Then, the sprayer uses a microcomputer to automatically vary the nitrogen rate in a topdress application. Team work Solie and Raun are working with ag engineer Marvin Stone and others on additional tests. However, since the cameras ar etaking many pictures, the sensing frequency is roughly every 2 to 3 inches. The cameras detect light in the red, green and near-infrared wavelengths. The values are calibrated to various levels of nitrogen uptake.
Application is adjusted by opening or closing individual nozzles.
That could be cut if sensor spacing were increased. He says the return to this investment will vary. If a producer is over-applying nitrogen, then it will cut costs. If field average rates are correct, then parts of the field may b eeither over- or underfertilized. Variable rates won't sav efertilizer, but will increase yields.