Class 9 Science Improvement in Food Resources Notes with PDF | NCERT Science Notes - Monelitho

Improvement in Food Resources

⬇ Jump to Download

Food is one of the most basic requirements for life, yet the challenge is not only to produce enough food, but also to produce it in a way that is nutritious, economical, sustainable, and suitable for a growing population. As the human population increases, the demand for cereals, pulses, vegetables, milk, eggs, fish, meat, and other food products also increases. At the same time, natural resources such as land, water, and soil fertility are limited. That is why improving food resources is an essential part of agriculture and animal husbandry. This topic explains how science helps us increase food production through better crop varieties, improved farming practices, crop protection, and better care of animals and fish.

Improvement in food resources is not just about producing more food. It is also about producing better food, reducing losses, maintaining soil health, protecting plants from pests and diseases, and ensuring that animals are healthy and productive. In this chapter, two major areas are studied in detail: crop production and management and animal husbandry.

Need for Improving Food Resources

The world population is continuously increasing, and with it comes greater pressure on agriculture. Traditional farming methods alone are not enough to meet modern food demands. A large portion of farmland depends on rain, soil quality, climate, and availability of water. In many places, farmers also face problems like pest attacks, plant diseases, shortage of fodder, poor quality seeds, and low animal productivity.

Improvement in food resources is needed for several reasons:

• To increase yield from the same area of land.
• To improve the quality and nutritional value of food.
• To make crops resistant to diseases, pests, drought, and salinity.
• To reduce losses during storage and transport.
• To support sustainable agriculture and protect the environment.
• To improve the productivity of cattle, poultry, fish, and bees.

A strong food system depends on both crop farming and animal rearing. Crops provide grains, vegetables, fruits, fodder, and oilseeds. Animals provide milk, eggs, meat, fish, wool, honey, and other products. Together, they support human nutrition and the economy.

Crop Production and Management

Crop production means growing plants on a large scale for food, fodder, fibre, and other useful products. Different crops are grown in different seasons and in different soil and climatic conditions. Crop production is not just the act of sowing seeds; it involves a complete series of activities such as soil preparation, sowing, adding manure and fertilisers, irrigation, weed control, harvesting, storage, and protection from pests.

1. Crop Variety Improvement

One of the most effective ways to improve food production is to develop improved crop varieties. A crop variety is a group of plants within the same species that has specific useful characteristics. Scientists and farmers choose or develop varieties that perform better than traditional ones. This can be done through plant breeding, selection, hybridisation, and genetic improvement.

The main objectives of crop variety improvement are:

• Higher yield: Producing more crop from the same land.
• Improved quality: Better taste, higher nutritional value, better cooking quality, or more oil/protein.
• Resistance to biotic factors: Protection against insects, fungi, bacteria, and viruses.
• Resistance to abiotic factors: Ability to survive drought, flood, salinity, heat, cold, and frost.
• Short maturity duration: Faster growth and harvesting, which allows more than one crop in a year.
• Wider adaptability: Ability to grow in different regions and environmental conditions.
• Desirable agronomic traits: Tallness in fodder crops and dwarfness in cereals to prevent lodging.

Crop improvement often uses two important methods. The first is selection, where plants with desirable traits are chosen and grown further. The second is hybridisation, where two different plants are crossed to combine useful characteristics in one offspring. For example, one parent may have high yield while another may have disease resistance. Their offspring may inherit both advantages.

Important idea: Improved crop varieties do not automatically solve all problems. They must be matched with good soil management, proper irrigation, fertilisation, and pest control. A high-yielding seed will not produce good results if the field is poorly managed.

2. Crop Production Management

Crop production management refers to the scientific methods used to grow crops efficiently. It includes the use of modern techniques that improve soil fertility, save water, and promote healthy plant growth. The three key components are nutrient management, irrigation, and cropping patterns.

A. Nutrient Management

Plants require nutrients for growth, flowering, fruiting, seed formation, and overall development. These nutrients are obtained mainly from the soil. If crops are grown continuously without replacing nutrients, the soil becomes less fertile. Nutrient management is the practice of supplying plants with required nutrients at the right time and in the right amount.

Plant nutrients are broadly classified into:

• Macronutrients: Needed in large amounts, such as nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur.
• Micronutrients: Needed in small amounts, such as iron, manganese, copper, zinc, boron, molybdenum, and chlorine.

