M. L. Agnew and S. M. Berkenbosch, Iowa State University, 1992
The purpose of this study was to compare nine natural organic fertilizers to urea.Treatments included BioTurf 10-4-4, Sustane medium grade 5-2-4, Sustane fine grade 5-2-4, ISU experimental (10% N), Milorganite 6-2-0, Natures Preference 5-3-5, Ringer 10-2-6, Ringer 6-1-3, Howe 5-2-5 (added in 1990), Urea 46-0-0, and a control. All fertilizers were applied at 1 lb N/1000 ft2 on May 15, June 15, August 15, and September 15, 1989. This study was replicated three times in a randomized complete-block design. Individual plot dimensions are 5 ft by 10 ft.
View Research Paper
Pat2h Horticultural Consulting, Rydal, Georgia, 2010
Suståne was tested in conjunction and side by side to liquid fertilizers on tomato plants in 4" pots
The objective of the trial was to evaluate efficacy of various organic fertilizers on germination rate and initial plant growth (first 4weeks) of common vegetable plant species in a Georgia topsoil. The plant species tested were lettuce, peas, radish and spinach. Twenty seeds of each species were sown along a 21‐inch long furrow. The fertilizers used were Suståne 4‐6‐4 organic, Scotts Miracle Grow 7‐1‐2 “Organic Choice”, Espoma 4‐3‐3 Biotone Starter Plus and an experimental vegetable seed starter containing Suståne. Each fertilizer was applied as broadcast application with the exception of the experimental seed starter, which was applied in a band directly to the seeded furrow. Adequate soil moisture was maintained daily, as needed, by hand watering.
