Why is agriculture in grasslands more productive than agriculture in rainforests? (Site 1)

Soils in grasslands have a deep A horizon from the accumulation of organic material that dies back every year. This is what makes these soils so good for agriculture. In tropical rain forests the A horizon is very shallow because of rapid decomposition of dead material and leaching due to heavy rainfall

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.