Role of Organic Manures in Soil Management

Q.

Why is earthworm called nature's plough men?

Q. Excessive use of fertilisers can make the soil less fertile. So, to maintain fertility we can enrich the soil with nutrients by:

1. Using manures
2. Crop rotation
3. Irrigation
4. Leaving the land uncultivated

Q. Crop rotation is the successive cultivation of different crops in a specified order on the same field to retain or enhance soil fertility.

1. True
2. False

Q.

Vermicompost is eco-friendly because:

1. Vermicompost does not alter the quality of the soil quality unlike chemical fertilizers

2. Earthworms consume less food and produce vermicompost

3. Earthworms consume left overs and produce vermicompost

4. Earthworms consume microbes and vermicompost is microbe free

Q.

Which crop is generally grown in between two cereal crops to restore the fertility of the soil?

Q.

Question 48
Fertile soil has lots of humus. Why?

Q. Which among the following is/are the advantages of organic manure?

1. It increases erosion of top soil .
2. It helps in the circulation of air.
3. It increases plants nutrition level.
4. It decreases microbial acitivity.

Q. Rahul wants to perform a type of farming which strictly limits the use of chemical fertilizers and pesticides. Which among the following techniques should he rely on?

1. Crop rotation
2. Green manure
3. Use biofertilizers
4. Unirrigated farming

Q. ____ is a well-decayed organic matter rich in humus and nurients.

1. Biofertiliser
2. Chemical fertiliser
3. Herbicide
4. Compost

Q. Which of the following can be an analogy to earthworm in agriculture?

1. Harvestor
2. Plough
3. Seed drill
4. Thresher

Q. Fill in X, Y, Z

$\begin{array}{ccc}\text{Types of Biofertilizer}& \text{Microorganism}& \text{Useful for crops}\\ \text{X}& \text{Rhizobium}& \text{Non - legume crops}\\ \text{Y}& \text{Bacillus}& \text{All Crops}\\ \text{PGPR}& \text{Z}& \text{Many crops}\end{array}$

1. X - Compost biofertilizer Y - Nitrogen biofertilizer, Z - Pseudomonas
2. X - Nitrogen biofertilizer, Y - Phosphorus biofertilizer, Z - Pseudomonas
3. X - Phosphorus biofertilizer Y - Pseudomonas, Z - Penicillium
4. X - PGPR, Y - Compost biofertilizer, Z - Aspergillus

Q. Organic manure is considered better than fertilizers. Which of these is true regarding organic manure?

1. It improves the texture of the soil
2. It contains harmful chemicals
3. It is more expensive
4. It decreases the water retention

Q. The farming technique in which there is no or minimal use of chemical fertilisers, herbicides and insecticides, is called ______.

1. synthetic farming
2. mixed farming
3. artificial farming
4. organic farming

Q. Which of the following is incorrect for green manure?

1. It supplies organic matter.
2. It supplies nitrogen.
3. It prevents soil erosion.
4. It allows leaching.

Q. Which among the following improves soil fertility and plant growth without causing water pollution?

1. Potassium nitrate
2. Azotobacter
3. Ammonium sulphate
4. Superphosphate

Q.

Since excessive use of fertilizers can harm the soil, we can enrich the soil with nutrients by ___ .

1. All of the above

2. Leave the land fallow

3. Crop rotation

4. Using manure

Q.

Manure enhances the _______ of the soil.

1. colour

2. fertility

3. smell

4. texture

Q. Which of the following highlight the significance of humus in soil?

1. It is used to improve the soil structure.
2. Humus promotes soil erosion.
3. Humus helps to retain water.
4. Humus increases the nutrient level.

Q. Organic farming does not include:

1. Green manure
2. Chemical fertilisers
3. Crop rotation
4. Compost

Q. Differentiate between manures and fertilizers.

Q. A few tomato seeds were placed in three pots A, B and C containing soil. The pots were watered regularly and following were mixed with the soil in the respective pots.

$\begin{array}{cc}\text{Pot}& \text{Source of Nutrients}\\ \text{Pot A}& \text{Nil}\\ \text{Pot B}& \text{Cow dung}\\ \text{Pot C}& \text{Urea}\end{array}$

Which of the following will be observed after 10 days?

1. Lot of growth in pot A
2. Not much growth in pot B and a lot of growth in pot A
3. Very little growth in pot A but lot of growth in pots B and C
4. Lot of growth in pot B but very little growth in pot C

Q. Which of the following is not an organic manure?

1. Cow dung
2. Fish manure
3. Goat droppings
4. Urea