylene (HDPE) films. At the same time, strawberry growers in the Auckland area of New Zealand were also pioneering the use of polythene mulch. By the 1960-61 season, all commercial strawberries in New Zealand were grown using black polythene. Early machines were designed by farmers and built in small engineering workshops. These early machines were very similar to the specialized equipment used in modern agriculture today.

Plastic mulch provides many specific advantages for crop quality and soil health. It prevents sunlight from reaching the soil, which inhibits the growth of annual and perennial weeds. This reduces the need for mechanical cultivation, which helps prevent root damage. Because the plastic covers the soil, it also prevents rain and sun from causing soil crusting. This keeps the soil loose, well-aerated, and protected from erosion. Additionally, the mulch keeps ripening fruit, such as strawberries, off the soil. This contact reduction helps prevent fruit rot and keeps the produce clean.

Despite these benefits, there are significant economic and environmental challenges. Using plastic mulch is more expensive than planting in bare soil. Farmers must pay for the plastic film, specialized transplanters, and extra labor for installation and removal. There is also the problem of plastic disposal. If conventional polyethylene plastics accumulate in the soil, they can harm soil ecologies, including microbes and earthworms. While recycling technologies exist to turn old mulch into plastic resins, contamination by agrochemicals makes this difficult. To address this, researchers are looking at biodegradable polymers, such as aliphatic polyesters, which can be broken down by natural microbes in the environment.