Slurry tanker retrofitting with variable rate dosing system: a case study

摘要

To meet farmers' growing need to have appropriate tools to comply with environmental protection as well as with law requirements focused on livestock nitrogen management, a retrofit variable rate control system for slurry tankers (adaptable to both new and used equipment) was developed. Distribution trials, conducted at two typical forward speeds (2 and 3 km/h) and at three different nitrogen application rates (170, 250 and 340 kg/ha), showed that such a system was able to limit the difference between nominal and measured application rates below 9% with good spreading uniformity and without being significantly affected by forward speed.