For a couple of years now its been common to use leaf sample analysis in the cultivation of starch and storage potatoes. Common use of this technique is when the plants touch each other the leaves can be picked and sent to the nutricontrol laboratory. once arrived there they get tested and results are sent to Delphy within that day. this results in a 3 day span between picking and results which gives fast chances to adjust your nutrient giving. these leaves are tested for 18 different variables such as potassium, nitrate, ammonia, phosphate, manganese and magnesia. these nutrients can be applied through canopy treatments and are therefore directable and measurable during the season. this gives the grower a quick and safe way of analysing and acting on actual deficiencies of these macro and micro nutrients. for the 3 major nutrients nitrogen, potassium and magnesia, Delphy has developed trajectories for the amount that needs to be available during the season, giving the grower direct insight into the status of his crop.