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STEPS
TO INTERPRETATION: CORRELATE - Compare patterns of relative crop conditions on the map versus field history and what you see on the ground. Draw boundaries around zones of similar crop conditions. CALIBRATE - Quantify the estimated yield differences between the good, fair, poor zones in the field. CALCULATE - determine economic cost/benefit by calculating yield differences by zone x acres x price, less the cost to fix. NUMBERED COMMENTS 31. Crops drowned out - pothole (0.3 acres) 32. High performing, robust crop area 33. Strip of heavy vegetation. Cause yet unknown. 34. Drownout area in waterway (2.7 acres). Little living vegetation. 35. Strip of healthier, more actively growing corn (2.9 acres). Cause as yet unknown. Speculation by manager of nitrogen overlap. 36.Strips of less robust corn. Cause unknown. 37. Generally less robust area of field (19.7 acres). Cause unknown. 41. Crops drowned out (1.4 acres)- little living vegetation. 42. Poor crops. Drowned out area. 43. Large area of healthy, robust crops. 45. Drowned out crop area (1.4 acres). Little living vegetation. 46. Area of different corn variety (25.8 acres). This is not necessarily better or worse than the rest of the field, but does have different leaf structure. Soils on this farm are some of the best in Nebraska with not a lot of differences between them that would have a significant impact on relative crop performance. Source: USDA SSURGO Soils data. Topography is generally flat to very gently rolling on this farm. Source 10m USGS NED. Natural Color (R,G,B) images are unable to fully detail crop health patterns because they do not include NearInfrared (NIR) light reflected from the crop canopy. NIR shows the relative volume and healthiness of leaves. |