Question

Identify the most critical stage of wheat when irrigation is required

• A. Tillering stage
• B. Booting stage
• C. Flowering stage
• D. Crown root initiation stage

Hint:

Always remember: "CRI stage" (at around 21 days after sowing) is the primary irrigation window for wheat. Water stress at this stage permanently stunts root growth and tillering, causing the highest possible yield reduction.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Critical crop growth stages for irrigation are those developmental phases where water stress causes the most severe, irreversible yield losses.
Wheat has six key growth stages, each with varying sensitivity to water deficits.

Step 2: Detailed Explanation:
The growth stages of wheat in chronological order are:
1. Crown Root Initiation (CRI) stage ($20 - 25$ days after sowing)
2. Tillering stage ($40 - 45$ days after sowing)
3. Late jointing stage ($60 - 65$ days after sowing)
4. Flowering stage ($80 - 85$ days after sowing)
5. Milk stage ($100 - 105$ days after sowing)
6. Dough stage ($115 - 120$ days after sowing)
Among these, the Crown Root Initiation (CRI) stage is the absolute most critical stage.
At this stage, the plant transitions from relying on seminal roots to establishing its permanent crown root system, which supports the plant's tillering and nutrient uptake.
Water stress at the CRI stage restricts root development, severely reducing the number of productive tillers and overall grain yield.
If water is limited and only one irrigation is available, it must be applied at the CRI stage.

Step 3: Final Answer:
The Crown Root Initiation (CRI) stage is the most critical stage for wheat irrigation, corresponding to option (D).