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| Web URL(s): | https://dl.sciencesocieties.org/publications/aj/pdfs/68/3/AJ0680030534
Last checked: 12/08/2016
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| Publication Type:
| Refereed |
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| Author(s): | Volk, G. M.;
Dudeck, A. E. |
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| Author Affiliation: | Volk: Soil Chemist, Department of Soil Science; Dudeck: Turf Specialist, Department of Ornamental Horticulture, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, Florida |
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| Title: | Abnormal color response of turf ryegrass to top-dressed isobutylidene diurea |
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| Source: | Agronomy Journal. Vol. 68, No. 3, May/June 1976, p. 534-536. |
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| Publishing Information: | Madison, WI: American Society of Agronomy |
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| # of Pages: | 3 |
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| Keywords: | TIC Keywords: Sulfur-coated urea; Nitrogen; IBDU; Lolium perenne; Cynodon; Tissues; Toxicity; Chlorophyll; Ureaformaldehyde; Slow-release fertilizers; Comparisons; Ammonium; Soil pH
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| Abstract/Contents: | "Isobutylidene diurea (IBDU) is an excellent source of controlled-release N for turfgrasses, but certain reports imply a generally low toxic potential not completely supported by recent Florida work. To evaluate toxicity, IBDU (0.7 to 1.4 mm diam. pellets) was used in single applications at 1 to 7.3 kg N/are rates on winter ryegrass (Lolium perenne L.) and a 1.5 to 5.9 kg N/are on bermudagrass (Cynodon sp.), the latter in all combinations with 0, 0.25, and 0.50 kg urea-N/are every week, and of 0 and 2.4 kg Ca(OH)2/are at initiation of tests. A 2.2 kg N/are rate of IBDU resulted in chartreuse green ryegrass when soil pH was above 7.0. At 3.3 to 7.3 kg IBDU-N/are the ryegrass was chartreuse-yellow at 1 month after application, regardless of soil pH. Tissue analysis showed an excellent inverse correlation with Mn content. There was no off-color response to sulfur-coated urea or ureaform applied at N rates equivalent to those above. Color assessment by chlorophyll extraction with methanol supported visual observations. There was no toxic response of bermudagrass to IBDU at soil pH 5.1 to 7.3 or at any combination of IBDU with Ca(OH)2 and/or urea Application of IBDU "fine" to ryegrass apparently should not exceed 2.0 kg of N/are if visual toxicity symptoms are to be avoided." |
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| Language: | English |
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| References: | 5 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Volk, G. M., and A. E. Dudeck. 1976. Abnormal color response of turf ryegrass to top-dressed isobutylidene diurea. Agron. J. 68(3):p. 534-536. |
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| Web URL(s):
https://dl.sciencesocieties.org/publications/aj/pdfs/68/3/AJ0680030534
Last checked: 12/08/2016
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: S 22 .A45 |
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