DJI AGRAS T100 · Application guide
Choose the feeder.
Verify the field rate.
Match your material, plan the required flow and check what reaches the ground.
For T100 spreading, select the feeder by material type, particle size and application rate, then validate both discharged mass and effective swath. The 150 L tank, 100 kg maximum box load and 400 kg/min benchmark describe different limits.
A material that fits through a screw feeder can still deliver the wrong amount per hectare or an uneven pattern. This guide connects feeder selection to flow planning and a material-specific field check, rather than treating the largest published numbers as ready-to-use settings.
For hardware specifications and ordering, see the DJI Agras T100 150L Spreading System. It combines a large hopper, screw-feed discharge and a centrifugal disc; the complete assembly is for the T100. Contact SpeedyDrone to confirm availability and the feeder configuration before ordering.
150 L is volume; 100 kg is a load limit
Hopper volume tells you how much space is available. Loaded mass tells you how heavy the material is. Discharge rate tells you how quickly the system can move material out. None of these values can substitute for another when planning a job.
DJI specifies a 150 L spreading tank and a maximum 100 kg load inside the spreading operation box. The Agras app recommends a loading weight for the aircraft and operating circumstances. Follow that recommendation even when it is below the headline maximum.
A dense product may reach the permitted weight while space remains in the hopper. A light seed may fill the available volume before reaching the permitted mass. DJI identifies low-density grass seed as a reason for the larger tank, but that does not determine which feeder the seed needs.
For planning, keep the material's bulk density and its loaded weight as separate records. Use the actual product or lot being loaded; a volume estimate from a different fertilizer is a poor basis for a seed load. Leave loading, flight and crop decisions within the equipment guidance and applicable material instructions.
Choose a feeder for the material and the rate
Start with three questions: What is the material, what particle-size range does it contain, and how much product must be applied per hectare? A single diameter does not capture a mixed lot, and two products with similar diameters can have different flow behaviour.
The original four feeder sizes remain listed in DJI's specifications and the 150L product-information document. The table adds the equipment application-rate bands shown on DJI's current product page. These bands help screen a setup; they are not fertilizer prescriptions or a guarantee for every material within the diameter range.
On a phone, swipe the table horizontally to view all columns.
| Feeder | Particle size | DJI equipment rate guidance | Material examples and configuration |
|---|---|---|---|
| Extra-Large / XL | 0.5–10 mm | 75–750 kg/ha | Fertilizer, wheat and feed; standard, preinstalled. |
| Medium / M | 4–6 mm | 22.5–120 kg/ha | Rice; standard second feeder. |
| Large / L | 4–10 mm | 75–270 kg/ha | Rice and compatible materials; optional. |
| Small / S | 0.5–4 mm | 3–22.5 kg/ha | Rapeseed, grass seed and compatible small granules; optional. |
Current documentation difference: DJI's product page also lists an optional Medium-Small feeder for 0.5–2 mm particles and 22.5–120 kg/ha, including aquatic feed. The same page retains its “Four Feeder Types” heading, while the specifications, older 150L document and current SpeedyDrone listing show the original four. Confirm the exact accessory, regional compatibility and supply before relying on this additional option; it is not confirmed as part of the standard carton.
Why a 5 mm particle does not automatically mean M
Five millimetres sits within more than one published range. The rate requirement and material type still matter. A feeder chosen only because a particle fits may not be the best starting point for the required throughput.
DJI's discharge qualification identifies particle size, density and surface smoothness as variables. Record those properties where known, alongside the material's condition. Do not copy a saved fertilizer setting to another product simply because the granules look similar.
Grass seed needs its own selection check
Light material makes hopper volume important, but “light” does not mean “use XL.” DJI's current Small-feeder examples include grass seed. The appropriate starting point depends on the actual seed size and intended rate, followed by validation. A blended seed lot needs special attention to its range of particle sizes; one component should not stand in for the whole mixture.
