Chapter Notes - Crop Production and Management Class 8 Notes | EduRev

Science Class 8

Class 8 : Chapter Notes - Crop Production and Management Class 8 Notes | EduRev

The document Chapter Notes - Crop Production and Management Class 8 Notes | EduRev is a part of the Class 8 Course Science Class 8.
All you need of Class 8 at this link: Class 8

What is a Crop?

Plants of the same kind that are grown and cultivated as a source of food in a large cultivable land is called a crop.

Chapter Notes - Crop Production and Management Class 8 Notes | EduRevWheat Crop

Agricultural Practices

People in the past ate raw fruits and vegetables and started hunting animals for food. Later, they could cultivate land and produce rice, wheat and other food crops. Thus, was born ‘Agriculture’. 
  • When the same kinds of plants are grown at one place on a large scale, it is called a 'Crop'
  • Different types of crops like cereals, vegetables and fruits etc., can be classified on the basis of the season in which they grow. Chapter Notes - Crop Production and Management Class 8 Notes | EduRev
  • India is a vast country. Here climatic conditions like temperature, humidity and rainfall vary from one region to another. There is a rich variety of crops grown in different parts of India. 

Despite this diversity, two broad cropping patterns can be identified:

1. Kharif Crops: Plants that are planted during the rainy season are called Kharif crops. The rainy season in India is generally from June to September. Paddy, maize, soybean, groundnut, cotton, etc., are examples of Kharif crops.
Examples: 

Chapter Notes - Crop Production and Management Class 8 Notes | EduRevKharif Crops2. Rabi Crops: Crops that are grown in the winter season are called rabi crops. Their time period is generally from October to March. Wheat, gram, pea, mustard and linseed are examples of rabi crops.
Examples:

Chapter Notes - Crop Production and Management Class 8 Notes | EduRevRabi Crops

Try yourself:Which of the following is not an example of kharif crop?
View Solution


Basic Practices of Crop Production 

The several activities undertaken by the farmers for the cultivation of crops over a period of time are referred to as agricultural practices.

1. Preparation of Soil

  • One of the most important tasks in agriculture is to turn the soil and loosen it. The top layer of soil supports plant growth and is rich in nutrients. 
  • The loose soil allows the roots to penetrate and breathe easily, even when they go deep into the soil. The loosened soil helps in the growth of earthworms and microbes present in the soil.Chapter Notes - Crop Production and Management Class 8 Notes | EduRev
  • The process of loosening and turning the soil is called tilling or plowing. This is done by using a plow that is made of wood or iron.
  • If the soil is very dry, it may need watering before plowing. The plowed field may have big pieces of soil called crumbs. It is necessary to break these crumbs with a plank. The field is levelled by a leveller for sowing as well as for irrigation purposes. 

Agricultural Implements

Plough:

A plough is a device that is used by farmers for different purposes such as adding fertilizers, tilling, and loosening the soil.

Chapter Notes - Crop Production and Management Class 8 Notes | EduRev

  • It is also used for adding fertilizers to the soil, removing weeds, scraping of soil, etc.
  • The ploughshare is the triangular iron strip.
  • A plough shaft is the main part of the plough, which is made using a log of wood.
  • The other end of the shaft has a handle.
  • The other end is attached to a beam that is placed on the bull’s necks.
  • A wooden, traditional plough can be operated by a pair of an ox and a man.
  • Nowadays these wooden ploughs are being replaced by iron ploughs.

Hoe:

A hoe is a tool that is used to dig up soil to remove weeds and also loosen up the soil before planting a sapling.

Cultivator:

A cultivator is attached to the tractor and helps in loosening soil.

Cultivators are used instead of ploughs since they are faster.


Try yourself:The process of loosening of the soil is called
View Solution


2. Sowing

Sowing is the most important part of crop production. Before sowing, good-quality seeds are selected. These are clean and healthy seeds of a good variety.

Farmers prefer to use seeds that give a high yield.

Before sowing, one of the important tasks is to know about the tools used for sowing seeds:

(a) Traditional Tool: It is the tool-shaped liked funnel used traditionally for sowing seeds. The seeds are filled into the funnel, passed down through two or three pipes having sharp ends. These ends pierce into the soil and place seeds there. 

Chapter Notes - Crop Production and Management Class 8 Notes | EduRevTraditional Tool


(b) Seed Drill: Nowadays, the seed drill is used for sowing with the help of tractors. With the help of this tool sows the seeds uniformly at proper distances and depths. It ensures that seeds get covered by the soil after sowing and prevents damage caused by birds. It saves time and labor. 

Chapter Notes - Crop Production and Management Class 8 Notes | EduRevSeed Drill


Point to Remember:

How to separate damaged seeds from healthy seeds?

  • Put the seeds in water. Damaged seeds are hollow and lighter and thus, float on water. Good and healthy seeds sink in water and settle down.

