These are the methods, I am using for a long time and found most reliable

1. Urease activity : Douglas & Bremner (1970)

2. Lipase-Esterase activity : Margesin et al (2002)

3. Esterase activity : Schnurer and Rosswell (1982)

4. Phosphatase activity : Tabatabai and Bremner (1969)

5. Dehydrogenase activity:  ( Casida et al. 1964)

6. Arylsulfatase activity: Tabatabai and Bremner (1970)

7. Beta-Glycosidase activity : Jermyn, (1958) for fungi, Barnett et al. (1956) for yeast and Veibel (1950) for plants

8. Phytase activity : Asmar (1997), Tarafdar et al. (2001)

Dear Dr, Kafula, you can see the attached PDF. It will helpful for you

Thanks Malu

Dear Sir,

pl see these articles.

https://link.springer.com/article/10.1007/BF02181348

http://soilquality.org/indicators/soil_enzymes.html

Kundan Meshram thank you!

These are the methods, I am using for a long time and found most reliable

1. Urease activity : Douglas & Bremner (1970)

2. Lipase-Esterase activity : Margesin et al (2002)

3. Esterase activity : Schnurer and Rosswell (1982)

4. Phosphatase activity : Tabatabai and Bremner (1969)

5. Dehydrogenase activity:  ( Casida et al. 1964)

6. Arylsulfatase activity: Tabatabai and Bremner (1970)

7. Beta-Glycosidase activity : Jermyn, (1958) for fungi, Barnett et al. (1956) for yeast and Veibel (1950) for plants

8. Phytase activity : Asmar (1997), Tarafdar et al. (2001)

Dear Kafula:

You may see also the methodology as in the following ref.: 

Tabatabai, M.A. 1994. Soil enzymes. In: Weaver, R.W.,

Angle, J.S., Bottomley PS (eds) Methods of Soil

Analysis, Part 2. Microbiological and biochemical properties.

SSSA Book Series No. 5. Soil Sci. Soc. Am.

Madison, Wis. 775-833.

I agree with J. C. Tarafdar .

Thanks for J. C. Tarafdar recommendation.

Tarafdar and Mandal thanks for the recommendation.