Soil Fertility And Soil Depletion

1. Subject:Soil Science
Subject Code :SSC-101

2. My Topic is
Soil Fertility And Soil Depletion

3. Soil Fertility
Soil fertility is the capability of soil to supply nutrients
to plants in dequate amount and available from a
priductive soil must be fertile.

7. The following properties contribute to soil fertility
• Sufficient soil depth for adequate root growth and
water retention
• Good internal drainage, allowing sufficient aeration
for optimal root growth (although some plants,
such as rice, tolerate waterlogging .
• Soil pH in the range 5.5 to 7.0
• Adequate concentrations of essential plant
nutrients in plant-available forms

8. Factors determining soil fertility
The main factor that determine soil fertility
are:
Soil organic matter
Soil texture
Soil depth
Nutrient content
Storage capacity
Soil reaction
Absence of toxic element .

9. Types of Fertile Soil
There are three types of fertile soil:
Those are
1) Compost Soil
2)No-till Soil
3)Cover-crop Soil

10. Compost Soil:
Compost added to garden soil increases the living
organism population and therefore soil fertility.
No-till Soil
The no-till method of gardening reduces the
deterioration of soil fertility that occurs from
excessive disruption by shovels or machinery .
Cover-crop Soil
Cover crops are also called green manure. They
increase soil fertility by providing a constant source
of nutrients as the plants grow and as they
decompose.

11. Soil Depletion
Soil depletion occurs when the components which
contribute to fertility are removed and not
replaced,the conditions which support soil fertility
are not maintained .

12. Cause of fertility depletion in Bangladesh
Repid organic matter degradation for sub-tropical
humid climate .
Intensive cropping
unbalanced use of fertilizer
Soil erosion by wind and water
Leaching loss of nutrients during problem .

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