Sumitomo TopGrain is a specialised plant growth regulator and grain-filling technology developed for paddy and wheat. It is powered by S-Abscisic Acid 8.3% and is designed to support the crop's natural grain-filling process during the important reproductive stage.
TopGrain works at the physiological level by supporting sugar movement from leaves to developing grains, mobilisation of stored energy and starch formation inside the grain. When applied at the correct crop stage, it helps support more uniform grain development, grain weight and crop quality.
| Product Name | TopGrain |
|---|---|
| Brand | Sumitomo |
| Company | Sumitomo Chemical India Ltd. |
| Product Type | Plant Growth Regulator / Grain Filling Technology |
| Active Ingredient | S-Abscisic Acid 8.3% |
| Recommended Crops | Paddy and Wheat |
| Primary Use | Grain Filling, Grain Weight, Uniformity and Quality Support |
| Application Method | Foliar Spray |
| Recommended Dose | 25 g per acre |
| Active Ingredient | S-Abscisic Acid |
|---|---|
| Concentration | 8.3% |
| Product Category | Plant Growth Regulator |
| Primary Physiological Role | Supports Grain Filling and Assimilate Movement |
| Process | Role in Grain Development |
|---|---|
| Translocation | Supports movement of sugars from leaves toward developing grains. |
| Mobilisation | Helps mobilise stored energy from the stem toward grain development. |
| Biosynthesis | Supports starch formation inside developing grains. |
| Uniformity | Supports more uniform grain filling across the panicle or ear head. |
| Crop | Dose | Recommended Spray Timing |
|---|---|---|
| Paddy / Rice | 25 g per acre | 50% Heading Stage |
| Wheat | 25 g per acre | Early Grain Filling Stage |
For paddy, Sumitomo recommends TopGrain at 25 g per acre during the 50% heading stage. This is the stage when approximately half of the primary panicles have emerged from the boot.
Application at the correct heading stage is important because this period marks the transition toward active grain development and subsequent grain filling.
For wheat, Sumitomo recommends TopGrain at 25 g per acre during the early grain-filling stage.
The recommended stage is when kernels are at the watery-ripe to early-milk stage, approximately 7–10 days after anthesis. Correct timing helps position the application during active grain development.
| Additive | Recommended Rate |
|---|---|
| Non-Ionic Surfactant | 0.5 ml per litre of spray water |
Sumitomo recommends adding a compatible non-ionic surfactant at 0.5 ml per litre of water during TopGrain spray preparation. Follow the manufacturer's mixing sequence and compatibility instructions for best application performance.
During grain filling, carbohydrates produced by photosynthesis must be transported efficiently from leaves and other plant tissues toward developing grains. TopGrain is designed to support this physiological process so that available assimilates can be utilised more effectively during grain development.
Proper grain filling can support grain weight, size and uniformity when the crop also receives adequate nutrition, water and other agronomic inputs.
TopGrain supports the transfer and utilisation of crop assimilates during the grain-development stage. Sumitomo states that this can help reduce partially filled, shrivelled and immature grains while supporting bolder and heavier grain formation.
Actual crop response will depend on variety, weather, irrigation, nutrient availability and overall crop health.
Uniform and well-filled grains are important for produce quality and marketability. Sumitomo states that TopGrain supports grain size, grain weight, test weight and more uniform grain development.
In paddy, uniform grain development may also support milling-related quality characteristics under suitable crop-management conditions.
TopGrain is a specialised plant growth regulator and grain-filling technology from Sumitomo Chemical India developed for paddy and wheat.
TopGrain is powered by S-Abscisic Acid 8.3%.
Sumitomo officially recommends TopGrain for paddy and wheat.
The recommended dose is 25 g per acre for both paddy and wheat.
Apply at the 50% heading stage, when approximately half of the primary panicles have emerged from the boot.
Apply during early grain filling when kernels are at the watery-ripe or early-milk stage, approximately 7–10 days after anthesis.
It supports sugar translocation from leaves, mobilisation of stored energy and starch biosynthesis inside developing grains.
Sumitomo states that TopGrain supports enhanced grain filling and helps reduce chaffy and partially filled grains.
Yes. Sumitomo states that TopGrain supports grain filling, grain size and grain weight when used at the recommended crop stage.
Yes. Sumitomo recommends a compatible non-ionic surfactant at 0.5 ml per litre of spray water.
No. TopGrain supports physiological grain-filling processes and should be used alongside balanced crop nutrition, irrigation and proper agronomic management.
Yes. Sumitomo specifically recommends the 50% heading stage in paddy and early grain filling in wheat, so correct application timing is important.
Sumitomo TopGrain with S-Abscisic Acid 8.3% is a specialised grain-filling technology designed to support sugar translocation, energy mobilisation, starch formation and uniform grain development in paddy and wheat. Correct stage-specific application can help support grain weight, size and quality when combined with good crop nutrition and field management.
Disclaimer: The details provided are for informational guidance only. Always adhere to the recommended application instructions as stated on the product label and in the accompanying leaflet.
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