2006-12-22 09:24:52 · 3 answers · asked by bluerosesea 1 in Science & Mathematics ➔ Earth Sciences & Geology
They can force their roots in and break up rocks. Some can enrich the soil with nitrogen. When they die or drop leaves this organic matter which is added to the soil and is churned up by worms. The roots can hold together loose soils to fix them and stop them blowing away. Some plants are acidic and will slowly dissolve limestone rocks. Others will take nutrients and minerals out of the soil making it poorer. These are just a few examples.
2006-12-22 09:41:52 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Besides breaking rocks and such, plants can revitalize soils. In the Medieval ages, people discovered that using a three field system allowed the soil to be more fertile. While grains take some nutrients out, they replace others. To replace the nitrogen they took out, legumes were planted where the grains had been and all crops traded fields.
2006-12-24 01:22:50 · answer #2 · answered by five_instruments_so_far 2 · 0⤊ 0⤋
Peter K is right
2006-12-22 19:34:48 · answer #3 · answered by jamaica 5 · 0⤊ 0⤋