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Turf Response to Triazine Carriers as Influenced by Pseudomonas Inoculant

Dep. of Crop Science, Box 7620, North Carolina State University, Raleigh, N8 27695.

^* Corresponding author.

Triazines have potential for use as slow-release N fertilizers. Their degradation by microbial activity and subsequent N mineralization rate is reduced in less microbially active soils. The objective of this study was to determine the influence of Pseudomonas inoculant on the efficacy of triazine fertilizers. Turf response to ammeline (4,5-diamino-1,3,5-triazin-2(lH)-one) and melamine (1,3,4-triazine-2,4,6-triamine) inoculated with a 1, 5, or 10% Pseudomonas sp. bacterial culture was investigated on ‘Tifway’ bermudagrass (Cynodon dactylon L. Pen. x C. transvaalensis Burtt-Davy) and compared to IBDU (isobutylidenediurea) and urea N carriers. During 2 yr of study, overall turf quality was acceptable for all carriers, but was best for those plots receiving IBDU, ammeline, and melamine/urea (M/U ) with quality ranging from 6.9 to 7.7. Turf growth was not influenced by N sources the first year. During the second year, weekly shoot growth was greater from plots receiving ammeline and IBDU compared to melamine and M/U (up to 30%). Addition of inoculant to the melamine lowered turf quality by almost a whole point and weekly shoot growth was as much as 40% greater where no inoculant was added. Turf quality reductions with melamine were inoculant-rate responsive. Inoculant addition failed to provide a microbially competitive advantage over naturally occurring soil organisms to stimulate increased degradation and N release for turf performance.

Received for publication July 22, 1991.