Question

Arrange in sequence, the following critical stages for irrigation in wheat cultivation according to the order of their importance.
(A). F – Flowering
(B). LT – Late tillering
(C). M – Milk
(D). CRI – Crown root initiation
Choose the correct answer from the options given below:

• A. (A), (D), (C), (B).
• B. (A), (C), (B), (D).
• C. (B), (A), (D), (C).
• D. (D), (B), (A), (C).

Hint:

Crown Root Initiation (CRI) is always the first and most critical stage of irrigation in wheat, starting around 21 days after sowing. Knowing that CRI (D) is first instantly points to Option (D).

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Certain growth stages of crops are highly sensitive to moisture stress.
In wheat, the sequence of growth stages dictates the scheduling of irrigation to prevent severe yield penalties.

Step 2: Detailed Explanation:
The critical growth stages of wheat, listed chronologically as they occur in the field, are:

• Crown Root Initiation (CRI) stage: Occurs around 21 days after sowing (DAS). This is the most critical stage where crown roots begin to form. Water stress here causes severe tillering issues. (D)

• Late Tillering (LT) stage: Occurs around 40-45 DAS, where active tillers develop. (B)

• Jointing stage: Occurs around 60-65 DAS.

• Flowering (F) stage: Occurs around 80-85 DAS, when spikelets emerge and pollination happens. (A)

• Milk (M) stage: Occurs around 100-105 DAS, where grain filling begins. (C)

• Dough stage: Occurs around 115-120 DAS.
Arranging the given options chronologically according to their sequence of occurrence gives:
CRI (D) \(\rightarrow\) Late tillering (B) \(\rightarrow\) Flowering (A) \(\rightarrow\) Milk (C).
This matches the sequence given in Option (D).

Step 3: Final Answer
The correct chronological sequence is (D), (B), (A), (C).