PACE Turf - Turfgrass Information Center

Evaluation of Manure Ash Fertilizer Formulations to Provide Nitrogen

Summary: Three manure ash products were formulated for use at golf courses to supply potassium and nitrogen. Product 1 (P1) is a potassium (K) source primarily using ash. Product 2 (P2) is a K and nitrogen (N) source using ash and urea. Product 4 (P4) is a potassium and nitrogen source using ash and blood meal. Eco Soil Systems 0-2-34 was used as a commercial product comparison.

Each product was applied to a golf course approach area to determine efficacy in delivering potassium and nitrogen to the turfgrass. Turfgrass tissues collected from P2 treated areas reported significantly higher K and N levels than the other treatments. All three products increased tissue potassium levels compared to the non-treated check plots two weeks after treatment (WAT). None of the products provided significant increases in tissue K or N at the 4 or 6 WAT evaluations. In addition, none of the products significantly increased soil K levels. Product 2 performed significantly better than the commercial standard (Eco Soil Systems 0-2-34) based upon 2 WAT tissue evaluations. Products 1 and 4 were equivalent to the commercial standard for K and N tissue levels but both products exceeded the commercial standard in clipping weight at 2 WAT. Based upon these results and the discussion below, all three products are suitable for use as potassium sources and the nitrogen containing products 2 and 4 improved turfgrass color.

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Principal Investigator: Larry Stowell

Cooperators: Eric Lover and Tony Miller, Dove Canyon Country Club

Sponsor: New Charleston Power, El Centro, CA

Research Guide

New products, new ideas, new pests and problems and new controversies abound in the world of turfgrass management. Combined with the currently registered pesticides, fertilizers, amendments, and various new pieces of cultivation equipment and turfgrass management approaches, the task of selecting the correct blend of products and practices can sometimes be daunting. The only way to gain more confidence that a management system is the best one for your site is to start a testing program at your golf course, as outlined in this guide. Part I of this Research Guide, "Getting Started", will describe the basic elements of testing program, attitude, components of an experiment, record keeping; Part II, "Experiment Design", will provide expanded details on how to set up experiments that will be simple and efficient, plot design, replication and randomization techniques will be discused; Part III, "Interpreting Results", will provide a background on how to evaluate your findings and how to decipher scientific publications with an introduction to basic statistics.

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Efficacy of herbicides for Poa control on overseeded fairways

Summary: In replicated field trials conducted on common bermudagrass fairways that were overseeded with perennial ryegrass, rates and timing of various herbicides were evaluated for Poa annua control efficacy. Key results include:

  • Pre-emergence herbicides such as Dimension and Barricade continue to be most effective when applied prior to overseeding, as opposed to after overseeding.
  • Applications made post-overseeding required higher rates of Dimension (200 lbs/A of the 0.25G formulation) to achieve the same efficacy observed at lower rates (150 lb/A) applied before overseeding.
  • The efficacy and longevity of split applications was evaluated, but was difficult to assess, due to low populations of Poa annua.
  • None of the treatments tested caused damage to either ryegrass or bermudagrass.

Printable version of full report

Principal Investigators: Wendy Gelernter, Ph.D. and Larry J. Stowell, Ph.D., CPPP, CPAg Cooperators: Nancy Dickens, Mountain Vista Golf Course Sponsor: Rohm and Haas

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