Determination of the external phosphate requirements of two south african soils in a glasshouse pot experiment Report as inadecuate




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P.N.S. Mnkeni ; P. Muchaonyerwa ;Tropical and Subtropical Agroecosystems 2008, 8 (3)

Author: E.M. Gichangi

Source: http://www.redalyc.org/


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Tropical and Subtropical Agroecosystems E-ISSN: 1870-0462 ccastro@uady.mx Universidad Autónoma de Yucatán México Gichangi, E.M.; Mnkeni, P.N.S.; Muchaonyerwa, P. Determination of the external phosphate requirements of two south african soils in a glasshouse pot experiment Tropical and Subtropical Agroecosystems, vol.
8, núm.
3, 2008, pp.
243-250 Universidad Autónoma de Yucatán Mérida, Yucatán, México Available in: http:--www.redalyc.org-articulo.oa?id=93911235003 How to cite Complete issue More information about this article Journals homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative Tropical and Subtropical Agroecosystems, 8 (2008): 243 - 250 DETERMINATION OF THE EXTERNAL PHOSPHATE REQUIREMENTS OF TWO SOUTH AFRICAN SOILS IN A GLASSHOUSE POT EXPERIMENT Tropical and Subtropical [DETERMINACIÓN DE LA NECESIDAD DE FOSFATO DE DOS SUELOS SUDAFRICANOS EN UN EXPERIMENTO CON MACETA EN INVERNADERO] Agroecosystems E.M.
Gichangi*, P.N.S.
Mnkeni and P.
Muchaonyerwa Department of Agronomy, University of Fort Hare, PB X1314, Alice, 5700, South Africa.
E-mails: egichangi@ufh.ac.za *Corresponding author SUMMARY RESUMEN A glasshouse experiment was conducted to evaluate the external P requirement of two soils (Flagstaff and Qunu) from the Transkei region of South Africa with varying sorption properties using oat (Avena sativa L.) as a test crop.
Eight levels of P application estimated from the Langmuir equations that gave a range of P concentrations in the soil solution were evaluated.
The rates were 0, 45, 90, 135, 180, 225, 270, and 315 mg P kg-1 for Flagstaff soil and 0, 10, 20, 30 40, 50, 60, and 70 mg P kg-1 for Qunu soil and these resulted in equilibrium soil solution concentrations of between 0 to 0.35 mg P l-1 for both soils.
Harvesting was done 10 weeks after planting.
Biomass yield and tissue ...





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