Fertilizers

Q.

Write down to advantages of fertilizer over manure.

Q.

Explain various methods of fertilizer applications.

Q.

Distinguish between fertilizer and manure. Give suitable examples. What are advantages and disadvantages of using fertilizer ?

Q.

What are Manures? Give its classification.

Q. The process of preparing manure with the help of earthworms and kitchen waste is called _____.

1. green manuring
2. vermicomposting
3. manuring
4. farming

Q.

A farmer was advised not to use a particular type of fertilizer for his crop after harvesting a crop of peas. Give one reason for such advice. Name any two crops other than pea which would have shown the same effect.

Q. Comment on the following:
​Denitrifying bacteria are a blessing as well as a curse to farmers.​

Q.

What are fertilizers? Classify fertilizers.

Q.

Name two potassic fertilizers .

Q. Excess of nitrogen fertilizers leads to:

1. Pest problems
   
2. Growth problems
   
3. Fruiting problems
   
4. Flowering problems

Q. Manure the water holding capacity.

1. destabilises
2. decreases
3. increases

Q. Continuous use of chemical fertilisers can turn the soil ________.

1. rich with microbes
2. fertile
3. rich in organic content
4. infertile

Q. Which of the following is a synthetic source of nutrients?

1. Farm yard manure
2. Compost
3. Vermicompost
4. Fertilizer

Q.

Question 2
Why are manures and fertilizers used in fields?

Q.

Name the nitrogenous fertilizers .

Q.

How does chemical nature of the soil change due to continued use of chemical fertilizers ?

Q.

What will happen, when we use sodium nitrate excessively in the soil ?

Q.

Question 16
Which one of the following nutrients is not available in fertilizers?

(a) Nitrogen
(b) Phosphorus
(c) Iron
(d) Potassium

Q. Excess of nitrogen fertilizers leads to:

1. Pest problems
   
2. Growth problems
   
3. Fruiting problems
   
4. Flowering problems

Q. Question 16
Which one of the following nutrients is not available in fertilizers?

(a) Nitrogen
(b) Phosphorus
(c) Iron
(d) Potassium

Q. Which of the following is a synthetic source of nutrients?

1. Farm yard manure
2. Compost
3. Fertilizer
4. Vermicompost

Q. Question 23
Why is excess use of fertilizers detrimental for environment?

Q. Which of the following is a factor that differentiates fertilisers and manure?

1. Crop productivity
2. Water Pollution
3. Rich in nutrients
4. Disease resistance

Q. Farmers use chemical fertilisers in organic farming.

1. True
2. False

Q.

Give one disadvantage of fertilizers .

Q.

A farmer sows peas in his field after harvesting a crop of rice. Which agricultural practice is he following ?

1. Crop rotation
2. Multiple cropping
3. Field fallow
4. Mixed cropping

Q.

Which one is nutrient specific, fertilizer or manure ?

Q.

The figure shows the two crop fields [Plots A and B] have been treated with manures and chemical fertilizers respectively, keeping other environmental factors the same. Observe the graph and answer the following questions:
(i) Why does plot B show a sudden increase and then a gradual decrease in yield?
(ii) Why is the highest peak in plot A graph slightly delayed?
(iii) What is the reason for the different patterns of the two graphs?

Quantity of amendment

Q.

Name one inoraganic nitrogenous fertilizer.

Q. 'X' is a source of nutrients for plants. It is prepared by the decomposition of plant waste and animal excreta. Given below are few uses of X. Identify the one which is not a use of X.

1. It increases soil fertility.
2. It increases soil microflora.
3. It prevents weathering of rocks.
4. It increases water holding capacity.