IAS Exam Preparation Through Environment Infographics (11)

IAS Exam Preparation of Environment via Infographics

You will be tested by UPSC on Questions relating to Environment. Bio Fertlizers and Green Manure are important topics from examination point of view.

Environmental Studies for IAS Exam Preparation 2016

Topic –  Bio fertilizers and Green Manure

What is a Bio Fertilizer ?

• Bio Fertilizer is a substance containing living microorganisms.
• It can be applied to seed, plant surfaces, or soil.
• Bio Fertilizer improves the supply of primary nutrients like nitrogen, Phosphorous etc. to the host plant, and thereby promotes its growth.

Important Examples of Bio Fertilizers

1. Rhizobium
2. Azotobacter
3. blue green algae (BGA)
4. Azospirillum
5. Nostac

Advantages of Bio Fertilizers

1. Bio Fertilizer increases crop yield by 20-30%,
2. replaces chemical nitrogen and phosphorus by 25%, and stimulates plant growth.
3. It provides protection against drought and certain soil-borne diseases.

Disadvantages of Bio Fertilizers

1. Their effects are is slower than chemical fertilizer.
2. Bio Fertilizers are sensitive to temperature and humidity changes, hence difficult to store.
3. They’ve much lower nutrient density than chemical fertilizers. Farmer would need to use large quantity to get the same yield.

Green Manure

• Green manure is a type of cover crop, grown to add nutrients and organic matter to the soil.
• Typically, a green manure crop is grown for a specific period of time, and then ploughed under and incorporated into the soil while it is green or shortly after flowering.
• Government of India provides subsidy Subsidy on the purchased of seeds & cost on production of seeds for green manure plants.

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Take the IA Quiz on Bio Fertlizers

1. A free living nitrogen fixing bacterium is ____________.

  Clostridium

  Azotobacter

  Rhizobium

  Both A and B

Question 1 of 5

2. A free living nitrogen fixing cyanobacterium which can also form symbiotic association with Azolla is ___________.

 Nostoc

  Anabaena

  Tolypothrix

  Gleocapsa

Question 2 of 5

3. A quatic fern which is an excellent biofertilizer ____________.

 Salvinia

  Azolla

  Marsilea

  Pteridium

Question 3 of 5

4. A neem product used as insect repellent is _____________.

 Azardirachtin

 Rotenone

  Endrin

  Parathion

Question 4 of 5

5. A biofertilizer which involves a pteridophyte host is______________.

 Rhizobium

 Anabaena

 Clostridium

  Azotobacter

Question 5 of 5

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Useful Links for Aspirants

HOW TO STUDY FOR ENVIRONMENTAL ISSUES FOR CIVIL SERVICES

CIVIL SERVICES PRELIMS – PATTERN, SYLLABUS AND RECOMMENDED BOOKS

HOW TO READ THE HINDU FOR CIVIL SERVICES EXAM

Suggested Reading

Infographic on El Nino & Its Effect Globally

references:mrunal.org