Which of the following is incorrect statement for hydroponics

Options

A. role of individual elements has been largely determined
B. usually, a small volume of nutrient solution is required for hydroponic culture
C. concentration of nutrients is adjusted frequently to prevent changes in nutrient concentration and pH of the medium.
D. Vigorous bubbling of the air through the medium is also routinely done to provide sufficient oxygen

Explanation

To determine which statement about hydroponics is incorrect, we need to analyze the given statements one by one. Here’s a step-by-step breakdown:

### Step 1: Understand Hydroponics
Hydroponics is a method of growing plants without soil, using a nutrient-rich water solution instead. This is the fundamental concept of hydroponics.

**Hint:** Remember that hydroponics relies on nutrient solutions rather than soil.

### Step 2: Evaluate the Statements
1. **Statement 1:** Hydroponics is the soil-less growth of plants in a nutrient solution.
- This statement is correct as it accurately defines hydroponics.

2. **Statement 2:** A large volume of nutrient solution is required for hydroponic culture.
- This statement is incorrect. Hydroponics typically requires a small volume of nutrient solution because the system is designed to recirculate the solution efficiently.

3. **Statement 3:** The concentration of the nutrients is adjusted frequently to prevent changes in the nutrient levels.
- This statement is correct. In hydroponics, maintaining the right nutrient concentration is crucial for plant health.

4. **Statement 4:** Vigorous bubbling of air through the medium is routinely done to provide sufficient oxygen.
- This statement is correct. Aeration is important in hydroponics to ensure that plant roots receive enough oxygen.

### Step 3: Identify the Incorrect Statement
From the evaluation, we see that Statement 2 is the incorrect one. Hydroponics does not require a large volume of nutrient solution; rather, it can function effectively with a smaller volume due to the recirculation of nutrients.

**Final Answer:** The incorrect statement for hydroponics is: "A large volume of nutrient solution is required for hydroponic culture."