Soil in the tropical rainforest's is very nutrient poor. The topsoil is only one to two inches (2.5 to 5 centimeters) deep. The only reason plant life is so lush is because the plants store the nutrients in themselves rather than getting them from the soil. When plants decay, other growing plants tap the nutrients from the dead matter and reuse nutrients left over from that plant. This is why farmers can only use the rainforest's soil for one or two years after they clear cut it, before all nutrients are stripped from the soil. The reason the soil so infertile is because it is more than 100 million years old, and has taken a beating from the elements. After time, rain washes minerals out of the soil, leaving it more acidic and nutrient poor. Soil exposed to the heat and condensed sunlight turns it into red clay. Other soils just cannot deal with minerals, and turn it into compounds useless to plants. There are some fertile patches of soil in the rainforest's, but they are scattered throughout the thick vegetation.
The soil type in the amazon basin is thicker then then andean rainforest it contains fertile layers of humus, which has three layers and it's contained in the amazon soil...
fertile crescent
because rice need fertile soil and ganga and brahmaputra basin contain fertile soil
The Fertile Crescent generally has a higher elevation compared to the Amazon basin. The Fertile Crescent is a region in the Middle East that includes parts of modern-day Iraq, Syria, Lebanon, and Jordan, while the Amazon basin is a low-lying area in South America covered by the Amazon rainforest.
Farmers in the Amazon River Basin have blamed mining for the cause of reduction in soil fertility. This part of the river once had large rain forests that were very fertile, if left alone. When the rain forest was cleared of vegetation it took all the nutrients from the soil with it.
the plain has a thick cover of alluvium. it has a very fertile soil...
caused soil erosion
thick vegetation
Amazon Basin, Rocks (scarce amount) Soil, Andes Mountains
Soil in the Congo River Basin is not fertile due to the over-irrigation from the river. This creates unstable land, like quicksand with a water to earth ratio of about 10 to 3.
it can soil that the soilis fertile
Lack of fertile soil is when an area doesn't have enough fertile soil (soil that can grow plants) to grow plants.