Two-year experiment evaluating the effectiveness of organic fertilizers on the yield and growth of: Echinacea and Melissa varieties. Observed limited yield benefits from the addition of 100 lb N/acre or greater compared to the addition of only 50 lb N/acre over the control. From Leopold Center for Sustainable Agriculture, Iowa State University.

This report covers organic herb production research from 1999 to 2001. The focus is certified organic methods of fertilization and use of organic mulches for weed suppression. The results were not consistent. Compost increased herb leaf growth but not root growth. Imported biological fertilizers also increased plant growth and yields, but did not provide any advantage over locally produced compost. First-year results show a significant effect from natural mulches, including yield increase and weed suppression. From Iowa State University.

Three experiments were conducted at the University of Hawaii Waimanalo Experiment Station to determine the effect chicken manure, compost and urea applications have on the yield, nutrient status and sensory quality of basil.