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One more AgLeader 2000 question
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John Burns
Posted 6/20/2006 00:48 (#20704 - in reply to #20633)
Subject: Re: One more AgLeader 2000 question



Pittsburg, Kansas

Afraid plowboy is right on this one. The AL manual states what the best kind of calibration loads are. For the load to accurately reflect a particular flow rate the whole load needs to be combined AT that rate. It would get pretty tedious to combine a full semi load at 1 mph, another semi load at 2 mph, another at 3 mph, etc.. If you just cut a semi load at varying speeds (varying flow rates) and put it in as a cal load you are going to have a bunch of different flow rates averaged. As long as you cut average flow rates in the field it will be very accurate but when you get in high or low flow rate areas of the filed accuracy will degrade rapidly. This kind of defeats the purpose of measuring of the yield variability in the field which is all a yield monitor is really accurate enough for anyway. Another thing is if you have one cal load that is a semi load and another one that is 4000 pounds, the monitor will weight the calibration based on the load size towards the large load. So it is important to use reasonably similar size cal loads at the different flow rates. AL reauires a lot more work to calibrate but if done properly will give good results across a range of yields. We have very good luck in corn, fair in wheat and marginal in soybeans. The higher the flow rate, the better the accuracy. 5-20 bpa beans don't measure very well although the map will show variability. A little dirt or green sticky beans stuck in the elevator or on the impact plate with beans just kills any resemblence of accuracy in beans, especially low yielding beans.

Calibration is a pain and we have scales on our grain cart which makes it about as easy as it gets. After market cart scales have gotten very reasonably priced and are well worth the investment. They help in a lot of ways besides calibrating yield monitors - don't forget to calibrate the grain cart. I hope there is better yield monitor technology someday. I have always thought that scales on the combine grain tank would be the proper way to measure yield - real weights instead of throwing grain at a plate.

John



Edited by John Burns 6/20/2006 01:02
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