While sowing seeds, it is essential to make sure that:
(a) Seeds are healthy and of high quality.
(b) They are planted at the correct distance from each other so that they can get proper light, water, and nutrients from the soil.
(c) They must be sown deep enough to protect them from animals and birds (which might eat them) and wind (which might blow them away) but not so deep that they may not get enough air to germinate. 

3. Adding Manure and Fertilizers

When crop after the crop is grown in the same field, the soil becomes poor in certain nutrients. 

  • Manure and fertilizers are added to the soil to replenish it with nutrients to ensure the healthy growth of plants. Fertilizers are chemicals used to add minerals like potassium, phosphorus and nitrates to the soil. 

Manure can be of various types such as:
(a) Natural Organic Manure
This includes raw manure, compost, and green manure:
(i) Raw manure is a mixture of cattle and domestic waste.
(ii) Compost is well-rotted plant and animal residue.
(iii) Green Manure are crops grown in the field as the pure crop or as an intercrop between the main crops and then, buried in the field to enrich the soil.

Chapter Notes - Crop Production and Management Class 8 Notes | EduRevOrganic Manure


(b) Biofertilizers: These are the nitrogen-fixing organisms that are widely used in organic farming and make agriculture sustainable. These include Rhizobium, Azotobacter, blue-green algae. 

(c) Vermi-Compost: It is a type of compost that is made using earthworms.

Chapter Notes - Crop Production and Management Class 8 Notes | EduRevVermi-Compost


Three methods of replenishing the soil with nutrients are:
(i) Adding organic manure to the soil.
(ii) Adding chemical fertilizers to the soil.
(iii) Leaving the field uncultivated (or fallow) between two crops and Crop rotation, in which different crops are grown alternately to allow the soil to replenish with different nutrients. 

Pros and Cons of using Fertilizers
Pros: They are chemicals, rich in particular nutrients and help farmers get a better yield of crops like wheat, paddy and maize.
Cons: They make the soil less fertile and also cause water pollution. 


Ques. Why is Manure better than Fertilizers?
Ans. Organic Manure is better than Fertilizers because:

  • It adds humus to the soil and increases its water holding capacity.
  • Improves soil texture.
  • Makes soil porous which makes the exchange of gases easier.
  • Increases the number of friendly microbes.

Table: Difference between Manure and Fertilizers:

Chapter Notes - Crop Production and Management Class 8 Notes | EduRev


4. Irrigation

Water is important for the proper growth and development of plants.

  • Water is essential because the germination of seeds does not take place under dry conditions. Nutrients dissolved in the water get transported to each part of the plant.
  • Water also protects the crop from both frost and hot air currents. The supply of water to crops at different intervals is called irrigation.
  • It’s not a good idea to depend on rain for water as it is not fully reliable. A proper irrigation system will ensure timely and adequate water for crops. This will lead to more yield. 

Sources of Irrigation: Wells, Tube wells, Ponds, Lakes, Rivers, Dams, and Canals.

Chapter Notes - Crop Production and Management Class 8 Notes | EduRevTube Well

Traditional Methods of Irrigation

The water available in wells, lakes, and canals is lifted up by different methods in different regions, for taking it to the fields. Here various traditional methods are: 

Chapter Notes - Crop Production and Management Class 8 Notes | EduRevChapter Notes - Crop Production and Management Class 8 Notes | EduRev

Modern Methods of Irrigation

  • Sprinkler System: In this system, perpendicular pipes, having rotating nozzles on top, are joined to the main pipeline at regular intervals. When water is allowed to flow through the main pipe under pressure with the help of a pump, it sprinkles from the rotating nozzles. It gets sprinkled on the crop as if it is raining. 

Chapter Notes - Crop Production and Management Class 8 Notes | EduRev

  • Drip system: In this system, the water falls drop by drop just at the position of the roots. So it is called the drip system.

Chapter Notes - Crop Production and Management Class 8 Notes | EduRev


Try yourself:In today’s world, where water is a scarce resource, which among the following irrigation methods is most feasible and sustainable?
View Solution


5. Protection from Weeds

  • Weeds are undesirable plants that may grow naturally along with the crop in the field.
  • The removal of weeds is called weeding. Weeding is necessary because they affect the growth of the crop by competing with the crop plants for water, nutrients, space and light. 

Weed Control 

  • Farmers use many ways to remove weeds and control their growth. Tilling before sowing of crops helps in uprooting and killing of weeds, which may then dry up and get mixed with the soil. Chapter Notes - Crop Production and Management Class 8 Notes | EduRev
    Removal of Weeds
  • The best time for the removal of weeds is before they produce flowers and seeds. The manual removal includes the physical removal of weeds by uprooting or cutting them close to the ground, from time to time with the help of a khurpi
  • Weeds are also controlled by spraying certain chemicals called weedicides, in the fields to kill the weeds. They do not damage the crops. 

