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Fluid Journal : Fluid Journal 2008-2009
Matt Wiebers, Dr. Matias Ruffo, and Dean Fairchild !"#$%&' !"#$%&'()*+,-&'(*"(./0(1'+%2(10,.%'%30,(1*+-2&.%*- !"#$%! !"#$%&'()*+%,--. /012%345%602%75%899:$%;<= !"#$%&'()*+,#-./*0.,12&3/24,#5'/3'), 6'43'(3)3/-,7&+,83*)+,"2/*&/3') !""#$%&'$()*+&',*%()'+(##,+-.*/-,0*$)*%()1/)%'$()*2$'3*&*4$,#0* 5()$'(+.*&+,*&)*,66,%'$7,*2&4*'(*8,),+&',*#(%&#*()96&+5*+,-/#'-: There is a need for guidance on how farmers can use precision agriculture technologies to conduct on-farm research studies. Both farmers and dealers prefer to use local data to make management decisions, but they have lacked guidance on a practical approach to perform such studies with this technology. Coupling the high degree of accuracy now possible with these systems and a compatible research protocol, farmers and dealers have access to a powerful set of tools to build local databases. The advances in the technology surrounding precision agriculture continue to grow and the cost of these systems is now within the budget of almost every farming operation. Current technology GPS. Many progressive farmers have purchased high-end GPS receivers for tractors and combines to use in auto-steering guidance. These GPS receivers have the capability of using differential correction from multiple sources such as RTK, WAAS, and Omnistar. The accuracy of each correction source is different, but all systems are now measuring accuracy in inches versus feet when GPS was introduced into agriculture. In addition, most of these new receivers are versatile enough to use either the US GPS system or the Russian GLONASS system. The accuracy of these systems allows farmers to know virtually every inch of their field. Control/Logging. In the past, rate controllers and a logging computer were often separate boxes in the tractor cab. Figure 1 shows an AgLeader PF3000 monitor and Hiniker 8605 rate controller. In this example, the GPS latitude and longitude position is received by the AgLeader system. The corresponding application rate is determined from a prescription map loaded onto the data card. The AgLeader system transmits the desired (target) rate to the Hiniker rate controller via a serial cable. The rate controller recognizes the rate change and makes an adjustment to the rate. Simultaneously, the actual applied rate is being read by the rate controller and logged by the AgLeader system. This process repeats every couple of seconds. This process works well, but it is subject to problems. These problems can include improper cables, loose connections, and damaged connectors or pins. Fortunately, the next generation of controllers such as the Raven Viper Pro, AgLeader Insight, Greenstar 2, Topcon X20, and AgCo Fieldstar have eliminated many of the challenges inherent in connecting different systems together. These integrated systems reduce cab clutter, use color touch screens, and have intuitive displays. Current approaches A review of available literature on the topic of on-farm research reveals an emphasis both on the design of the experiment and collection of calibrated yield data. However, there is little discussion about the importance of collecting the as- applied data. Experience tells us that even under ideal conditions the Figure 1. AgLeader PF3000 and Hiniker 8605 rate controller.
Fluid Journal 2005-2007