If we broadcast fertilize P&K, and most of us do, we really don't know how our crops respond to higher or lower rates. There are so many other factors involved in making or not making a good yield. Bugs, fungus, the timing of rain or heat, warm nights, cool nights and hybrids all have as much or more of a factor in it than fertility. Maybe if a person zone tilled and varied his fertilizer rates in side-by-side swaths all the way across the field he might eventually get a grasp on it but just throwing it out there isn't very accurate.
I have my land grid sampled in 2 acre grids. It costs me a bunch and I've been getting good yields, but I tend to think mother nature has a bigger hand in the good yields than the grid sampling does. Manure has something special in it that commercial fertilizer doesn't. Most of the land in this area is manured with hog, chicken or turkey manure and those guys are smiling all the way to the bank. I got hog manure a year ago and I had to give my soil sample records to the applicator for his records to keep it legal. Jim
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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