The major sources of nutrients are manure and fertilisers. Manure is decomposed plant and animal waste. It improves soil structure, adds organic matter, and increases water-holding capacity. Fertilisers are commercially produced chemical substances rich in specific nutrients. They act quickly and provide nutrients in concentrated form.

The difference between manure and fertiliser is important:

• Manure is natural, bulky, and slow-acting.
• Fertilisers are chemical, concentrated, and fast-acting.
• Manure improves soil health in the long run.
• Excessive use of fertilisers may harm soil, water, and microorganisms.

Manure can be of several types:

• Compost: Decomposed plant and animal waste.
• Vermicompost: Compost made using earthworms.
• Green manure: Young green plants such as sunn hemp or guar are grown and ploughed into the soil to add nitrogen and organic matter.

Fertilisers are helpful, but their use should be balanced. Excess fertiliser can cause soil and water pollution. It may also reduce beneficial soil organisms. Therefore, a balanced combination of organic manures and fertilisers is best for sustainable farming.

B. Irrigation

Irrigation is the artificial supply of water to crops at regular intervals. Water is necessary for seed germination, nutrient absorption, photosynthesis, and transport of materials in the plant. Since rainfall is often irregular and insufficient, irrigation becomes essential in many places.

The timing and amount of irrigation depend on the crop, soil type, season, and stage of plant growth. For example, crops may need more water during flowering and grain formation. Sandy soils need more frequent irrigation than clayey soils because they retain less water.

Traditional irrigation methods include:

• Moat: Water is lifted manually using a pulley system.
• Chain pump: Water is drawn using a chain mechanism.
• Dhekli: A lever system used to lift water.
• Rahat: A device driven by animals to lift water from wells.

Modern irrigation methods are more efficient and help save water:

• Sprinkler system: Water is sprayed like rain, useful for uneven land and sandy soil.
• Drip irrigation: Water is delivered drop by drop directly to the root zone. It is highly efficient and especially useful in water-scarce areas.

Efficient irrigation is important because water is a limited resource. Over-irrigation can lead to waterlogging, root damage, and loss of soil nutrients. Proper irrigation management increases crop yield and reduces wastage.

C. Cropping Patterns

Cropping patterns describe the ways crops are grown on farmland throughout the year. They are designed to use land, water, and nutrients efficiently while reducing risk. The three main cropping patterns are mixed cropping, intercropping, and crop rotation.

• Mixed cropping: Two or more crops are grown together in the same field at the same time. This reduces the risk of total crop failure if one crop is damaged.
• Intercropping: Two or more crops are grown in a definite row pattern. This helps in better use of nutrients, water, and sunlight. It also reduces pest spread.
• Crop rotation: Different crops are grown on the same field in a planned sequence. This helps maintain soil fertility and break pest cycles.

A common example of crop rotation is growing a cereal crop followed by a legume crop. Leguminous plants have nitrogen-fixing bacteria in their root nodules. These bacteria convert atmospheric nitrogen into a usable form for plants, improving soil fertility naturally.

Crop rotation is very useful because it:

• Prevents exhaustion of soil nutrients.
• Helps control weeds, pests, and diseases.
• Improves yield in the long run.
• Supports sustainable agriculture.

3. Crop Protection Management

Crops face many dangers during growth and storage. These include weeds, insect pests, plant diseases, birds, rodents, fungi, bacteria, and viruses. Crop protection management refers to all the techniques used to protect crops from these harmful agents.

Weeds are unwanted plants that grow along with crops. They compete for water, nutrients, space, and sunlight. Some weeds grow faster than crops and reduce productivity. Therefore, removing weeds is very important. Weed control can be done by manual removal, ploughing, tilling, using mulches, or applying weedicides.

Pest control is another important part of crop protection. Insects such as aphids, stem borers, and locusts can damage leaves, stems, roots, flowers, and grains. Pesticides and insecticides are chemical agents used to kill or control pests, but they must be used carefully. Excessive or incorrect use can harm humans, animals, beneficial insects, and the environment.

Plant diseases may be caused by fungi, bacteria, or viruses. They can spread through air, water, insects, soil, and infected seeds. Disease-resistant varieties, clean seeds, proper field sanitation, and safe use of protective chemicals can reduce disease losses.

