The undesirable plants may grow naturally along with the crop are called weeds. There are many ways to remove weeds and control their growth. Weeds can be removed by uprooting or cutting them close to the ground, from time to time. This is done with the help of a khurpi. Weeds are also controlled byRead more
The undesirable plants may grow naturally along with the crop are called weeds. There are many ways to remove weeds and control their growth. Weeds can be removed by uprooting or cutting them close to the ground, from time to time. This is done with the help of a khurpi.
Weeds are also controlled by using certain chemicals, called weedicides, like 2, 4–D. These are sprayed in the fields to kill the weeds.
Soil supplies mineral nutrients to the crop. These nutrients are essential for the growth of plants. Continuous growing of crops in the same field makes the soil poorer in certain nutrients. This makes the soil infertile. And then, to replenish the soil with nutrients farmers need to add manures toRead more
Soil supplies mineral nutrients to the crop. These nutrients are essential for the growth of plants. Continuous growing of crops in the same field makes the soil poorer in certain nutrients. This makes the soil infertile. And then, to replenish the soil with nutrients farmers need to add manures to the soil.
Wheat is a rabi crop, hence it requires cold climatic conditions to be grown properly. If it is sown in the kharif season, it will not grow or may get destroyed due to excessive rains in the kharif season. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
Wheat is a rabi crop, hence it requires cold climatic conditions to be grown properly. If it is sown in the kharif season, it will not grow or may get destroyed due to excessive rains in the kharif season.
The supply of water to crops at different intervals is called irrigation. The two methods of irrigation which conserve water are as follows: (i) Sprinkler System: Under this method, the perpendicular pipes, having rotating nozzles on top, are joined to the main pipeline at regular intervals. When waRead more
The supply of water to crops at different intervals is called irrigation. The two methods of irrigation which conserve water are as follows:
(i) Sprinkler System:
Under this method, the 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 escapes from the rotating nozzles. It gets sprinkled on the crop as if it is raining.
(ii) Drip system:
In this system, the water falls drop by drop just at the position of the roots. It is the best technique for watering fruit plants, gardens and trees. Water is not wasted at all. It is a boon in regions where availability of water is poor.
The main Differences between Fertiliser and Manure are as follows: Fetilisers: 1. A fertiliser is an inorganic salt. 2. A fertiliser is prepared in factories. 3. A fertiliser does not provide any humus to the soil. 4. Fertilisers are very rich in plant nutrients like nitrogen, phosphorus and potassiRead more
The main Differences between Fertiliser and Manure are as follows:
Fetilisers:
1. A fertiliser is an inorganic salt.
2. A fertiliser is prepared in factories.
3. A fertiliser does not provide any humus to the soil.
4. Fertilisers are very rich in plant nutrients like nitrogen, phosphorus and potassium.
Manures:
1.Manure is a natural substance obtained by the decomposition of cattle dung, human waste and plant residues.
2.Manure can be prepared in the fields.
3.Manure provides a lot of humus to the soil.
4.Manure is relatively less rich in plant nutrients.
What are weeds? How can we control them?
The undesirable plants may grow naturally along with the crop are called weeds. There are many ways to remove weeds and control their growth. Weeds can be removed by uprooting or cutting them close to the ground, from time to time. This is done with the help of a khurpi. Weeds are also controlled byRead more
The undesirable plants may grow naturally along with the crop are called weeds. There are many ways to remove weeds and control their growth. Weeds can be removed by uprooting or cutting them close to the ground, from time to time. This is done with the help of a khurpi.
Weeds are also controlled by using certain chemicals, called weedicides, like 2, 4–D. These are sprayed in the fields to kill the weeds.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
See lessExplain how soil gets affected by the continuous plantation of crops in a field.
Soil supplies mineral nutrients to the crop. These nutrients are essential for the growth of plants. Continuous growing of crops in the same field makes the soil poorer in certain nutrients. This makes the soil infertile. And then, to replenish the soil with nutrients farmers need to add manures toRead more
Soil supplies mineral nutrients to the crop. These nutrients are essential for the growth of plants. Continuous growing of crops in the same field makes the soil poorer in certain nutrients. This makes the soil infertile. And then, to replenish the soil with nutrients farmers need to add manures to the soil.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
See lessIf wheat is sown in the kharif season, what would happen? Discuss.
Wheat is a rabi crop, hence it requires cold climatic conditions to be grown properly. If it is sown in the kharif season, it will not grow or may get destroyed due to excessive rains in the kharif season. https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
Wheat is a rabi crop, hence it requires cold climatic conditions to be grown properly. If it is sown in the kharif season, it will not grow or may get destroyed due to excessive rains in the kharif season.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
See lessWhat is irrigation? Describe two methods of irrigation which conserve water.
The supply of water to crops at different intervals is called irrigation. The two methods of irrigation which conserve water are as follows: (i) Sprinkler System: Under this method, the perpendicular pipes, having rotating nozzles on top, are joined to the main pipeline at regular intervals. When waRead more
The supply of water to crops at different intervals is called irrigation. The two methods of irrigation which conserve water are as follows:
(i) Sprinkler System:
Under this method, the 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 escapes from the rotating nozzles. It gets sprinkled on the crop as if it is raining.
(ii) Drip system:
In this system, the water falls drop by drop just at the position of the roots. It is the best technique for watering fruit plants, gardens and trees. Water is not wasted at all. It is a boon in regions where availability of water is poor.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
See lessExplain how fertilisers are different from manure.
The main Differences between Fertiliser and Manure are as follows: Fetilisers: 1. A fertiliser is an inorganic salt. 2. A fertiliser is prepared in factories. 3. A fertiliser does not provide any humus to the soil. 4. Fertilisers are very rich in plant nutrients like nitrogen, phosphorus and potassiRead more
The main Differences between Fertiliser and Manure are as follows:
Fetilisers:
1. A fertiliser is an inorganic salt.
2. A fertiliser is prepared in factories.
3. A fertiliser does not provide any humus to the soil.
4. Fertilisers are very rich in plant nutrients like nitrogen, phosphorus and potassium.
Manures:
1.Manure is a natural substance obtained by the decomposition of cattle dung, human waste and plant residues.
2.Manure can be prepared in the fields.
3.Manure provides a lot of humus to the soil.
4.Manure is relatively less rich in plant nutrients.
https://www.tiwariacademy.com/ncert-solutions/class-8/science/chapter-1/
See less