Step 1: Understanding CRI stage.
The Crown Root Initiation (CRI) stage in wheat typically occurs 20–25 days post-sowing.
This stage is pivotal for wheat development as permanent crown roots begin to form.
These roots are crucial for water and nutrient uptake throughout the crop's life.
Step 2: Importance of irrigation at CRI stage.
Insufficient soil moisture during this stage inhibits root development.
Poor root growth leads to reduced tillering, impacting the formation of ear heads.
Therefore, irrigating at the CRI stage promotes robust root establishment, enhanced tillering, and ultimately, increased yield.
Step 3: Analysis of options.
- (A) Rice: Rice requires frequent irrigation during transplanting and later phases; the CRI stage is not applicable.
- (B) Wheat: Wheat's critical first irrigation is at the CRI stage, which is its most vital development phase.
- (C) Maize: Maize has key stages like tasseling and silking; CRI is not relevant.
- (D) Cotton: Cotton's primary irrigation needs are during flowering and boll development.
Step 4: Conclusion.
The crown root initiation stage for irrigation is specific to wheat cultivation.