how does the fertility of soil decrease and leads to lower crop yield
Answers
Answer:
fertility of soil is mainly degraded due to the fertilizers and chemicals either directly used by the farmer or from industries etc.
When the farmer uses chemical fertilizers, pesticides etc ,they sink into the soil decreasing the natural fertility of the soil.
also, industries/factories release untreated chemical wastes on the land which sink into the soil and cause soil pollution or the untreated sewage they leave into the river ultimately may end up in soil causing soil infertility.
Soil pollution ultimately leads to lower crop yield due to the absence of required chemicals like K,Na,P in the soil.
Answer:
Soil fertility decline
Soil fertility decline occurs when the quantities of nutrients removed from the soil in harvested products exceed the quantities of nutrients being applied.
In this situation, the nutrient requirements of the crop are met from soil reserves until these reserves cannot meet crop demands. This results in a reduction of plant growth and yield.
Contributing factors
Nutrients may be removed from the soil by:
growing crops
soil erosion
leaching.
Nitrogen can also be lost from the soil as a gas by the process of denitrification.