Full TGIF Record # 196919
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Web URL(s):http://era.deedi.qld.gov.au/1315/1/LoweComparativeProductivity-sec.pdf
    Last checked: 1/31/2012
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Author(s):Lowe, K. F.; Fulkerson, W. J.; Walker, R. G.; Armour, J. D.; Bowdler, T. M.; Slack, K.; Knight, R. I.; Moody, P. W.; Pepper, P. M.
Author Affiliation:Lowe, Walker, and Bowdler: Department of Primary Industries and Fisheries, Mutdapilly Research Station, Peak Crossing, QLD; Fulkerson: University of Sydney, Camden, NSW; Armour: Department of Natural Resourses, Mines and Energy, Centre for Tropical Agriculture, Mareeba, QLD; Slack: NSW Department of Industries, Wollongbar Agricultural Institute, Wollongbar, NSW; Knight: Department of Primary Industries and Fisheries, Kairi Research Station, Kairi, QLD; Moody: Department of Natural Resources, Mines and Energy, Indooroopilly, QLD; Pepper: Department of Primary Industries and Fisheries, Animal Research Institute, Moorooka, QLD, Australia
Title:Comparative productivity of irrigated short-term ryegrass (Lolium multiflorum) pasture receiving nitrogen, grown alone or in a mixture with white (Trifolium repens) and Persian (T. resupinatum) clovers
Source:Australian Journal of Experimental Agriculture. Vol. 45, No. 1, 2005, p. 21-39.
# of Pages:19
Publishing Information:East Melbourne: Commonwealth Scientific and Industrial Research Organization (Australia)
Related Web URL:http://www.publish.csiro.au/?paper=EA03105
    Last checked: 1/31/2012
    Notes: Abstract only
Keywords:TIC Keywords: Experimental products; Fertilization; Nitrogen fertilizers; Trifolium repens
Abstract/Contents:"Dairy farms in subtropical Australia use irrigated, annually sown short-term ryegrass (Lolium multiflorum) or mixtures of short-term ryegrass and white (Trifolium repens) and Persian (shaftal) (T. resupinatum) clover during the winterspring period in all-year-round milk production systems. A series of small plot cutting experiments was conducted in 3 dairying regions (tropical upland, north Queensland, and subtropical southeast Queensland and northern New South Wales) to determine the most effective rate and frequency of application of nitrogen (N) fertiliser. The experiments were not grazed, nor was harvested material returned to the plots, after sampling. Rates up to 100 kg N/ha.month (as urea or calcium ammonium nitrate) and up to 200 kg N/ha every 2 months (as urea) were applied to pure stands of ryegrass in 1991. In 1993 and 1994, urea, at rates up to 150 kg N/ha.month and to 200 kg N/ha every 2 months, was applied to pure stands of ryegrass; urea, at rates up to 50 kg N/ha.month, was also applied to ryegrass-clover mixtures. The results indicate that applications of 50-85 kg N/ha.month can be recommended for short-term ryegrass pastures throughout the subtropics and tropical uplands of eastern Australia, irrespective of soil type. At this rate, dry matter yields will reach about 90% of their potential, forage nitrogen concentration will be increased, there is minimal risk to stock from nitrate poisoning and there will be no substantial increase in soil N. The rate of N for ryegrass-clover pastures is slightly higher than for pure ryegrass but, at these rates, the clover component will be suppressed. However, increased ryegrass yields and higher forage nitrogen concentrations will compensate for the reduced clover component. At application rates up to 100 kg N/ha.month, build-up of NO3--N and NH4+-N in soil was generally restricted to the surface layers (0-20 cm) of the soil, but there was a substantial increase throughout the soil profile at 150 kg N/ha.month. The build-up of NO3--N and NH4+-N was greater and was found at lower rates on the lighter soil compared with heavy clays. Generally, most of the soil N was in the NO3--N form and most was in the top 20 cm."
Geographic Terms:subtropical Australia
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Lowe, K. F., W. J. Fulkerson, R. G. Walker, J. D. Armour, T. M. Bowdler, K. Slack, et al. 2005. Comparative productivity of irrigated short-term ryegrass (Lolium multiflorum) pasture receiving nitrogen, grown alone or in a mixture with white (Trifolium repens) and Persian (T. resupinatum) clovers. Aust. J. Exp. Agric. 45(1):p. 21-39.
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DOI: 10.1071/EA03105
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    Last checked: 1/31/2012
    Requires: PDF Reader
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MSU catalog number: S 19 .A8
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