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Cultivation practices refer to the series of carefully planned and executed agricultural operations that prepare the land, sow the seeds, maintain crop growth, and finally harvest the produce. These practices aim to maximize crop yield, conserve soil health, optimize resource use, and ensure sustainable farming. Applying correct cultivation methods is crucial, especially for competitive agriculture, where efficient time, cost management - often measured in Indian Rupees (INR) - and effective use of water and nutrients make a big difference.
In this chapter, you will learn about fundamental cultivation steps backed by precise metric measurements such as seed rate in kilograms per hectare (kg/ha), irrigation water in cubic meters (m³), and fertilizer doses in kg/ha. Understanding these parameters helps you plan farming operations scientifically and answer exam questions confidently.
Land preparation is the first essential step in growing any crop. It involves readying the field physically and chemically for optimal seed germination and growth. Well-prepared soil improves aeration, moisture retention, nutrient availability, and root penetration.
Tillage means the mechanical turning and breaking of soil to make it suitable for planting. There are two main types:
Soil testing is the chemical analysis of soil samples to determine nutrient content (like nitrogen, phosphorus, potassium) and pH levels. This guides farmers in applying the right kind and amount of fertilizers, avoiding under- or over-fertilization which can reduce yield or cause environmental harm.
Field levelling is the process of making the farm surface nearly flat or uniformly sloped. Correct levelling reduces water runoff, prevents waterlogging, and ensures uniform irrigation. Methods include laser levelling for precision and traditional levelling using levelling boards or water tubes.
graph TD A[Field Clearing] B[Primary Tillage (Ploughing)] C[Secondary Tillage (Harrowing)] D[Field Levelling] A --> B B --> C C --> D
Seed quality and planting significantly influence crop success. Seed treatment and proper sowing ensure healthy seeds and uniform germination.
Seed treatment is the practice of treating seeds before sowing to protect them from diseases and pests. Common methods include:
Seeding rate is the quantity of seed required to sow one hectare. It varies by crop type and seed size. For example, wheat may require 100 kg/ha, while paddy may need 40 kg/ha. Using the correct seeding rate avoids overcrowding or sparse planting, both of which reduce yield.
Choosing the right sowing method depends on crop, land type, and availability of labor and machinery. The main methods are:
Irrigation means supplying water to crops artificially when rainfall is inadequate. Efficient irrigation avoids water wastage and ensures crop water requirements are met for optimal yield.
The Crop Water Requirement (CWR) is the total water the crop consumes via evapotranspiration during its growing period, measured in millimeters (mm). To irrigate a field, volume of water needed is:
Irrigation scheduling is deciding when and how often to irrigate based on crop growth stage, soil moisture, and weather. Over-irrigation wastes water and causes nutrient leaching, while under-irrigation stresses plants and reduces yield.
| Method | Efficiency (%) | Approximate Cost (INR/ha) | Water Use (litres/ha) | Suitability |
|---|---|---|---|---|
| Surface | 40 - 60 | 5,000 - 10,000 | 6,000,000 | Flat land, low-cost setup |
| Sprinkler | 70 - 85 | 25,000 - 40,000 | 4,000,000 | Uneven terrain, light soils |
| Drip | 90 - 95 | 40,000 - 70,000 | 2,000,000 | Water-scarce areas, orchards |
Step 1: Identify the seed rate and field area.
Seed rate = 100 kg/ha
Area = 2 ha
Step 2: Use the formula:
\[ \text{Seed Required} = 100 \times 2 = 200 \text{ kg} \]
Answer: 200 kilograms of wheat seed are required to sow 2 hectares.
Step 1: Convert area to square meters.
1 hectare = 10,000 m²
Step 2: Apply the irrigation water requirement formula:
\[ \text{IWR} = 500 \text{ mm} \times 10,000 \text{ m}^2 \times 10^{-3} \]
Note: 1 mm = 0.001 meters, so multiplying by \(10^{-3}\) converts mm·m² to m³.
\[ = 500 \times 10,000 \times 0.001 = 5,000 \text{ m}^3 \]
Answer: 5,000 cubic meters of water are needed to irrigate the field.
Step 1: Find total fertilizer amount:
\[ \text{Dose} = 100 \text{ kg/ha} \times 3 \text{ ha} = 300 \text{ kg} \]
Step 2: Calculate cost:
\[ \text{Cost} = 300 \times 25 = 7,500 \text{ INR} \]
Answer: The total cost for fertilizer application is Rs.7,500.
Step 1: Understand the parameters:
Step 2: Calculate days between irrigations:
\[ \text{Irrigation interval} = \frac{\text{Soil moisture depletion}}{\text{Daily ETc}} = \frac{50}{6} \approx 8.3 \text{ days} \]
Answer: Irrigation should be scheduled every 8 days to prevent crop water stress.
Step 1: Understand crop roles:
Step 2: Design rotation pattern for 3 seasons:
Step 3: Apply on 3 hectares with one hectare per crop, rotating the crops among fields next year.
Answer: This rotation improves soil nitrogen, reduces pest build-up, and sustains yield over multiple seasons.
When to use: Quickly estimate seed needs during exams without calculations
When to use: Converting crop water requirements into irrigation volume in metric units
When to use: Solving fertilizer cost questions where partial formula application causes errors
When to use: Multiple-choice questions comparing irrigation methods on efficiency and cost
When to use: Applied questions on sustainable crop planning
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