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Determination of available potassium from soil.

TITLE -
Detemination of available potassium from soil. 
REAGENTS  -
 1) Neutral ammonium acetate -
Dissolved 77.1 gram ammonium acetate 900 ml water & adjust the pH to 7 by Acetic Acid or Ammonium hydroxide dilute to 1 litre.

2) preparation of standad solution.-
Dissolved 1.908 gram KCL in distal water. And makeup the final volume one litre. this solution called as stock solution.

3) Preparation working solution. -
Take 10 ml solution from stock solution and makeup volume 100 ml.

4) Preparation of standard series -
Prepare 0 2 4 6 8 10 ml of working solution ****
PROCEDURES  -
1) Take 5 gram of soil in conical flask.
2) Add 25 ml of neutral normal            ammonium acetate. 
3) Shake for 5 minut.
4) Filter the content. 
5) Take reading on flame photometer.

GRAPH FACTOR
Graph factor reading            Flame
Concentration.                      Photometer 
                                                 Reading. 

0                              -            
2                              -
4                              -
6                              -
8                              -
10                            -
Draw graph factor on graph paper & Calculate R. 
FORMULA   -
Available (k)  = R × flame Photometer reading × 
volume of extract × 2.24 ×100 ÷ weight of soil × 10 rest to six. 

Where, 
R.  -   is graph factor 

CALCULATION -
Available (k)  = R × flame Photometer reading × 
25 × 2.54 ÷ 5

Available (k) = R × flame Photometer reading × 11.2

RATING -

Very low.                 <100kg/hq
Low.                         100 to 150kg/hq
Medium.                   151 to 200kg/hq
Moderately high.      201 to 250kg/hq
High.                           251 to 300kg/hq
Very high.                   >300

RESULT -
ACCORDING TO SIX TIER, 
Given soil sample is - - - - - (ratings) in available Potassium content.


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