 We believe what we see and that is true for many areas But especially when it comes to science and within science. There are still some areas. We need to get a better insight to Soils for example one of the most important systems on earth as they feed the world in Order to grow enough food or fertilizers are used nitrogen fertilizers in particular and One of the main players there is ammonia and H3 Due to the growing population the fertilizer use increases every year By that more ammonia is added to the environment Which leads to negative environmental impacts In order to mitigate that we need to get a better insight and a better understanding of soil processes after fertilization There are some things that are quite hard to see for the human eye such as chemicals or biological processes My solution to that is To take images with the help of chemistry and this is what I'm working with optical chemical sensors With which we can make certain analytes visible in two dimensions and in real time with chemicals light and cameras And the obtained images can be processed in a way so that the different colors stand for different concentrations for each analyte Giving us the information that we need And in my research I developed a new optical sensor for ammonia Which are used together with optical sensors for pH and oxygen within soils By using these sensors within soils and fertilizers. I obtained three things Firstly, I was able to visualize the ammonia distribution within but also above soils from different fertilizers as you can see here Secondly Simultaneously, I measured and imaged the pH and the oxygen changes within the soil and correlated that to the ammonia distribution and thirdly These images were used to Take as a guided map for hotspots and also to do more informed soil sampling thereby We got high resolution insights into the soil microenvironment after fertilization And with these findings it is a we are able to make agriculture more sustainable now Do you also think that we need more images of fertilizers in soils? I Do because we believe what we see Thank you