DRONE DIRECT SEEDING DDS| 40 DAS Close to Panicle Initiation for FINAL TOPDRESSING

Описание: Timing of top dressing at the panicle initiation (PI) stage—when the young panicle is 1–3 mm long—is a critical, high-efficiency moment in rice production. It serves to maximize yield components, specifically the number of spikelets per panicle (grains per panicle), and enhances plant resistance to diseases.

Importance of Timing at Panicle Initiation

Maximizing Panicle Size (Tiller/Spikelet Count): Top dressing at PI increases the number of differentiated spikelets, prevents premature senescence, and boosts dry matter weight. It is crucial for ensuring that the maximum potential number of grains is set.

Preventing Disease: Late application of nitrogen (N) at this stage helps suppress diseases like rice blast by preventing excessive, early canopy growth that would otherwise make the plant more susceptible to infection.

High Nutrient Use Efficiency (NRE): Panicle initiation is the second most efficient time to apply Nitrogen (30%–80% efficiency) because the extensive, near-surface root system rapidly absorbs nutrients to support reproductive growth.

Reducing Lodging: Properly timed nutrients at this stage contribute to a sturdy stem with a high-efficiency vascular bundle, supporting heavy panicles without lodging. 

Optimal Timing and Application Guidelines

When to Apply: The optimal window is typically 5–7 days before panicle initiation (often 45-50 days after transplanting or when the first internode begins to elongate).

How to Identify: PI is determined by slicing a main tiller lengthways to find a small (1–3 mm) white, fuzzy tip above the internode.

Optimal Dosage: Nitrogen applied at this stage often accounts for 20%–30% of the total fertilizer N.

Management Practices: To prevent loss, top dressing should be followed by irrigation to incorporate nutrients into the soil within 3–5 days. 

source: Sciencedirect.com

DRONE DIRECT Seeding
e.g. 112 Days Maturity
Less 65 Days
= 47 Days PI

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