# John Deere See & Spray: independent university trials cut post-emergence herbicide 43–62%

> Computer-vision targeted spraying, measured not by John Deere but by independent university weed scientists: a peer-reviewed Weed Technology study reports 28.4–62.4% post-emergence herbicide savings, a University of Arkansas 3-year trial reports 43–59%, and an independent Iowa State field study reports 76% average product savings — with an honestly documented resistant-weed tradeoff at low sensitivity settings.

- Verification status: pending
- Case type: deployment
- Provider: John Deere (See & Spray)
- Client: Independent university field trials — University of Arkansas & Iowa State University, Agriculture / row-crop (soybean) production (named)
- Sector: agriculture / US / ops
- Canonical URL: https://theinternetninja.com/stories/john-deere-see-spray-ai-spot-spraying-cuts-herbicide-use-43-59-independently-con/
- Source: The Internet Ninja (theinternetninja.com), independent verified-proof platform

## Outcomes

| Metric | Before | After |
| --- | --- | --- |
| Post-emergence herbicide savings vs. broadcast (peer-reviewed Weed Technology 2024, Avent/Norsworthy et al.) | Broadcast application | 28.4%–62.4% saved |
| Herbicide use reduction vs. broadcast (University of Arkansas 3-year trial, March 2025) | Broadcast application | 43–59% reduction |
| Average product savings (Iowa State field study, 5 fields, 415 acres) | Broadcast application | 76% average savings; $15.7/acre; ~4,700 gallons saved |

## Verification method

Headline outcome rests on independent academic measurement (peer-reviewed Weed Technology paper + independent Iowa State field study). Checker independently re-verified all three primary figures verbatim against LIVE pages (Cambridge/Weed Technology 28.4-62.4%, authors Avent/Norsworthy et al.; University of Arkansas 43-59%; Iowa State 76% avg, authors Houser/Darr/Huffman), plus local sources/ captures; mechanical quotecheck.py passes 9/9; deterministic score 1.000. All four Wayback snapshots resolve HTTP 200 (Cambridge 20260616083457, aaes 20250401020827, Iowa State 20260619062000, WSSA 20251014221754). Green awaits only a recorded confirmation from the Arkansas (Norsworthy/Avent) or Iowa State (Houser/Darr) researchers that the figures, windows and sensitivity settings are represented correctly - human-only, no agent sets verified.

## Full case file

## The problem
Broadcast spraying applies post-emergence herbicide across an entire field regardless of
where weeds actually are. That wastes product, raises grower cost, and — with herbicide-
resistant weeds like Palmer amaranth spreading — keeps chemical pressure high across ground
that has no weeds on it at all.

## What was built
John Deere's **See & Spray** is a computer-vision targeted-spraying system. Cameras and
on-board processors on the sprayer boom detect green weeds against soil and residue in real
time and fire **only the nozzles over a weed**, instead of broadcasting herbicide across the
whole field. The version measured in the Iowa State study is the **See & Spray Ultimate**.

What makes this story verifiable is *who measured it*: not John Deere's marketing, but
**independent university weed-science programs**.

## The outcome
Every figure below is quoted verbatim from an independent source fetched this session; each
number is attributed to its own source and none are merged.

- **Peer-reviewed (University of Arkansas), *Weed Technology* 2024** — Avent, Norsworthy et al.,
  two years at Keiser, AR and Greenville, MS: *"On average, targeted sprays saved a range of
  28.4% to 62.4% on postemergence herbicides."*
- **University of Arkansas 3-year trial (March 2025)** — *"43-59 percent reduction in herbicide
  use compared to broadcast applications."* Modeled Arkansas grower savings of **13–80%**, or
  **$1.6 million to $48 million per year** on post-emergence herbicide expenditures.
- **Iowa State University field-scale study (Aug 2024)** — five soybean fields, 415 acres:
  *"Average product savings across all fields was 76% and had an economic savings of nearly
  $6,500 ($15.7/ac) from reduced herbicide use"* (per-field range 43.9%–90.6%).

### The honest tradeoff (shown, not merged away)
The same University of Arkansas trial found a real, setting-dependent risk. At a **low
sensitivity setting** — where only larger weeds get sprayed to maximize short-term savings —
missed small Palmer amaranth let the pigweed population **increase 280% each year**, which
*"could result in accelerated herbicide resistance or additional in-season applications,
costing Arkansas producers upwards of $60 million per year."* Lead researcher **Jason
Norsworthy, Distinguished Professor of weed science**, is on record: *"All of my data would
indicate that using the high-sensitivity setting is best in most scenarios"* — at which
control is comparable to broadcast and herbicide savings stay substantial.

## Path to green
The headline already rests on independent academic measurement — a peer-reviewed paper plus a
second, independent university field study — which is a stronger footing than a single-vendor
or single-client attestation. Green requires only a human confirmation step:
1. Re-archive all four sources to web.archive.org (the Internet Archive was "Temporarily
   Offline" this session; local `sources/` copies are saved in the meantime).
2. A recorded confirmation from **Jason Norsworthy / Tristen Avent** (University of Arkansas)
   or **Doug Houser / Matt Darr** (Iowa State) that the figures, measurement windows, and
   sensitivity settings are represented correctly.