What is the minimum soil depth required for agricultural production?
10 mm
100 cm
150 mm
150 cm
How long does it take for natural processes to replace 25mm of topsoil?
10 years
25 years
100 years
500 years
Universal Soil Loss Equation predicts the amount of soil losses that may occur from:
Wind erosion
Rill erosion
Gully erosion
Tillage erosion
Rain falling on which of the following area causes minimal soil erosion?
Frozen soil
Ploughed soil
Land with partial crop cover
All of the above
Which of the following dominates in land degradation?
Degradation by wind and water erosion
Physical degradation
Chemical degradation
Biological degradation
What is the process of establishing a forest on land that is not a forest called?
Afforestatiion
Reforestation
Carbon farming
Sustainable agriculture
What is the informal geologic chronological term for the period that serves to mark the evidence and extent of human activities that have had a significant global impact on the Earth's ecosystems?
Cretaceous
Holocene
Anthropocene
Jurassic
The act of farming using principles of ecology, the study of relationships between organisms and their environment is known as:
No-till farming
Afforestation
What is the estimate of the ability of soils to resist erosion called?
Gradient
Erodibility
Salinity
Soil buffering capacity
What is process by which pH value of the soil decreases over time called?
Acidification
Salinization
Soil pollution
Carbonization