Roberts, JSchäbitz, BWerner, ACurrie, LDBuskitt, LL2017-10-122015-02Roberts, J., Schäbitz, B., & Werner, A. (2015). Active light sensing of canopies in crop management: Pastures and arable crops. In L.D. Currie and L.L.Buskitt (Eds.), Moving farm systems to improved nutrient attenuation: Occasional Report No. 28. Fertilizer and Lime Research Centre, Massey University, Palmerston North, New Zealand. Retrieved from http://flrc.massey.ac.nz/workshops/15/Manuscripts/Paper_RobertsJ_2_2015.pdfhttps://hdl.handle.net/10182/8681A field spectrometer with an active light source was tested as a potential canopy sensor for dairy pastures (‘TEC-5’, YARA). To study the applicability of the sensor on pasture for the intensive radiation conditions of NZ we first conducted two sensitivity experiments. Additionally, a plot experiment was designed to calibrate sensors on ryegrass and white clover canopies fertilised with five different nitrogen amounts. The pasture plots were sensed with the spectrometer and results compared with measured biomass amount and nitrogen content.7 pagesen© The Authors and FLRCarable cropsspectorometercrop managementpasturesConference Contribution - publishedANZSRC::0703 Crop and Pasture ProductionANZSRC::079902 Fertilisers and Agrochemicals (incl. Application)2230-3944