2008
DOI: 10.1080/02571862.2008.10639889
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The lower and upper threshold values, biological optimum and mineralization of nitrogen in the main maize producing soils of South Africa

Abstract: There is still no consensus in South Africa on the parameters used to advise maize farmers on the quantity of N needed for optimum yields. In order to determine the lower and upper threshold values for nitrogen (N), the biological optimum and the mineralization of organic N in the main maize growing areas of South Africa, field trials were carried out at seven localities over three years. The treatments were full fertilization as reference (Ref), with the comparative treatment being where N was omitted (0N). R… Show more

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Cited by 8 publications
(2 citation statements)
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References 21 publications
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“…At Potchefstroom the pH of the soil was 6.61, almost similar to the threshold value. Compared to the upper inorganic N threshold concentration established by Van Biljon et al (2008), the soils' inorganic N concentrations were very low. The Bray 1 extractable P concentration at Ottosdal (16 mg•kg −1 ) was slightly lower and at Potchefstroom (56 mg•kg −1 ) much higher than the 20 mg•kg −1 the FSSA (2007) recommended, and at Bothaville more or less similar to the threshold.…”
Section: Soil Fertility Statuscontrasting
confidence: 56%
“…At Potchefstroom the pH of the soil was 6.61, almost similar to the threshold value. Compared to the upper inorganic N threshold concentration established by Van Biljon et al (2008), the soils' inorganic N concentrations were very low. The Bray 1 extractable P concentration at Ottosdal (16 mg•kg −1 ) was slightly lower and at Potchefstroom (56 mg•kg −1 ) much higher than the 20 mg•kg −1 the FSSA (2007) recommended, and at Bothaville more or less similar to the threshold.…”
Section: Soil Fertility Statuscontrasting
confidence: 56%
“…Soil testing, may provide information on the limiting nutrients. Often, low soil test values signify a positive crop response to fertilizer application [30,31]. Soil test values need to be calibrated to crop response before they can be interpreted accurately [32], but the lack of data to calibrate soil tests is a major setback in many developing countries [33,34].…”
Section: Introductionmentioning
confidence: 99%