What are the advantages of fertigation in agriculture ? 1. Controlling the alkalinity of irrigation water is possible. 2 Efficient application of Rock Phosphate and all other phosphatic fertilizers is possible. 3. Increased availability of nutrients to plants is possible. 4. Reduction in the leaching of chemical nutrients is possible. Select the correct answer using the code given below:
(c) 1,3 and 4 only
Understanding Fertigation and its Advantages
Fertigation is a technique that combines fertilization and irrigation, applying dissolved fertilizers to the soil along with the irrigation water. This method delivers nutrients directly to the plant's root zone, allowing for precise and timely nutrient application.
Analyzing the Advantages of Fertigation
Let's examine each statement provided regarding the advantages of fertigation in agriculture:
- Controlling the alkalinity of irrigation water is possible. This statement is correct. Fertigation allows for the addition of acidic fertilizers (like urea phosphate or phosphoric acid) or other pH adjusters directly into the irrigation water. This helps in neutralizing bicarbonates, preventing scale formation in the irrigation system, and maintaining a favorable pH in the root zone, which improves nutrient availability.
- Efficient application of Rock Phosphate and all other phosphatic fertilizers is possible. This statement is incorrect. Rock phosphate and many conventional phosphatic fertilizers (like Single Super Phosphate - SSP) are largely insoluble in water. Fertigation systems require fertilizers to be fully soluble to prevent clogging emitters and filters. While some highly soluble phosphorus fertilizers (like monoammonium phosphate - MAP or monopotassium phosphate - MKP) are suitable for fertigation, insoluble forms like rock phosphate cannot be applied efficiently or safely through this method.
- Increased availability of nutrients to plants is possible. This statement is correct. By applying soluble nutrients directly to the active root zone through irrigation, plants can access them readily as they take up water. Nutrients are delivered uniformly across the irrigated area, ensuring that plants receive the required elements precisely when and where they need them for uptake, leading to increased nutrient availability and uptake efficiency.
- Reduction in the leaching of chemical nutrients is possible. This statement is correct. Fertigation allows for the application of nutrients in smaller, more frequent doses that match the plant's uptake rate throughout its growth cycle. This 'spoon-feeding' approach minimizes the amount of excess nutrients in the soil at any given time, significantly reducing the risk of mobile nutrients (like nitrates) being leached below the root zone, especially in sandy soils or areas with high rainfall/irrigation.
Summarizing the Statements
| Statement No. | Statement | Validity as an Advantage of Fertigation |
|---|---|---|
| 1 | Controlling the alkalinity of irrigation water is possible. | Correct |
| 2 | Efficient application of Rock Phosphate and all other phosphatic fertilizers is possible. | Incorrect |
| 3 | Increased availability of nutrients to plants is possible. | Correct |
| 4 | Reduction in the leaching of chemical nutrients is possible. | Correct |
Based on the analysis, statements 1, 3, and 4 are valid advantages of fertigation. Statement 2 is not correct because rock phosphate and many other phosphatic fertilizers are not suitable for efficient application through fertigation due to their low solubility.
Conclusion on Fertigation Advantages
The advantages of fertigation include better control over water pH, improved nutrient availability to plants, and reduced nutrient leaching. These benefits contribute to more efficient resource use and potentially higher crop yields.
Revision Table: Key Aspects of Fertigation
| Aspect | Description |
|---|---|
| Definition | Applying fertilizers dissolved in irrigation water. |
| Suitable Fertilizers | Highly soluble fertilizers (e.g., Urea, Ammonium Nitrate, MAP, MKP, Potassium Chloride). |
| Unsuitable Fertilizers | Insoluble or sparingly soluble fertilizers (e.g., Rock Phosphate, SSP). |
| Application Timing | Nutrients can be applied frequently as needed by the crop. |
Additional Information on Fertigation
Fertigation is widely used in various irrigation methods, including drip irrigation, sprinkler irrigation, and pivot irrigation. It offers several benefits over traditional fertilization methods:
- Precise nutrient placement directly in the root zone.
- Uniform nutrient distribution across the field or irrigation zone.
- Flexibility in adjusting nutrient types and concentrations according to plant growth stage and specific needs.
- Reduced nutrient losses through volatilization (for some nitrogen fertilizers when surface applied) or fixation in the soil.
- Potential for reduced labor costs compared to manual fertilizer application.
- Integration with irrigation scheduling allows for optimal water and nutrient delivery simultaneously.
However, fertigation also requires careful management, including using high-quality, soluble fertilizers, proper maintenance of the injection equipment, and understanding crop nutrient requirements to avoid over- or under-application.
Important Questions from Current Affairs
Consider the following minerals:
1. Bentonite
2. Chromite
3. Kyanite
4. Sillimanite
In India, which of the above is/are officially designated as major minerals?
With reference to Ocean Mean Temperature (OMT), which of the following statements is/are correct?
1. OMT is measured up to a depth of 26°C isotherm which is 129 meters in the south-western Indian Ocean during January - March
2. OMT collected during January - March can be used in assessing whether the amount of rainfall in monsoon will be less or more than a certain long-term mean.
Select the correct answer using the code given below:
With reference to chemical fertilizers in India, consider the following statements :
1. At present, the retail price of chemical fertilizers is market-driven and not administered by the Government.
2. Ammonia, which is an input of urea, is produced from natural gas.
3. Sulphur, which is a raw material for phosphoric acid fertilizer, is a by-product of oil refineries.
Which of the statements given above is/are correct?
With reference to India's Desert National Park, which of the following statements are correct?
1. It is spread over two districts.
2. There is no human habitation inside the Park
3. It is one of the natural habitats of Great Indian Bustard.
Select the correct answer using the code given below:
Siachen Glacier is situated to the
