Posted 3/15/2019 11:48 (#7382121 - in reply to #7381141) Subject: RE: Climate fieldview
You can search me and ccfv and read several examples. Basically its all about the base data being spatially accurate or not. Surrgo is not spatially accurate at least for precision ag purposes. Hand drawing a few zones is not as good as a computer analyzing every pixel. Using 1 years yield data that has not been cleaned up is not very good. Using 1 sat image is not really representative either. When yields range from 140 bu to 260 bu (120 bu range, or even if only 40 bu whatever) in a field and then you magically divide that into 3 or 5 or 7 zones (or ranges) and put a single seed rate to each zone you get these big seed jumps. Or maybe you only change rates a few thousand (2-4k) when it might need to be changed 12-20k to really capture seed savings and increase yields. Its really fairly simple yet very complex and there is no one set algorithm for every situation. Its an art as much as technology. There are lots of angles to consider that influence your results. Ultimately you need to get to a certain amount of grain per plant and that is related to bu per seeds planted and that related to water and available nutrients.