Crop protection also includes proper storage. After harvesting, grains must be dried thoroughly before storage. Moisture in stored grains encourages fungus, insects, and rotting. Good storage practices include clean containers, dry warehouses, pest-proof bins, and regular inspection.

Why crop protection matters: Even if a crop grows well in the field, large losses can happen after harvest if grains are not stored properly. So food security depends on both production and preservation.

Cropping Seasons

In India, crops are commonly classified according to seasons into Kharif and Rabi crops. This classification depends mainly on climate and rainfall patterns.

• Kharif crops: Grown during the rainy season, usually sown with the beginning of monsoon and harvested in autumn. Examples: rice, maize, soybean, cotton, groundnut, and millet.
• Rabi crops: Grown during the winter season, usually sown after the rains and harvested in spring. Examples: wheat, gram, pea, mustard, and barley.

Some areas also grow crops in a third season called zaid, which falls between rabi and kharif. This is possible in regions with irrigation and suitable climate.

Storage of Grains

Proper storage is a crucial part of food management. If grains are stored with too much moisture, they can become infected by fungi and bacteria. Insects may also multiply quickly in such conditions. Rodents can damage large quantities of food. Storage losses can be reduced by drying, cleaning, treating grains, and storing them in moisture-free, pest-free warehouses.

Small-scale farmers often store grains in gunny bags, bins, or metallic containers. Large-scale storage is done in silos and granaries. Modern storage structures use scientific methods to maintain temperature, humidity, and pest control.

Animal Husbandry

Animal husbandry is the scientific management of domestic animals for food and other useful products. It includes breeding, feeding, shelter, disease control, and proper care of animals. It is an important source of milk, eggs, meat, wool, honey, leather, and fish. Good animal husbandry increases productivity and ensures the health of livestock.

The main branches of animal husbandry include cattle farming, poultry farming, fish production, and bee-keeping. All of these are economically important and support rural livelihoods.

1. Cattle Farming

Cattle are reared for milk, draught power, and manure. In many parts of India, cattle are an integral part of farming. They help in ploughing fields, transporting goods, and providing organic manure. Cattle include cows and buffaloes.

Good cattle management involves:

• Proper feeding: Animals need balanced food containing roughage, concentrates, proteins, minerals, vitamins, and clean water.
• Good shelter: Cattle sheds should be clean, well ventilated, dry, and protected from heat, rain, and cold.
• Breed improvement: Good breeds produce more milk and are more resistant to disease.
• Disease control: Regular vaccination, cleanliness, and veterinary care reduce losses.

Feed for cattle is of two main types:

• Roughage: Fibrous feed such as hay, straw, and green fodder.
• Concentrates: Nutrient-rich feed such as cereals, oil cakes, and pulses.

Milk production depends on the breed, nutrition, housing, and health of the animal. Cross-breeding is often used to combine high milk yield with local adaptability and disease resistance.

2. Poultry Farming

Poultry farming is the rearing of birds such as hens, ducks, turkeys, and geese for eggs and meat. It is one of the fastest ways to increase animal protein production because poultry birds grow quickly, reproduce fast, and require relatively less space.

Poultry breeds are selected for:

• High egg production.
• Rapid growth for meat.
• Resistance to disease.
• Ability to adapt to local climate.

Poultry management requires:

• Proper housing with ventilation and cleanliness.
• Balanced feed rich in proteins, minerals, and vitamins.
• Protection from cold, heat, and predators.
• Vaccination and control of infections.

Poultry diseases can spread quickly in crowded conditions, so hygiene is extremely important. Eggs and meat are rich sources of protein, and poultry farming helps meet the nutrition needs of people at a low cost.

3. Fish Production

Fish is an important source of food, especially because it contains high-quality protein, healthy fats, vitamins, and minerals. Fish production is called fisheries. It includes both catching fish from natural water bodies and rearing fish in controlled environments.

There are two main types of fisheries:

• Marine fisheries: Fish and other aquatic organisms are obtained from seas and oceans.
• Inland fisheries: Fish are obtained from rivers, ponds, lakes, reservoirs, canals, and tanks.

Fish farming in ponds, tanks, and reservoirs is called aquaculture. When fish are reared in ponds in a scientific manner, it is called pisciculture. Fish farming can be very productive if proper species, food, water quality, and breeding methods are used.

Fish culture may involve:

• Composite fish culture: Different fish species are grown together in one pond, each using different food resources and water zones.
• Rearing both local and exotic species: This improves output when species are selected carefully.

