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    • Journal of Range Management, Volume 53 (2000)
    • Journal of Range Management, Volume 53, Number 4 (July 2000)
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    N and P fertilization on rangeland production in Midwest Argentina

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    Author
    Guevara, J. C.
    Stasi, C. R.
    Estevez, O. R.
    Le Houérou, H. N.
    Issue Date
    2000-07-01
    Keywords
    phosphorus fertilizers
    economic analysis
    production costs
    soil fertility
    rain
    nitrogen fertilizers
    use efficiency
    biomass production
    application rates
    Argentina
    rangelands
    forage
    crude protein
    season rain-use efficiency
    nutrient use efficiency
    range fertilization economics
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    Citation
    Guevara, J. C., Stasi, C. R., Estevez, O. R., & Le Houérou, H. N. (2000). N and P fertilization on rangeland production in Midwest Argentina. Journal of Range Management, 53(4), 410-414.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/643782
    DOI
    10.2307/4003752
    10.2458/azu_jrm_v53i4_guevara
    Additional Links
    https://rangelands.org/
    Abstract
    Low soil nutrient status may be the major limiting factor to forage production in rangelands of the Mendoza plains 4 years out of 10. We studied vegetation responses to annual applications of N and P on such rangelands. Fertilizer application rates were 0 or 25 N and 0 or 11 P (kg ha-1) in a factorial arrangement. Dry matter production of grasses and palatable shrubs and crude protein (CP) content of grasses were determined annually from 1996 to 1998. Experimental plots received rains of 189, 278, and 346 mm during the 3 study years compared to mean growing season rainfall of 258 mm. Forage production was increased by N+P fertilization only in 1998 (1,390 vs 980 kg ha-1, P 0.05), producing 16.5 kg forage kg-1 N applied. Crude protein concentration was increased by N fertilization in 1997 (6.3 vs 5.3%, P < 0.05) and N+P application increased in 1998 (6.8 vs 5.7%, P < 0.05). Nitrogen and P application increased seasonal rain-use efficiency when the rainfall exceeded 300 mm. In 1998, the increase of grass production per kg N applied with and without P was 18.4 and 12.4 kg, respectively. The break-even point between rain and nutrients as the main primary production determinant on sandy soils in the central Mendoza plains is around 400 mm year-1 instead of 300 mm in other arid lands of the world. The value of meat increment derived from the N fertilization, with and without P application (US 0.07 ha-1 year-1 kg-1 N) was lower than the fertilizer cost (US 0.87 kg-1 N). A 5-fold increase in forage yields would be required to offset the cost of fertilizer. Fertilizer application did not increase forage production enough to be profitable for cattle production at present fertilizer and meat prices.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003752
    Scopus Count
    Collections
    Journal of Range Management, Volume 53, Number 4 (July 2000)

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