The pie chart below shows the main reason why agriculture land become less productive. The table hoe these cause affected three regions of the world during 1990s.

The pie chart illustrates the cause of degradation of farmland in three different group. The most possibly cause of land degradation is over-glazing covering more than 1 of 3 of the world which is around 35 percent. The lesser possibly cause is deforestation which is estimated 30 percent ,and over-farming of crops around 28 percent, […]