DTFGENETICSDREAM THE FUTURE
Teaching
Healthy Cultivation

Course 3 Knowledge check — Fertigation & Root-Zone Verification — Formative Check

Technician II · Course 3 · Knowledge check

Fertigation & Root-Zone Verification — Formative Check

Answer each item before opening its rationale. Use missed items to identify which lesson evidence you should revisit.

Formative learning check: this self-check is for study only and does not create a graded certification record.

1. What is the purpose of meter verification before acting on an unusual batch result?

  1. To confirm the measurement system is fit enough for the decision before changing the process.
  2. To force the reading into the target range.
  3. To replace the original reading in the record.
  4. To eliminate the need for sample identity.
Check answer and rationale

Answer: A. To confirm the measurement system is fit enough for the decision before changing the process.

To confirm the measurement system is fit enough for the decision before changing the process.

2. Why is material identity checked against the batch record?

  1. To estimate plant demand.
  2. To prevent the wrong or incompatible material from entering a controlled batch.
  3. To determine room VPD.
  4. To avoid recording lot information.
Check answer and rationale

Answer: B. To prevent the wrong or incompatible material from entering a controlled batch.

To prevent the wrong or incompatible material from entering a controlled batch.

3. What should happen if required chemical hazard information is unavailable?

  1. Proceed if the container looks familiar.
  2. Use less product and continue.
  3. Pause the task and obtain the required identity/hazard controls before handling proceeds.
  4. Skip PPE for the first step only.
Check answer and rationale

Answer: C. Pause the task and obtain the required identity/hazard controls before handling proceeds.

Pause the task and obtain the required identity/hazard controls before handling proceeds.

4. What is the best evidence that installed emitters are delivering uniformly?

  1. The emitter package rating.
  2. The controller’s programmed duration.
  3. One near-end catch cup.
  4. Representative measured output across relevant positions under operating conditions.
Check answer and rationale

Answer: D. Representative measured output across relevant positions under operating conditions.

Representative measured output across relevant positions under operating conditions.

5. Dryback is best understood as what?

  1. A root-zone moisture trajectory interpreted with crop, media, container and environment context.
  2. A universal percentage for all cannabis crops.
  3. A nutrient concentration target.
  4. A fixed clock interval independent of demand.
Check answer and rationale

Answer: A. A root-zone moisture trajectory interpreted with crop, media, container and environment context.

A root-zone moisture trajectory interpreted with crop, media, container and environment context.

6. Why should a visual symptom not be treated as a confirmed nutrient deficiency?

  1. Leaf color is unrelated to plant health.
  2. Similar symptoms can arise from multiple nutritional, root, irrigation, environmental or biotic causes.
  3. Only laboratory data may ever be used.
  4. Nutrient deficiencies never produce visible symptoms.
Check answer and rationale

Answer: B. Similar symptoms can arise from multiple nutritional, root, irrigation, environmental or biotic causes.

Similar symptoms can arise from multiple nutritional, root, irrigation, environmental or biotic causes.

7. Why preserve an original abnormal reading after later verification finds meter bias?

  1. It should be hidden to avoid confusion.
  2. It should be replaced with the target value.
  3. It is part of the reconstructable history and should be linked to the verification/disposition evidence.
  4. It is irrelevant once the meter is serviced.
Check answer and rationale

Answer: C. It is part of the reconstructable history and should be linked to the verification/disposition evidence.

It is part of the reconstructable history and should be linked to the verification/disposition evidence.

8. A pH/EC sample label is missing. What is the strongest response?

  1. Assume it came from the latest batch.
  2. Use whichever batch result is closest.
  3. Relabel it from memory and continue.
  4. Do not use the result for disposition until sample identity is resolved under procedure.
Check answer and rationale

Answer: D. Do not use the result for disposition until sample identity is resolved under procedure.

Do not use the result for disposition until sample identity is resolved under procedure.

9. What does Technician II diagnostic confidence authorize by itself?

  1. Nothing beyond the worker’s controlled procedure and assigned authority.
  2. Any recipe change that seems scientifically reasonable.
  3. Any chemical substitution with the same EC.
  4. Any equipment repair needed to finish the batch.
Check answer and rationale

Answer: A. Nothing beyond the worker’s controlled procedure and assigned authority.

Nothing beyond the worker’s controlled procedure and assigned authority.

10. A controller run time increased, but catch volume did not. What should the technician infer first?

  1. The plants automatically used more water.
  2. There is a command/delivery mismatch that requires verification of actual system response.
  3. The nutrient recipe is too weak.
  4. The new run time proves delivery increased.
Check answer and rationale

Answer: B. There is a command/delivery mismatch that requires verification of actual system response.

There is a command/delivery mismatch that requires verification of actual system response.

11. What context should accompany root-zone EC trends?

  1. Only cultivar name.
  2. Only target pH.
  3. Irrigation volume/timing, moisture/dryback, stage, environment, media/container and input chemistry.
  4. Only the last feeding event.
Check answer and rationale

Answer: C. Irrigation volume/timing, moisture/dryback, stage, environment, media/container and input chemistry.

Irrigation volume/timing, moisture/dryback, stage, environment, media/container and input chemistry.

12. What should a next-shift handoff include when the root-zone cause remains unresolved?

  1. Only the leading hypothesis.
  2. A rewritten record showing one clear cause.
  3. No uncertainty so the next shift is not confused.
  4. Current evidence, ranked possibilities, checks completed, current safe/controlled status and the next verification needed.
Check answer and rationale

Answer: D. Current evidence, ranked possibilities, checks completed, current safe/controlled status and the next verification needed.

Current evidence, ranked possibilities, checks completed, current safe/controlled status and the next verification needed.