soil sceince

2. Soil productivity is defined as the capacity of soil, in its normal
environment, to support plant growth. Soil productivity is
reflected in the growth of forest vegetation or the volume of
organic matter produced on a site
Defination,
It is the capacity of the soil to produce crop yld under suitable
management practices is called SP.
SOIL PRODUCTIVITY

3. “ALL PRODUCTIVE SOILS ARE FERTILE ,
BUT ALL FERTILE NEEDS TO BE PRODUCTIVE”

4. Factors affecting soil productivity;
There are several factors which affect soil productivity
1. Nature of parent material.
Soil is formed from rocks and minerals through
disintegration & decomposition to form regolith then to soil

5. 2.Physical condition of soil and nutrient availabitity
Texture, structure, soil water, soil atmosphere, bulk density
& compactness
• There are 12 textural classes..
Sand- resistant wethering , less WHC & NHC
Clay- most susceptible to wethering, high WHC & NHC
Loamy- ideal for agricultural production, it is the mixture
of sand and clay in equal proportion.

6. •Granular structure is ideal for agricultural production
Interaction structure and texture give bulk density
If BD is more than 1.81 g/cc then it restrict the
germination of seeds
Soil having more BD have more compactness. And
also less OXYGEN DIFFUSION RATE.
Infiltration and perculation rate affected

7. •Soil water
It maintains turgidity of the soil.
Essential for enzymatic and microbial activity.
Vehicle for transportation of nutrients and CHO to
the plants

8. •Soil atmosphere
2 things, soil temperature and soil air
Microbial activity and enzymatic
 activity is dependent on this.
Ideal temperature for all crop plants
is 15-40 degrees

9. • Plant root growth and extension
Increase in Height , weight and dry matter
content of the plant is the growth.
Plant growth affected by two factors
Genetic factors- it is fixed
Environmental factors- it will varies.

10. •Organic matter content of the soil
Releases essential nutrients to the soil.
Having high CEC 215meq/100g of soil.
Acts as food for micro organisms & supply C &N to the
plants.
WHC & NHC of the soil is increased
It acts as buffering agent in the soil.

11. •Soil reactions.
Acid soils- the reactions involved are differs from alkaline soils
Al & Fe are involved here
Alkaline soils- it also differs Ca & Mg are involved here
•Soil erosion.
When soil is rich in sodium – act as desperse nature
If Ca & Mg rich then soil helps in compact holding
or shows binding property.

12. •Other factors
Sewage water irrigation , management of soil
amendments , water logged conditions , problematic
soils