Calculate required flow before discussing 400 kg/min
DJI's 400 kg/min figure is a maximum discharge benchmark measured with compound fertilizer. It describes machine capability under the stated material conditions. Your task's required flow comes from the application rate, the effective working width and ground speed.
Keep units consistent. An application rate in kg/ha is the mass allocated to an area. A flow rate in kg/min is the mass delivered over time. The relationship below follows area throughput; it is a general dimensional calculation, not a DJI-specific formula or an app-setting instruction.
kg/min
kg/ha
metres
metres/second
Illustrative inputs: R = 200 kg/ha, W = 8 m, V = 10 m/s.
The area covered each minute is width × speed × 60. Dividing square metres by 10,000 converts that area to hectares. Multiplying by the target kg/ha gives the required mass per minute during the assumed steady spreading pass.
In this example, the required flow is 96 kg/min. Setting a task to the machine's maximum simply because that maximum exists would disconnect output from the area-based target. A lower target rate, narrower effective width or slower pass requires less flow when the other inputs remain unchanged.
This calculation is also a useful feasibility question: can the selected feeder deliver the required output with the actual material? It does not answer that question by itself. A value below 400 kg/min still needs verification, and the field's safe operating speed must be established independently.
Keep productive-pass arithmetic separate from whole-job productivity. Turning, stopping, loading and other interruptions change elapsed time. They do not justify raising the agronomic rate. Likewise, ensure the rate refers to kilograms of the actual product, rather than kilograms of one nutrient or active ingredient, before using it in a material-flow calculation.
Measure useful swath, not just throw distance
DJI lists an effective spreading width of 3–10 m. Its 10 m measurement uses a 3 m working height, a disc speed of 1100 rpm and a uniformity criterion of CV < 30%. Those conditions belong with the number whenever it is used for planning.
A few particles reaching the outer edge do not establish a usable lane width. What matters is how much material lands across the pattern and how neighbouring passes combine. An acceptable total discharged mass can coexist with too much product near the centre and too little toward the sides.
General spreader-calibration guidance from University of Missouri Extension distinguishes collected output from distribution and effective swath. That principle is useful here, but ground-spreader tray dimensions, overlap rules and machine settings should not be transferred directly to the T100.
Use an appropriate, controlled distribution check for the material and aircraft. Keep collection positions and results identifiable across the pass. The crew needs a way to compare the pattern, not merely a photograph showing that granules reached the field.
Disc speed and height affect the spread pattern. Increasing either to chase a headline width changes the setup being evaluated and calls for another check. Treat the published CV criterion as DJI's test qualification, not as a universal acceptance threshold for every crop or product. Agree on the required field result with the material instructions and qualified application adviser.
Screen the material before loading
The 150L product-information document specifies dry materials with particles from 0.5 to 10 mm. It also requires removing caked fertilizer, bag material, straw, gravel and other foreign objects that can interfere with discharge. “Within the diameter range” is only one part of the check.
| Material | First check | Selection direction |
|---|---|---|
| Compound fertilizer | Actual particle range, condition and required product rate | Compare relevant feeder guidance; calibrate this product. |
| Rice or wheat seed | Size range and intended rate | Use DJI's seed examples as a starting screen, not a universal setting. |
| Grass seed or a seed blend | Smallest/largest particles, volume and rate | Check Small-feeder guidance and the actual mixture; do not default to XL. |
| Aquatic feed | Particle size, required throughput and delivery method | Check the current Medium-Small option with the supplier if relevant. |
| Granular pesticide | Exact registered product, allowed use and current rules | Establish permission separately from mechanical suitability. |
Record moisture condition rather than assuming a dry-looking surface represents the entire bag. Clumps or an inconsistent lot are reasons to stop and reassess suitability, not to force material through the mechanism. Follow the material manufacturer's handling instructions and DJI's hardware guidance; this article does not provide a powered blockage-clearing procedure.
Build a material-specific calibration record
The following is an operator planning framework, not a replacement for DJI's current manual, in-app calibration or qualified training. Perform checks only in a suitable permitted area, with the appropriate crew protection and exclusion arrangements. Recover collection equipment only after the aircraft and discharge mechanism are safely stopped.
