Crop Production and Management — NCERT Solutions, AI Tutor & Practice

Understand: When plants of the same kind are grown and cultivated at one place on a large scale, it is called a crop.

Analyze: Crops are grouped by growing season:

• Kharif crops – sown in the rainy season (June to September). Example: paddy (rice), maize, cotton.
• Rabi crops – grown in the winter season (October to March). Example: wheat, gram, mustard.

Conclude: A crop is a large-scale cultivation of one kind of plant. Example of a kharif crop: paddy; example of a rabi crop: wheat.

Understand: Growing a crop involves a fixed sequence of tasks called agricultural practices.

Analyze: The practices, in order, are:

1. Preparation of soil (ploughing, levelling)
2. Sowing of seeds
3. Adding manure and fertilisers
4. Irrigation (watering)
5. Protection from weeds (weeding)
6. Harvesting
7. Storage

Conclude: These seven steps, done in sequence, make up complete crop production and management.

Understand: Ploughing loosens and turns the top layer of soil.

Analyze: Loosening the soil helps because:

• It allows air to reach deep into the soil, and roots need oxygen to breathe (respiration).
• Loose soil lets roots penetrate and grow easily.
• It brings nutrient-rich soil from below to the top.
• It helps in the growth of earthworms and microbes that add humus.
• Loose soil holds moisture and retains water better.

Conclude: Ploughing improves aeration, root growth and soil fertility, so it is essential before sowing.

Understand: A seed drill is a tool/machine used to sow seeds, usually attached to a tractor.

Analyze: Advantages over traditional broadcasting (scattering by hand):

• It sows seeds at equal distances and proper depth.
• Seeds get covered by soil after sowing, protecting them from birds.
• It saves time and labour.
• Even spacing prevents overcrowding and competition for water, nutrients and sunlight.

Conclude: A seed drill ensures uniform, correctly-spaced sowing, giving healthier plants than random hand sowing.

Understand: Both manure and fertiliser add nutrients to soil, but they differ in nature and effect.

Analyze:

| Manure | Fertiliser | |--------|-----------| | Natural substance from decomposition of plant/animal waste | Man-made chemical rich in a particular nutrient | | Provides less nutrients per amount | Very rich in nutrients (N, P, K) | | Adds humus and improves soil texture | Does not add humus | | Environment-friendly | Excess use harms soil and pollutes water |

Conclude: Manure is a natural, humus-adding organic material, while fertiliser is a nutrient-rich chemical that must be used carefully.

Understand: Crop rotation is the practice of growing different crops in the same field in alternate seasons or years, one after another.

Analyze:

• If we grow a leguminous crop (like gram, pulses) in one season, its root nodules contain Rhizobium bacteria that fix atmospheric nitrogen in the soil.
• The next crop (like wheat) then uses this replenished nitrogen.
• This reduces the need for nitrogen fertilisers and prevents soil from becoming barren.

Conclude: By alternating nutrient-demanding crops with nitrogen-fixing legumes, crop rotation naturally restores soil fertility.

Understand: Irrigation is the supply of water to crops at regular intervals for their growth.

Analyze: Two modern (water-saving) methods:

1. Sprinkler system: Water is sprayed like rain through nozzles on rotating pipes. Useful for uneven land and sandy soil.
2. Drip system: Water falls drop by drop directly at the roots through narrow tubes. It saves the maximum water and is ideal for regions with water scarcity.

Conclude: Irrigation provides needed water; sprinkler and drip systems deliver it efficiently, reducing wastage.

Understand: Weeds are the unwanted plants that grow naturally along with the crop.

Analyze: Weeds are harmful because they compete with the crop for water, nutrients, space and sunlight, reducing yield.

Methods of removal (weeding):

1. Manual/mechanical removal: Pulling out weeds by hand or removing them with tools like a khurpi or seed drill before they flower and produce seeds.
2. Using weedicides: Spraying chemicals such as 2,4-D that kill weeds but do not harm the crop.

Conclude: Weeds are unwanted competing plants, removed by manual weeding or by spraying weedicides.

Understand: Harvesting is the cutting and gathering of a mature crop from the field.

Analyze:

• Harvesting can be done manually with a sickle or by a machine called a harvester.
• After harvesting, the grain seeds must be separated from the chaff (dried stalk/husk). This process is called threshing.
• A machine called a combine performs both harvesting and threshing together.
• Threshing done by wind to separate lighter chaff from heavier grain is called winnowing.

Conclude: Harvesting is cutting the ripe crop; a combine harvests and threshes, while winnowing separates grain from chaff using wind.

Understand: After harvesting, grains must be stored for future use and sale, so storage must protect them from spoilage.

Analyze: Grains can be spoiled by:

• Moisture – causes fungus/mould growth
• Insects, rats and micro-organisms – eat and contaminate grains

Precautions taken:

• Grains are dried in the sun to remove moisture before storing.
• Stored in airtight containers, jute bags, or silos and granaries.
• Neem leaves (at home) or chemical treatment and fumigation (in large godowns) protect grains from pests.

Conclude: Proper drying and pest-proof, moisture-free storage prevent grain loss and keep grains fit for use.

Understand: Crop production is linked to animals both as food source and through farming of animals.

Analyze:

• Crops and their by-products (fodder like hay, straw and grains) serve as food for animals.
• Rearing animals on a large scale for food (milk, eggs, meat) is called animal husbandry.
• Example: A dairy farm rears cattle, and these cows are fed on fodder crops such as berseem and grain husk obtained from crop production.

Conclude: Animals depend on crops for fodder, and rearing them for food — animal husbandry — is closely connected to crop production.

Understand: High yield depends on doing each agricultural practice correctly.

Analyze: Four recommended practices with reasons:

1. Select good quality, healthy seeds – healthy seeds (that sink in water) germinate well and give strong plants.
2. Proper irrigation using the sprinkler/drip method – paddy needs plenty of water; efficient methods supply water while preventing wastage.
3. Add manure along with balanced fertilisers – manure adds humus and fertilisers supply nutrients like nitrogen for growth, keeping soil fertile.
4. Timely weeding and pest control – removing weeds and pests prevents competition and damage, protecting yield.

Conclude: Good seeds, correct irrigation, balanced nutrients and proper weeding/pest control together ensure a healthy, high-yield paddy crop.