A major challenge in fish production is maintaining water quality. Oxygen level, temperature, pH, and cleanliness of water influence the growth of fish. Overcrowding, pollution, and disease can reduce production.

4. Bee-Keeping

Bee-keeping or apiculture is the rearing of honeybees for honey, wax, and other products. It is a valuable agro-based activity because bees not only produce honey but also help in pollination. Pollination improves fruit and seed formation in many crops.

Good bee-keeping requires:

• Suitable species of bees.
• Availability of nectar and pollen-rich flowers.
• Clean and safe hives.
• Protection from diseases and pests.
• Proper handling during honey extraction.

Bee-keeping is profitable because it requires low investment and provides multiple products. Honey is nutritious and wax is used in medicines, cosmetics, candles, and polishing materials. Bee-keeping also supports crop productivity through pollination.

Sustainable Food Production

Sustainable food production means producing food in such a way that the needs of the present are met without harming the ability of future generations to meet their needs. It balances productivity with environmental care. Overuse of chemicals, water wastage, soil erosion, and loss of biodiversity can reduce long-term productivity. Therefore, modern agriculture must focus on sustainability.

Some important sustainable practices are:

• Using organic manure along with fertilisers.
• Practising crop rotation and intercropping.
• Using drip and sprinkler irrigation to save water.
• Preventing soil erosion by maintaining plant cover.
• Reducing chemical misuse and adopting integrated pest management.
• Improving animal health through better housing and feeding.

Sustainable farming is not only about yield. It also aims at soil conservation, water conservation, pollution reduction, and better livelihoods for farmers.

Integrated View of Food Resources

The improvement of food resources should be understood as a complete system. Crops, animals, fish, and bees are all connected. Crop residues can be used as fodder. Animal manure can enrich the soil. Bees help in pollination. Fish provide food and income. When managed scientifically, all these components support each other and create a more efficient agricultural system.

This integrated approach is especially important in a country like India, where farming is done on a large scale by small and marginal farmers. Scientific methods can increase income, reduce losses, and improve food availability across the country.

Key Terms to Remember

• Crop variety improvement: Developing better crop types with useful traits.
• Manure: Decomposed plant and animal waste used to improve soil.
• Fertiliser: Chemical substance supplying nutrients to plants.
• Irrigation: Artificial supply of water to crops.
• Mixed cropping: Growing two or more crops together.
• Intercropping: Growing crops in a planned row pattern.
• Crop rotation: Growing different crops in a sequence on the same field.
• Weed: Unwanted plant growing with crops.
• Pesticide: Chemical used to control pests.
• Animal husbandry: Scientific management of domestic animals.
• Aquaculture: Fish farming in controlled water bodies.
• Apiculture: Bee-keeping.

Exam-Oriented Understanding

When writing answers from this topic, it is important to explain not only the definition but also the reason and importance. For example, if asked about manure, mention that it adds organic matter, improves soil texture, and supports microorganisms. If asked about drip irrigation, explain that it saves water by delivering it directly to the roots. If asked about crop rotation, mention that it maintains soil fertility and helps control pests.

A good answer in science should show cause and effect. For instance:

• Improved seeds give higher yield because they are bred for better traits.
• Balanced fertilisation increases growth because plants receive required nutrients.
• Proper storage reduces losses because it prevents insect attack and fungal growth.
• Healthy livestock produce more milk, eggs, or meat because their nutrition and living conditions are better.

Class 9 Science Improvement in Food Resources Notes PDF

📄 Download PDF

Final Summary of the Topic

Improvement in Food Resources is a broad and practical topic that combines crop science and animal management. It explains how science helps farmers and food producers increase productivity while protecting the environment. Better crop varieties, proper nutrient management, efficient irrigation, and crop protection help produce more and better crops. At the same time, animal husbandry, poultry farming, fish production, and bee-keeping expand the supply of milk, eggs, meat, fish, honey, and wax. Together, these practices improve food security, support rural economies, and make agriculture more sustainable.

The central idea of the chapter is clear: food production must be intelligent, scientific, and responsible. It is not enough to grow more food; we must grow it in ways that conserve soil, water, biodiversity, and animal health. When farming is managed properly, it can support both human needs and the natural environment. That is why improvement in food resources remains one of the most important goals in science and agriculture.