Full TGIF Record # 98723
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Web URL(s):http://www.wsweedscience.org//wp-content/uploads/proceedings-archive/2004.pdf#page=42
    Last checked: 12/10/2013
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Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Greenfield, Brian J.; Schroeder, Jill; Thomas, Stephen H.; Murray, Leigh
Author Affiliation:New Mexico State University, Las Cruces, New Mexico
Title:The effect of nitrogen and potassium levels on the relationship between purple and yellow nutsedges and southern root-knot nematodes
Section:Basic science
Other records with the "Basic science" Section
Meeting Info.:Colorado Springs, Colorado: March 9-11, 2004
Source:Proceedings of the Western Society of Weed Science. Vol. 57, 2004, p. 40.
# of Pages:1
Publishing Information:Newark, CA: Western Society of Weed Science
Keywords:TIC Keywords: Nematoda; Fertilization; Symbiosis; Ammonium nitrate; Cyperus rotundus; Cyperus esculentus; Potassium sulfate; Relationships
Abstract/Contents:"Previous research conducted at New Mexico State University has found a mutually beneficial relationship between purple and yellow nutsedges and southern root-knot nematodes Meloidogyne incognita. These studies were fertilized regularly according to crop management practices. A later study evaluated nutsedge response to the nematode in soil where the fertility was not maintained. The results of this study contradicted our original observations because the nematode decreased growth of both nutsedge species. We hypothesized that the beneficial relationship between yellow and purple nutsedge and root-knot nematode is dependeant on maintaining soil fertility. Therefore, a greenhouse study was conducted during 2003 to examine the effect of nitrogen and potassium on this relationship. The design was a randomized complete block design with treatments arranged in a five (nitrogen) by two (potassium) by two (nutsedge species) by two (nematode) factorial. One tuber of either purple or yellow nutsedge was planted per pot and half of the pots were inoculated with root-knot nematode eggs. Pots were fertilized based on recommendations for chile peppers at 100, 75, 50, 25, or 0 percent of the recommended nitrogen rate divided into eight weekly applications of ammonium nitrate. Pots received either zero or 100 percent of the recommended rate of potassium, as potassium sulfate, at planting. After the eighth nitrogen application, pots were destructively sampled. Preliminary results indicate that potassium increased shoot and root biomass of yellow nutsedge. Shoot biomass from nematode infested plants treated with potassium was equivalent to nematode-free plants averaged across both species. Tubers were separated into categories by fresh weight into small (less than 0.05 g for yellow nutsedge, less than 0.31 g for purple nutsedge), medium (0.05 to 0.12 for yellow nutsedge, 0.31 to 0.91 g for purple), and large (greater than 0.13 g for yellow nutsedge, greater than 0.91 g for purple nutsedge[)]. Potassium increased medium-tuber dry weights but only at the 100 percent nitrogen level, when averaged across both nutsedge species. Potassium increased large tuber dry weights when averaged across all other treatment levels. Overall, nutsedge biomass increased at a greater rate for nematode-free plants as nitrogen levels increased compared to infested plants. It appears that potassium, or perhaps the interaction between potassium and nitrogen may affect the interaction between root-knot nematodes and these nutsedge species."
Language:English
References:0
Note:"This article appears as abstract only."
See Also:Other items relating to: Potassium
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Greenfield, B. J., J. Schroeder, S. H. Thomas, and L. Murray. 2004. The effect of nitrogen and potassium levels on the relationship between purple and yellow nutsedges and southern root-knot nematodes. Proc. West. Soc. Weed Sci. 57:p. 40.
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Web URL(s):
http://www.wsweedscience.org//wp-content/uploads/proceedings-archive/2004.pdf#page=42
    Last checked: 12/10/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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MSU catalog number: SB 610 .W43 v.49
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