The Blog

In addition to the content and educational material Precision.AgWired.com brings to you, be sure to visit these valuable Web sites for more precision guidance information. Also, be sure to visit Farm Industry News for the latest newsletter from the FIN editorial team!

Precision Agriculture Website — Ohio State University

Site-Specific Management Center — Purdue University

Precision Agriculture Center — University of Minnesota

The approximately 29 GPS (Global Positioning System) satellites each circle the globe twice a day — 11,000 miles overhead — to receive/send radio signals to GPS receivers. Six to eight of them are directly visible to a GPS antenna at any time.

To accurately track and steer your moving tractor/sprayer/combine, your GPS receiver needs five or more tracking channels (four are needed for good 3-D position estimates; the other channels scan for satellites just coming into view to replace those leaving radio range). It should have an update rate of 5 Hz to ensure enough data are being sent, and it must be compatible to receive your desired signal(s).

Because these satellite signals produce unavoidable errors — which is understandable when radio signals travel at the speed of light (186,000 mps) 11,000 miles one way — differential correction with a stationary receiver is necessary for repeatable tasks.

To understand your GPS signal choices and ground-based stations, check out the April issue of Farm Industry News and read the story “Automated Steering Basics.”

The real-time kinematic (RTK) signal offers the highest accuracy — within 1 in. — which is repeatable pass after pass and year after year. With this accuracy, growers can now strip-till and band fertilizer in the fall, then come back in the spring and plant (day or night) directly on top of the fertilizer in the middle of the strip — without steering.

When growers begin to till and fertilize in field strips instead of broadcasting—and achieve the same or higher yields—the savings quickly become obvious.

Other growers use RTK (Deere calls its network StarFire RTK, along with its industry-exclusive RTK Extend) to plant on top of buried drip irrigation tape or on beds, as well as plant varied seeding rates or apply varied nutrient rates based on field maps.

Content courtesy of Farm Industry News.

GPS-guided assisted steering• Improves accuracy (tillage, planting, spraying, fertilization)
• Reduces fuel, seed, herbicide, fertilizer costs
• Allows daylight accuracy during night operations, at faster speeds
• Allows the driver to focus on the implement
• Reduces driver stress, body aches and pains

If you want any of these benefits, then you should consider this satellite-driven technology, now entering its 10th year on the market. It’s all about making your equipment more precise and more cost-effective … and giving yourself a break from stress, too.

University researchers — and farmers who use assisted steering — have proven a consistent 5 to 10 percent reduction in overlap. And in situations like spraying where you try to follow globs of disappearing marker foam 30 to 45 ft. to the side of your tractor, you can imagine that the payback from assisted steering can be even higher.

Now, do the math. There’s 5 to 10 percent fuel savings for every operation (tillage, anhydrous/liquid fertilizer, preplant/preemergent herbicides, planting, etc.). There’s 5 to 10 percent reduced cost for inputs (fertilizer, herbicides, etc.). To help you ballpark your own savings, use the Guidance Calculator on the right-hand side of this page.

Reducing overlap is just one way that assisted steering makes a farming operation more efficient. Experienced users with field data maps find even greater savings with variable-rate fertilizer, strip-tillage, varied seeding rates and numerous other methods.

Content courtesy of Farm Industry News.