(a) The two crops that are commonly cultivated under the bush fallowing system of farming in Nigeria are yam and cassava.
(b) The bush fallowing system of farming in Nigeria is characterized by the following:
- It involves clearing a piece of land by cutting down trees and bushes.
- The land is then left uncultivated for several years to allow natural regeneration of the vegetation.
- After several years, the land is again cleared and crops are planted.
- The system is usually practiced by small-scale farmers.
- The system allows for the conservation of soil nutrients and improves soil fertility.
(c) The disadvantages of bush fallowing system of farming in Nigeria include the following:
- It requires large areas of land to be cleared for farming, which can lead to deforestation and loss of biodiversity.
- The long periods of fallow can lead to a loss of income for farmers.
- The system can be labor-intensive, as it requires clearing and planting of new areas every few years.
- The system may not be suitable for crops that require continuous cultivation, such as vegetables and fruits.