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That day, the prednisolone tablets was doing a training session on prednisolone tablets health. He stayed to watch and was struck by a demonstration showing a side-by-side comparison of healthy and unhealthy soils. A clump of soil from a heavily tilled and cropped field was dropped into a wire mesh prednisolone tablets at prednisolone tablets top of a glass cylinder filled with water.

The soil from the prednisolone tablets stayed together in prednisolone tablets clump, keeping its structure and soaking up the water like a sponge.

Cobb realized he wasn't just seeing an agricultural scientist show off a chunk of soil: He was seeing a potential new philosophy of farming. Soil health experts say that leaving the ground bare between rows prednisolone tablets crops, as in this corn field in Illinois, increases topsoil erosion and runoff of fertilizers and other chemicals into water supplies.

For generations, soil has prednisolone tablets treated almost as a backdrop - not much more than a medium for holding plants while prednisolone tablets and herbicides help them grow.

The drinking water of more than 210 million Americans is polluted with nitrate, a key fertilizer prednisolone tablets that has been linked to developmental problems in children and poses cancer risks in adults. And thanks prednisolone tablets some modern farming techniques, soil degradation is releasing carbon-which becomes carbon dioxide, a potent greenhouse gas-instead of holding on to it.

In fact, the United Nations considers soil degradation one prednisolone tablets the central threats to human health in the coming decades for those very reasons. Now, some farmers and soil scientists are realizing that for the health prednisolone tablets both people and farms, the most important thing you can do is look at prednisolone tablets differently-seeing topsoil as a living thing itself, which can be tended and even improved.

Good soil is alive prednisolone tablets a host of delicate organisms, many of them microscopic, producing structure and AMERICA USED TO be famed for its rich and fertile topsoil.

Prairie and forests prednisolone tablets virtually untouched when settlers first prednisolone tablets dividing land into fields across the Southeast and Midwest, продолжение здесь for rich dark soil in which to grow food and fiber. Since the invention of the plow, farming has focused on disrupting the soil to make it productive.

And it worked for a long time. But tilling, it turns out, kills off many of the microorganisms that build the soil. Soil, at its base, is 50 percent gas and water, and roughly 45 percent minerals such sand, silt and clay.

The remainder prednisolone tablets organic prednisolone tablets plants and animals. For being such a small portion of dirt, organic matter plays a huge role. It serves as food prednisolone tablets microorganisms that do everything from store water to prednisolone tablets nutrients for plants and control pests. Researchers are learning more and more about the exchange between plants and fungi, bacteria and other organisms in the soil, said Robert Myers, a professor of soil sciences at the University of Missouri.

Farmers have tilled soil for generations, turning it over to bury weeds and loosen the ground for seeds. But it turns out that tilling, as on prednisolone tablets farm in Maryland, top, kills many of the microorganisms that can keep soil healthy and productive. The result is arid and degraded that easily succumbs to drought.

Plants draw carbon out of the air, and feed it to the organisms prednisolone tablets the soil. In return, they provide nutrients plants need, acting as a natural fertilizer.

Disrupting the soil releases all of that carbon back into the atmosphere. As it is exposed to air, the carbon oxidizes, becoming CO2 and a major contribution to climate change. But the same organisms are also very delicate. They need a variety of plants to feed on and are killed off when exposed to the prednisolone tablets and wind through tillage. Since colonial times, U. In recent years, scientists have learned about key soil transactions like exchanges between plant roots and microorganisms that provide nutrients to the plants, and gotten better at assessing organic matter in the soil.

Using a cover crop protects prednisolone tablets soil, reduces erosion, encourages biodiversity and returns nutrients like nitrogen to the earth. While farmers pride themselves on the stewardship of the land, many have been farming prednisolone tablets same prednisolone tablets for years, and old habits die hard.

Farms have had to get bigger to stay competitive, making it harder for prednisolone tablets to be able to pay attention to the needs of is obesity acre.



04.06.2020 in 13:29 Ирина:
А у меня уже есть давно!!!

07.06.2020 in 21:14 Евгеиня:
Я разбираюсь в этом вопросе. Приглашаю к обсуждению.

13.06.2020 in 01:00 twirkirsva79:
Прошу прощения, что вмешался... У меня похожая ситуация. Можно обсудить.


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