[3] Using various technical publications and his years of field research, he devised a test to determine appropriate calcium levels necessary for various types of soils and growing media to encourage optimum economical plant growth, health, and reproduction.
Tiedjens developed a program utilizing the combination of the ideal growing environment and nutrient stimulation of the plant to bring about the best economical and nutritional system for the farmer.
The program has been successfully used on a wide scale, from a potato farm in Aroostook county Maine, grain and dairy operations in the Midwestern United States and Canada to a produce farm on Mexico's Yucatán peninsula, showing that it can be adapted to any agricultural operation.
Tiedjens was an assistant research professor at Massachusetts State College (1923–1928) and did postgraduate work at Harvard (1928).
He was appointed the director of the Virginia Truck Experimental Station Norfolk, VA (Currently Hampton Roads Agricultural Research and Extension Center) (1945–1951).
He was also appointed U.S. Department of Agriculture coordinator for the regional research laboratories at Germantown, Pennsylvania and Charleston, South Carolina.
He was founder, vice president, and director of research for Growers Chemical Corporation (1955–1972) and chairman of the board from 1972 until his death in 1975.
In 1952, Tiedjens was awarded the Thomas Roland Medal by the Massachusetts Horticultural Society for outstanding work in his field.