6. Harvesting

  • Cutting the crop after it has ripened and gathered the grains is known as harvesting. We can use the word crop ripened rather than using the word crop mature. 
  • A sickle has a sharp serrated-edged metal blade attached to a wooden handle. A sickle is used for cutting the crop. A harvester is a machine that helps to cut the ripened crop from the fields. Chapter Notes - Crop Production and Management Class 8 Notes | EduRev
  • Threshing is the process of separating the grains from the straw and chaff. A thresher is used for threshing. 
  • A combine is a combination of a thresher and a harvester. 
  • Winnowing is a process in which we allow natural wind to blow through the grains, so the lighter substances fly away, whereas the heavier grains fall to the ground. The fan in a winnowing machine blows away the chaff.Chapter Notes - Crop Production and Management Class 8 Notes | EduRev
    Winnowing

Try yourself:The process of separation of grain from the chaff after harvesting is known as
View Solution


7. Storage

Precautions to be taken during storage of food grains are:

  • Grains should be dried properly, or they might rot easily.
  • They should be stored in completely dry gunny bags.
  • The bags should be kept in a place that is completely moisture-free.
  • Storage areas should be well-ventilated.
  • In larger godowns, care should be taken that chemicals used to repel or kill insects and rats do not contaminate food grains.  

Ques. How are grains protected from pests, bacteria, and fungi?

  • Grains (seeds) are dried in the sun to reduce their moisture.
  • On small scale, grains are stored in jute bags or metallic bins.
  • On large scale, they are kept in silos and granaries.
  • Dried neem leaves are used at home to protect food grains.
  • In big godowns, chemical treatments are done to protect the large quantities of grain.

Granaries

  • Granaries are the place where freshly obtained food grains are stored. Chapter Notes - Crop Production and Management Class 8 Notes | EduRev

8. Food from Animals

  • Animal husbandry is the management and care of farm animals for milk, egg, or meat.Chapter Notes - Crop Production and Management Class 8 Notes | EduRev
    Animal Husbandry
  • Animal husbandry has been practised for thousands of years since the first domestication of animals. 
  • Humans are dependent on animals in innumerable ways. The animals are domesticated by humans for many purposes.

Frequently Asked Questions

Q.1. What do you mean by the term crop? Explain briefly the types of crops. 

Ans: Crop is the term used to describe a plant that is grown in a field on a large scale. For example, cereal crops, pulses, and fruit crops.

  • The crops grown in India can be classified as kharif and rabi.
  • Kharif crops are sown in the rainy season by June/July and are harvested by September/October. 
  • Thus, they are also known as summer season crops. For example, rice, maize, etc.
  • Rabi crops are sown in the winter season in October or November and are harvested by March/April. Thus, they are also called winter season crops. For example, mustard, wheat, potato, etc.

Q.2. What is irrigation? Name the two main methods of irrigation and define them briefly.

Ans: The artificial method of watering the plants for assisting in the growth of the plants is called irrigation. The two main methods of irrigation are:

  • Traditional method: The traditional method of irrigation is very less expensive and they often lead to wastage of water. The traditional method of irrigation involves a chain pump, dhekli, moat (the pulley system), and rahat (lever system).
  • Modern method: Modern methods of irrigation are more inclined towards the use of diesel, bio¬gas, solar energy, and electricity for lifting water.
  • The two most important modern systems of irrigation are: Sprinkler irrigation system & Drip irrigation system

Q.3. Write a short note on the terms:

Ans: 

  • Storage: Storage of produce is an important task. If the crop grains are to be kept for a longer time, they should be safe from moisture, insects, rats, and microorganisms. Before storing, the grains are properly dried in the sun to reduce the moisture in them. This prevents the attack by insect pests, bacteria, and fungi. Grains are stored by farmers in jute bags or metallic bins. However, large-scale storage of grains is done in silos and granaries to protect them from pests like rats and insects.
  • Harvesting: After the maturation of crop, harvesting is an important task. In harvesting, crops are pulled out or cut close to the ground. It usually takes 3 to 4 months for a cereal crop to mature. Harvesting in our country is either done manually by sickle or by a machine called harvester.
Offer running on EduRev: Apply code STAYHOME200 to get INR 200 off on our premium plan EduRev Infinity!

Related Searches

video lectures

,

Extra Questions

,

Important questions

,

practice quizzes

,

Semester Notes

,

Objective type Questions

,

MCQs

,

shortcuts and tricks

,

Summary

,

study material

,

Chapter Notes - Crop Production and Management Class 8 Notes | EduRev

,

Viva Questions

,

Previous Year Questions with Solutions

,

Sample Paper

,

Chapter Notes - Crop Production and Management Class 8 Notes | EduRev

,

past year papers

,

mock tests for examination

,

ppt

,

pdf

,

Chapter Notes - Crop Production and Management Class 8 Notes | EduRev

,

Free

,

Exam

;