Dr. Tony Koski, Colorado State University, 1993
Fertilizer Source Evaluations on Perennial Ryegrass at Colorado State University.
Leam Chabang Country Club, Chol Buri
1. In treatments 1,3,5 quality of grass is comparable until 6 WAA after which the untreated 5 dropped significantly.
2. Quality of the cored plots (2,4,6) differed from 2 WAA with the treated plots gave significantly better quality.
3. Recovery from coring is much better in the Sustane treatments (2 and 4) compared to the untreated 6.
Accordia Golf Management & Sumitomo Corporation, Daiatsugi Country Club Hon Course and Daiatsugi Sakura Course, 2006
Compare two different greens grade slow release nitrogen fertilizers, a 100% coated synthetic slow release nitrogen fertilizer (Simplot’s GreensKote 18-3-18 and Sustane Natural Base 10-2-10+Fe on Bentgrass putting greens, in [prefecture]. Japan.
Matt Klingenberg, Chris Blume, and Nick Christians, Iowa State University, 2006
The purpose of this trial was to evaluate nitrogen (N) release from several experimental, natural organic fertilizers and to compare them to industry standards. This trial was located at the Iowa State University Horticulture turfgrass research station near Gilbert, Iowa.
Christopher J. Blume, Nick Christians, and Y.K. Joo, Iowa State University, 2005
The objectives of the 2005 nitrogen (N) source study were to compare the turf response and N release rates of various experimental fertilizer products being proposed for marketing to a number of industry standards, such as Milorganite, Sustane, Nature Safe, Corn Gluten Meal, Renaissance, and urea. An untreated control was also added for comparison. The research was conducted at the Iowa State University turfgrass research area north of Ames, Iowa on Nassau Kentucky bluegrass turf.
Natural Organic Source Study,M. L. Agnew, Iowa State University 1993
The objective of this study is evaluate the effects of different natural organic nitrogen sources on Kentucky bluegrass growth.
Charles H. Peacock, Associate Professor, North Carolina State University, Department of Crop Science, College of Agriculture and Life Sciences, 1992
Sustane 5-2-4 provided exceptional growth characteristics after nitrogen became more readily available in August, September and October.
T. Hsiang and L. Yang Guelph, Turfgrass Institute University of Guelph, 1995
This is a 3-year study, which started in June 1994. The major objectives are to evaluate some turfgrass amendments or conditioners and compare them against a traditional synthetic treatment on turfgrass plots.
Specific effects being examined include:
1)Effects on turf quality and esthetics in terms of functional features (colour, density, and general appearance) 1994-1996
2) Effects on turfgrass disease control such as dollarspot and snow mould: 1995-1996.
3) Effects on thatch development and thatch pH: 1994-1996. 4) Effects on the development of a newly built and newly seeded bentgrass green over the first several years of establishment: 1994-1996.
Michael L. Agnew, Ph.D., Iowa State University, 1992
Natural organic nitrogen sources have been a staple in golf course management for years. They are valued for their low burn potential and long-lasting effects on Turfgrass. But today, synthetic fertilizers are produced in mass quantities at significantly lower costs than their organic counterparts. The benefits once obtained only from natural organic products can now be found in less expensive synthetic nitrogen fertilizers.
What benefits do natural organic nitrogen sources have over the synthetic versions?
Benefits claimed by manufactures of organic fertilizer include reduced disease activity, reduced thatch buildup, thatch reduction, reduced soil compaction and reduced nitrate movement. However, investigation of these claims first requires an understanding of just what can be called a “natural organic nitrogen fertilizer.”
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.