- Identify the material. Record product name, lot, particle range, condition and applicable instructions. Confirm that the intended material and use are permissible before planning a field application.
- Document the installed feeder. Check its identity against the actual kit. Record the target kg/ha, planned effective width, disc setting, height and speed. Complete DJI's applicable setup and calibration process for the installed equipment.
- Define a measured steady pass. Mark a known distance and separate the productive spreading segment from acceleration, turning and stopping. Avoid adding unmeasured discharge outside that segment to its result.
- Compare expected and actual mass. Calculate expected mass from rate × treated area. Use suitable measurement and account for material discharged elsewhere or lost during handling; otherwise the comparison is misleading.
- Check lateral distribution. Assess the ground pattern with an appropriate collection method. Evaluate the effective lane spacing and intended pass combination, not just the total mass used.
- Adjust, repeat and save. Make a controlled change, document it and recheck. Save a template only after its material and operating conditions are understood; repeat relevant checks when those conditions change.
A measured-strip cross-check
Using the earlier hypothetical rate of 200 kg/ha and an assumed effective width of 8 m, a 100 m steady spreading segment represents 800 m², or 0.08 ha. Its expected discharge is therefore 16 kg. This is a mass-accounting illustration, not a recommended test-strip size or fertilizer dose.
If the measured result differs, first check the measurement boundary and units. Material used during start-up or after the end marker can make a correct steady-pass rate look wrong. A poorly documented width can also make a discharge result appear correct while the true area application is different.
Record planned mass, measured mass and the method used to obtain each value. Add the distribution result as a separate entry. Do not mark the setup validated solely because one of the two checks looked satisfactory. Set acceptance criteria through the applicable instructions and professional guidance rather than importing an arbitrary percentage from another machine.
Use the weighing sensor without skipping the ground check
DJI describes real-time granular-quantity information, automatic flow calibration and saved operation templates. These functions support material accounting and repeatable setup, but do not show the full ground distribution of a particular field pass.
The practical question is two-part: did the system discharge the intended mass, and did that mass reach the intended area with an acceptable pattern? Hopper information helps with the first question. It cannot alone establish the second.
A saved template should therefore carry context: material and lot, feeder identity, target rate, tested pattern, operating settings and date. When the seed blend, fertilizer condition, delivery method or relevant operating parameters change, treat the previous template as a starting record to review rather than proof that the new task is calibrated.
Disc removal and tank compatibility are separate decisions
DJI's FAQ says the system can discharge with the spreader disc removed, with aquaculture and lotus-field fertilization given as examples. This is a different delivery arrangement from centrifugal broadcast spreading; an established broadcast-swath assumption should not simply be carried into it.
The FAQ also says T70P and T100 spreaders are compatible while their tanks are not. The complete 150L system is specified for the T100. Component-level compatibility does not mean the entire T100 hopper assembly can be fitted to a T70P.
Confirm the exact parts and supported configuration before buying or changing hardware. Follow the current instructions for permitted removal or replacement. The Small feeder has its own optional-kit guidance; this guide does not turn a capability statement into a dismantling tutorial.
For Canada, material fit does not establish permission
DJI's feeder examples include granular pest-control products. That is mechanical equipment guidance, not authorization for a particular Canadian product, crop or application.
Health Canada's June 30, 2026 policy, SPN2026-02, allows RPAS application of products currently registered for conventional aerial application subject to its conditions. Follow the exact registered label and policy requirements, including any RPAS prohibition; do not assume a product permitting only ground use qualifies. Provincial or territorial pesticide requirements remain separate.
Aviation authorization must also match the actual aircraft and operation. DJI specifies a 175 kg maximum takeoff weight for the T100 in spreading configuration, so ordinary small-drone advice is not a sufficient compliance check. No specific chemical, province, licence or flight authorization is approved by this article.
Use the Canadian drone pesticide safety guide for related reading, then check the current official policy and relevant authorities for your intended operation.
