The Connection between Soil crop and manure
Bo D Pettersson 1958 - 1990
This report contains the results from of a long-term field trial during the years 1958 to 1990. The field trial was conducted at the Järna Institute of the Scandinavian Research Circle for Biodynamic Agriculture and it had the same layout during the whole period. The quality trial, or the K-trial, as it was more commonly called, ought to be unique, as it gives us the possibility to study how different fertilizer-types effects soil and crop on a long-term basis.
During the entire experiment period, the same person was responsible for maintenance and evaluation, namely agr. lic. Bo D. Pettersson. Until his death in March 1992, he worked with the final compilation of the results from the K-trial.
Since 1990 some of his younger colleagues helped him out in this task. Bo did kindly place all his experience at the disposal to the ones who were destined, to give the final touch to his accomplished life mission. His unexpected death made a severe interruption in the work. What we have been able to do in this report is to add the computer-technology to the rich and vivid experience that Bo collected during all the trial-years. In the line of work Bo was always a source of inspiration and ideal. It is our hope, that the reader of this report will be able to experience some of the qualities that made Bo into one of the great research pioneers within the biodynamic agriculture.
It has been impossible for us to discuss all the different issues that the rich material awakens. Hopefully the results from the K-trial in this writing, contributes to the continuation and inspiration of researching the correlation between fertilization, soil and crop.