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- Venter, AE [remove] 2
- 630 2
- Agronomy -- South Africa -- Periodicals 2
- Botany -- Environmental aspects -- Periodicals 2
- Plant-soil relationships -- Periodicals 2
- Plant-soil relationships -- South Africa -- Periodicals 2
- Soil science -- Periodicals 2
- Ambic 1 -- Bray 1 -- irrigated soils -- Mehlich 3 -- Olsen -- phosphorus extractants 1
- extraction methods -- irrigated soil -- phosphate reactions -- phosphorus requirements -- soil solution 1