Confirm the configuration before ordering
The current DJI AGRAS T100 listing is marked backorder and describes an airframe package with a spraying system, batteries and charging equipment. Its listed package contents do not name the 150L spreading assembly. Confirm the complete invoice configuration instead of assuming the aircraft package includes it.
For a feeder enquiry, bring the material name and particle range, intended kg/ha, existing aircraft configuration and the discharge method you need. Ask which feeder is included, which is optional and whether the precise accessory is supported and available for your regional setup.
For broader platform selection, use the existing T50, T70P and T100 farm-fit comparison. That buying decision is separate from validating a chosen T100 material setup.
Frequently asked questions
Does a 150 L tank mean I can load 150 kg?
No. Litres describe volume, while kilograms describe mass. DJI lists a 100 kg maximum spreading-box load, and the app's recommended loading weight may be lower for the aircraft and conditions. Check the actual loaded mass and follow the recommendation rather than filling to a volume mark and assuming it is safe.
Will every fertilizer flow at 400 kg/min?
No. The maximum benchmark uses compound fertilizer, and DJI qualifies it by particle size, density and surface smoothness. Determine the flow your task requires from the intended area rate, effective swath and ground speed, then verify the actual material. A published maximum cannot replace that check.
Which feeders are standard, and is Medium-Small included?
DJI's standard configuration identifies XL and M. L and S are optional in the original four-size documentation. The current product page additionally lists an optional Medium-Small feeder, but it is absent from the older system document and current store configuration. Confirm the exact accessory and carton contents; do not assume the newer option is included.
Should I use XL for grass seed?
Do not select XL solely because grass seed is light. Volume affects loading, while the feeder decision also depends on particle size and application rate. DJI's current Small-feeder examples include grass seed. Check the actual seed or blend against the relevant guidance and validate both material flow and distribution.
Can I use a 10 m lane spacing for every material?
No. DJI's 10 m width has stated height, disc-speed and uniformity test conditions. Establish the effective swath for the actual setup and assess how adjacent passes combine. The outermost particles do not establish a uniform working width, and a previous material's pattern is not proof for a new one.
Does automatic flow calibration eliminate field checks?
It supports setup, but the intended field result still needs evaluation. Discharge mass and lateral distribution answer different questions. Use material accounting to check how much left the system, and a suitable distribution assessment to check where it landed. Keep both results with the material and operating settings.
Can the system discharge without the spinner disc?
DJI's FAQ confirms that capability and gives aquaculture and lotus-field examples. It does not make a broadcast-spreading template valid for the alternative delivery arrangement. Confirm the supported configuration, follow the current hardware instructions and assess the intended application separately.
Can the complete 150L system fit a T70P?
The 150L product-information document specifies the complete system for T100 only. DJI's separate statement that T70P and T100 spreaders are compatible also says their tanks are not. Confirm the exact component being discussed; compatibility of one part does not establish compatibility of the whole assembly.
What should I send SpeedyDrone for a feeder fit check?
Send the exact material, particle-size range, intended product rate, aircraft configuration and whether you need broadcast spreading or another supported discharge arrangement. A photograph or specification sheet for the material can help identify what still needs verification. Ask for current optional-part availability and written package contents before ordering.
Sources and scope
Manufacturer specifications and equipment guidance checked September 30, 2026. Calculations are illustrative; no SpeedyDrone field trial or crop prescription is represented.
- DJI T100 product page — current feeder guidance, sensor functions and discharge qualifications.
- DJI T100 specifications — load, flow and width test conditions.
- DJI T100 FAQ — feeder selection, disc removal and compatibility.
- DJI 150L Spreading System product information — materials and hardware warnings.
- University of Missouri Extension: spreader calibration — general output and distribution concepts, not T100 settings.
- Health Canada SPN2026-02 — current pesticide RPAS policy.
Discuss your material and feeder setup
Share your material, target rate and existing T100 configuration with SpeedyDrone. Confirm the relevant feeder, complete package contents and current availability before committing to a spreading setup.
Ask SpeedyDrone about your setup
