Millions of acres of land are cropland.

But there’s a big difference between a crop and a fertilizer.

“Fertilized soil is not a fertilizer, it’s a substrate,” said Kevin Linn, who directs the environmental and climate program at the U.S. Geological Survey.

Fertilizer is made up of nutrients, like nitrogen and phosphorus, which make plants grow.

Soils that are fertilized are also often more fertile, Linn said.

But if fertilized soil isn’t maintained and treated properly, that can cause the soil to become overgrown, and the plants are unable to grow.

It can also lead to pests, soil erosion, and soil fires, according to the USDA.

Foliage on some farms is often so dense that a fertilizer is necessary to keep it from getting stuck to roots and causing problems.

And the soil that’s used to fertilize that land is often very acidic, and is not good for plants.

The same goes for fertilized crops.

It’s more than just a fertilizer: Fertils contain nutrients like nitrogen, phosphorus, potassium, and other nutrients that plants need.

“The only thing that’s really required is that the fertilizer is available, and it’s available in the right quantity,” said Dr. Andrew Weil, an assistant professor of biological sciences at the University of Illinois at Urbana-Champaign.

But fertilizer is just one ingredient in a food system.

“We’re all using the same thing,” said Linn.

Soil also plays a role in the growth of other organisms, including plants and fungi.

But plants aren’t the only ones that depend on fertilizers.

Plants also use soil as a reservoir for nutrients and water, which can increase the nutrients available for plant growth.

“There are things that are just like fertilizer,” Linn explained.

Fruits and vegetables depend on a variety of plants to be able to grow, he said.

They also require fertilizer to grow properly, so plants must be fed the right amount of fertilizer and water.

Plants, for example, need to be fed more water and nutrients.

They can also be fertilized when they are young, or when they have roots that grow.

And they need to have the right kind of soil and fertilizer, he added.

But when plants get too much fertilizer, the nutrients that were supposed to grow in that soil can be lost, and that can lead to nutrient shortages, he explained.

“You’re feeding these plants less and less of what they’re supposed to get,” he said, explaining that it’s up to the plant to use its own nutrients and nutrients that are left over from fertilizing the soil.

In some cases, the plants that get enough fertilizer may not be able or unwilling to use all of the fertilizer it receives.

That’s because it’s not enough.

So if fertilizers are not being used correctly, the soil can become overpopulated and there can be soil fires.

Linn also noted that when fertilizers and water are used, they have to be applied on a consistent basis, because the soil in which the plants live is different from the soil around them.

“And the way we do it is by applying a certain amount of fertilizers at a certain time, and then gradually moving them back down the soil,” he explained, adding that in many cases, plants are able to use more fertilizer than they are able.

And that may mean that they can grow bigger and bigger without being able to take in all of it, Linds said.

He explained that because plants grow so quickly, the amount of nutrients that they are receiving from fertilizers is limited.

When fertilizers get to the plants, it takes them a long time to absorb all of those nutrients.

So it can take some time before the plant is able to harvest all of that nutrients.

That can lead them to have trouble in the long run.

And it’s important for farmers to have fertilizer on hand, Lintin said.

The U.K. government also recommends that farmers use a variety on their crops.

“It’s not always easy to know what the right balance of fertilizer, water, and nutrients is, and if you use too much, you’re going to burn the land,” Lintner said.

So Linn suggests using a variety that is the right mix of fertilizer, water and water when it comes to fertilizing your crops.

For example, the United Kingdom recommends using fertilizers that are both soluble and insoluble, and has a pH of about 3, Linc told LiveScience.

So for example in one garden, you could use a fertilizer with a pH range between 4 and 6, which is what the United States recommends.

“In some areas, it can be a little bit more difficult,” Linc said.

“If you’re just starting with a lot of fertilizer in a small area, and you want to do a lot