"The main problems in Africa have to do with soil fertility," he said.

But the growth of the cotton industry is bad news for soil fertility and the water table.

Further soil fertility and seed weight have to be taken into account.

"And knowledge isn't limited in the way that, say, soil fertility is."

This has reduced soil fertility and increased the need for fertilizer.

This may result in water pollution, but is the best way to restore soil fertility.

This leads to a reduction in soil fertility and productivity.

The nutritional content depends on season, growth stage and soil fertility.

As chemistry developed, it was applied to the investigation of soil fertility.

Furthermore, the increased soil fertility improves the results of agriculture.

Heavy fruiting and good soil fertility also favor disease development.

If the challenge is about future soil fertility and human health, we can develop a system based on nutrient recycling.

Zalingei is also known by its richness in soil fertility.

In all three cases the environmental problems addressed were deforestation, erosion, and soil fertility.

It can also serve as a fire break, a wind break, and to improve soil fertility.

Soil fertility would also be affected by global warming.

The non-burrowing earthworms play a different role in soil fertility.

The results include declining soil fertility and low yields.

It reduces soil fertility, crucial in a country of subsistence farmers.

A green manure is a crop grown mainly to improve soil fertility.

Elsewhere, soil management practices may not have any effect on soil fertility.

This knowledge is critical to understanding how food webs affect important qualities such as soil fertility.

One of the primary uses of cover crops is to increase soil fertility.

On flat land, harrowing is carried out to renew the soil fertility.

Critical to resources, soil fertility is critical to a successful agricultural economy.