Irrigation is one of the most important factors that determines the growth and yield of wheat. Even if the seed, fertilizer, and soil are good, improper irrigation can reduce tillering, weaken root development, and lower grain yield. For this reason, farmers must pay close attention to the timing of the first irrigation. In wheat, the first irrigation is considered the most critical because it sets the foundation for healthy plant growth.
The ideal time for the first irrigation in wheat is at the Crown Root Initiation (CRI) stage, which usually occurs 20–25 days after sowing. At this stage, the young wheat plant begins forming crown roots at the base. These roots are responsible for absorbing nutrients and water throughout the crop lifecycle. If the soil does not have enough moisture during CRI, root formation becomes weak, and tiller production decreases. This directly affects the number of grains produced later.
The CRI stage is considered the most water-sensitive stage of wheat. Missing or delaying irrigation during this time can cause a permanent yield loss. Even if the farmer irrigates later, the crop cannot compensate fully for the early stress. Therefore, timely irrigation at 20–25 days is essential.
The exact timing may vary slightly depending on soil type and weather. In light sandy soils, moisture is lost quickly, so the first irrigation may be needed earlier, around 18–20 days after sowing. In medium to heavy soils, which retain moisture longer, the first irrigation may be done closer to 22–25 days. Farmers should check moisture by examining the soil with their hand—if the top layer is dry and the lower layer begins to lose firmness, it is time to irrigate.
Proper irrigation at CRI supports tillering, which is the process of producing side shoots. Tillers eventually form additional grain heads. More healthy tillers mean higher yield. When moisture is available during CRI, wheat produces strong, uniform tillers that develop into well-filled ears.
Along with timing, the method of irrigation is also important. Wheat should not be flooded with excessive water. Over-irrigation can lead to diseases, lodging, and nutrient leaching. A light to medium irrigation that wets the root zone evenly is sufficient. If using furrow or border irrigation, water should flow smoothly without stagnation.
After the first irrigation, the next critical stages are jointing, flowering, and grain filling. However, even if later irrigations are slightly delayed, the crop can still adjust. Only the first irrigation cannot be missed or delayed without major impact.
Farmers should also avoid irrigation immediately after applying herbicides. A gap of 2–3 days is recommended unless the particular weedicide requires immediate moisture.
In simple words, the first irrigation in wheat must be done at the Crown Root Initiation stage—around 20–25 days after sowing. This is the most important irrigation of the entire crop cycle. Timely water at this stage helps strong root formation, good tillering, and ultimately ensures a healthy, high-yielding wheat crop.
