Correct Option (c)
Explanation
Fertigation is an agricultural technique where fertilizers are applied along with irrigation water, typically through drip or sprinkler systems. This method offers several advantages:
- Statement 1: Controlling the alkalinity of irrigation water is possible. Fertigation systems allow for the precise introduction of pH-adjusting agents (e.g., acids) into the irrigation water. This helps in managing the pH and alkalinity of the water, which can optimize nutrient availability for plants and prevent scaling in the irrigation system.
- Statement 3: Increased availability of nutrients to plants is possible. By delivering dissolved nutrients directly to the active root zone, fertigation ensures that plants have immediate access to the required elements. This targeted delivery enhances nutrient uptake efficiency compared to traditional broadcasting methods.
- Statement 4: Reduction in the leaching of chemical nutrients is possible. The controlled and precise application of nutrients through fertigation minimizes over-application. This reduces the potential for nutrients, particularly highly soluble ones like nitrates, to leach below the root zone and contaminate groundwater.
Incorrect Options
- Statement 2: Efficient application of Rock Phosphate and all other phosphate fertilizers is possible. This statement is incorrect. Rock phosphate and many other phosphate fertilizers have low solubility in water. Their application through fertigation systems can lead to precipitation, which can clog emitters and pipes, making them unsuitable for efficient fertigation. Only highly soluble phosphate fertilizers are generally used in fertigation.
- Options (a), (b), and (d) are incorrect because they include statement 2, which inaccurately claims the suitability of rock phosphate and all other phosphate fertilizers for efficient fertigation.