Fertigation / Chemigation Injection Rate

Total product = the per-acre rate x the acres; injecting it evenly over the irrigation SET means the pump runs at total / set time. Applying 5 gal/acre over 40 acres in a 6-hour set is 200 gal total at 33.3 gph (0.56 gpm). Set the metering pump to that, start after the system reaches pressure and the last emitter flows, then flush with clear water. For a stock solution the resulting concentration is the injection flow / system flow x the stock strength. CRITICAL: an EPA-required anti-siphon/check-valve/interlock package must protect the water source from backflow whenever a chemical is injected. A rate estimate; the product label (FIFRA), the state chemigation rules, and a drawdown calibration govern.

total_product_gal = product_rate_gal_per_acre x area_acres; injection_rate_gph = total_product_gal / set_time_hours; injection_rate_gpm = injection_rate_gph / 60.

Fertigation / chemigation injection-rate practice (EPA chemigation rules; the product label under FIFRA), by name; the label, the state chemigation regulations, and a drawdown calibration govern.

The injection-rate arithmetic is public first-principles (total product over the set time); the per-acre rate, acres, and set time come from the recommendation and the irrigation schedule.

Estimate. AHJ and licensed professional govern.

Field names used by the API: product_rate_gal_per_acre, area_acres, set_time_hours, total_product_gal, injection_rate_gph, injection_rate_gpm

• Injection rate total product = rate (gal/acre) x acres; injection rate = total / set time; stock ppm = (injection flow/system flow) x stock strengthfertigation/chemigation practice
• Backflow protection + calibration an EPA-required anti-siphon/check-valve/interlock package must protect the water source; calibrate against a drawdown check; the FIFRA label and state chemigation rules governEPA chemigation rules / FIFRA