Professor Mário Carvalho’s research interests are related to different aspects of low input cropping systems; tillage systems, crop rotation, integrated weed control and nutrient management. In addition he has developed a very close contact with producers over the past 30 years, establishing a solid scientific and practical knowledge of cropping system management under conservation agriculture. More recently his focus has been on the use of symbioses, specifically arbuscular micorrhiza and rhizobia, in bio-protection of cultivated plants within the cropping systems.