( )Determination of soil moisture by gravemeteric method (over dry )

1. 15-20 ( 2 ).2. 105 ( 24 ).3. () 30-40 .

Calculation : ( + ) ( + ) (%) = X 100 ( + )

( ) :

+100 MCF = 100

Determination of soil moisture by volumetric method

= X

measurement of bulk Density

1. ( ) .2. . 3. :( = X )4. 105 .

Calculation : ( ) /3 = 3

1:5PH Measurement of 1:5 Soil water suspention

1. 10 250 50 .2. PH .

(1:5)Determination of water soluble salts by Electric conductivity in (1:5) soil water extract

1. 10 250 50 .2. .3. EC ( 1)Table 1 Temperature factors (fT ) for correcting electrical conductivity data on soil extracts to the standard temperature of 25 CEC25 = ECT X fT

0.92129.01.06022.01.6603.0

0.91829.21.05522.21.6134.0

0.91429.41.05122.41.5695.0

0.91129.61.04722.61.5286.0

0.90729.81.04322.81.4887.0

0.90430.01.03823.01.4488.0

0.90130.21.03423.21.4119.0

0.89730.41.02923.41.37510.0

0.89430.61.02523.61.34111.0

0.89030.81.02023.81.30912.0

0.88731.01.01624.01.27713.0

0.88431.21.01224.21.24714.0

0.88031.41.00824.41.21815.0

0.87731.61.00424.61.18916.0

0.87331.81.00024.81.16317.0

0.87032.00.99625.01.15718.0

0.86732.20.99225.21.15218.2

0.86432.40.98825.41.14718.4

0.86132.60.98325.61.14218.6

0.85832.80.97925.81.13618.8

0.84333.00.97526.01.13119.0

0.82934.00.97126.21.12719.2

0.81535.00.96726.41.12219.4

0.80136.00.96426.61.11719.6

0.78837.00.96026.81.11219.8

0.77538.00.95627.0 1.10720.0

0.76339.00.95327.21.10220.2

0.75040.00.95027.41.09720.4

0.73941.00.94727.61.09220.6

0.72742.00.94327.81.08720.8

0.71643.00.94028.01.08221.0

0.70544.00.93628.21.07721.2

0.69445.00.93228.41.07221.4

0.68346.00.92928.61.06721.6

0.67247.00.92528.81.06721.8

(1:5)Determination of water soluble salts by Drying method in (1:5) soil water extract

1. 10 250 50 .2. 15 .3. 20 110 4. .

Calculation :

=

= X

(%) = X 100

Determination of total corbonate by titration method

1. 1 250 .2. 10 HCl (1 ) .3. 70- 80 20 .4. 100 .5. 2- 3 .6. NaOH (1 ) .

Calculation : ( ) X CO3- (%) = X 100 X 1000

(1) HCl = X (2) NaOH = X ( ) HCl 100/2 = 501000 :

Determination of Active corbonate by using ammonium oxalate

1. 1 250 .2. 100 (0.5 ) .3. .4. 5 250 50 .5. 5 H2SO4 2- 3 .6. 70- 80 20 .7. (0.5 ) .8. : 5 250 .

Calculation :

( ) X X X CO3- (%) = X 100 X X 1000

() .() . 100/2 = 501000 : .

Determination of organic matter by walkley and Black method

1. 0.5 250 .2. 5 (1 ).3. 10 H2SO4 .4. 15 H2SO4 30 .5. 100 10 H3PO5 6. 1 .7. FeSO4.7H2O (1 ) .8. : 5 250 FeSO4.7H2O (1 ) .

Calculation : ( ) X FeSO4.7H2O X 3 100 100 (%) = X X X 100 1000 X 58 77

() FeSO4.7H2O .() FeSO4.7H2O . CO2 12/4 = 31000 : .100/58 : .100/77 : .

58% , 5.5% , 5.5% : = X (100/5.5)

( )Determination of carbon in Humic compounds ( humic & Fulvic acids ) :1. 10 500 .2. 200 NaOH .3. CO2 .4. ( 16-18 ) .5. 50 Na2SO4 .6. 15-20 ( ) . ( ) :1. 20-50 100 ( ) .2. 5 (1 ).3. 10 H2SO4 .4. 15 H2SO4 30 .5. 100 10 H3PO5 6. 1 .7. FeSO4.7H2O (1 ) .8. : 5 250 FeSO4.7H2O (1 ) .

( ) X 250 X FeSO4.7H2O X 3 100 (%) = X X 100 1000 X X 77

() FeSO4.7H2O .() FeSO4.7H2O . CO2 12/4 = 31000 : .100/77 : .

:1. 20-50 100 ( ) .2. 10 H2SO4 (1 ) .3. PH H2SO4 (1 ) (1.3-1.5)4. 70-80 ().5. .6. H2SO4 (0.1 ) .7. NaOH (1) (40-50 ).8. 100 .9. 5- 25 100 ( ) .10. 5 (1 ).11. 10 H2SO4 .12. 15 H2SO4 30 .13. 100 10 H3PO5 14. 1 .15. FeSO4.7H2O (1 ) .16. : 5 250 FeSO4.7H2O (1 ) .

(%) ( ) X 250 X FeSO4.7H2O X 3 X 100 X 100 = 1000 X X X X 77

() FeSO4.7H2O .() FeSO4.7H2O . CO2 12/4 = 31000 : .100/77 : .

: (%) = (%) - (%)

Determination of gypsum by turbidimetric method with the use of spectrophotometer Reagents :

: 40 4.1 0.83 800 28 . HCl (1:1) : 500 HCl 500 . (1000 / ): 0.5435 100 . (100,80,60,40,20 / ): 10,8,6,4,2 100 5 HCl (1:1) .

Procedure :

1. : /100 %

5:1151.29

10:1302.58

20:1605.16

30:1907.74

50:115012.9

2. 10 250 .3. .4. 1 ( / / ) 100 .5. 1 HCl (1:1) .6. 20 5 .7. (0.5 ) .8. 420 .

Calculation : :

(/ ) X / 100 = X 100 1000 X 1000 X

(/ ) X / 100 = X 100 X 5.375 1000 X 1000 X

5.375 : = CaSO4 . 2H2O (172) / (32) / 100 = %

%

2

2 : 10

10 : 25

25

Determination of Mineral Nitrogen by Kjeldahl method 1. 10 250 .2. 50 KCl (1 ) .3. 20 .4. 0.2 .5. .6. 50 H3BO3 .7. H3BO3 .8. .9. ( ) 0.2 .10. .11. 50 H3BO3 .12. H3BO3 .13. .

Calculation :

X X X = X ( / ) X

X X X = X ( / ) X

: 14 : = (100/ (100- ))

(/) = (/) + (/)

Determination of Nitrate- Nitrogen by UV photometric Absorption method

1. 10 250 .2. 50 .3. 10 ( / / ) 2 HCl (1 ).4. 206 ( ).5. .

Calculation : (/) = X X

( )Determination of available Phosphorus by spectrophotometer (Murphy method)

Reagents :

NaHCO3 : 42 800 1 PH 8.5 NaOH . () : 12 250 0.2098 100 1000 H2SO4 (5) ( 148 ) 2000 . () : 1.056 200 () ( 24 ). (1000 / ): 0.4393 100 10 100 100 / . (5,4,3,2,1 / ): 5,4,3,2,1 100 / 100 .

Procedure :

1. 2.5 250 50 NaHCO3 .2. 5 ( / / ) .3. 0.5 H2SO4 (5 ) .4. 15 5 () 10 ( ).5. ( / / ) 882 .6. .

Calculation :

X ( / ) =