THIS PPT COVERS ABOUT SOIL ERODIBILITY. ALSO COVERS ABOUT DETERMINATION OF ERODIBILITY .IN THIS IT COVERS ABOUT MAJOR 3 METHODS THEY ARE 1. IN SITU PLOTS 2 MESURING K UNDER A SIMULATED RAINFALL AND 3 PREDICTING K

1. PRESENTATION BY
UTKARSH JAIN

2.  ESTIMATE OF ABILITY OF SOIL TO RESIST EROSION.
 ERODIBILITY,E = (%SAND +% SILT)/% CLAY

3.  MAJOR 3 METHODS ARE:
1. USE OF IN SITU EROSION PLOTS.
2. MESURING K UNDER SIMULATED RAINSTORM.
3. PREDICTING K.

4.  ENABLE MESUREMENT UNDER FIELD CONDITION.
 MAKES USE OF STANDARD CONDITION OF BARE SOIL.
 NO CONSERVATION PRACTICE IS DONE.
 SLOPE : 7 DEGREES.
 LENGTH OF PLOTS : 22.13 M
 THIS METHOD IS COSTLY AND TIME CONSUMING.

5.  IS LESS TIME CONSUMING BUT RELATIVELY COSTLY.
 USES RAINFALL SIMULATOR .
 MESUREMENT : 1.8 M IN LENGTH AND WIDTH.
 3.8 M HIGH.
 NOZZLE PRODUCING WATER DROPLET CLOSE TO NATURAL
RAIN IS CHOSEN.
 WATER IS RELEASED AT LOW PRESSURE.

6.  WOODEN TRAY IS PLACED UNDER SIMULATOR.
 DIMENSION: 1M BY 2 M AND 15 CM DEEP.
 SLOPE : 7 DEGREE.
 COLLECTING SLOPE IS PLACED AT DOWNSLOPE END.
 DONE TO GATHER RUNOFF AND SEDIMENT.
 SOIL IS FURTHER SUBJECTED TO RAINFALL OF DIFF.
INTENSITIES.
 FINALLY TOTAL VOLUME OF RUNOFF AND SEDIMENT ARE
COLLECTED AND MESURED.

7.  MAY BE PREDICTED USING REGRESSION EQN.
 RELATION
4 1.14
100K =2.1 * 10 *(2 - OM) *M + 3.25(St - 2) + 2.5 (Pt - 3)
 HERE : OM = ORGANIC MATTER.
m = SILT + FINE SAND CONTENT.
St = SOIL STRUCTURE CODE.
Pt= PERMEABILITY CODE.