| De Klerk (1984a) |
Department of Agriculture annual surveys of costs of maize production (about 80 farms visited in Western Transvaal) |
1969-1977 and later years |
Supplies average cash wages of seasonal harvest workers and all-inclusive annual wages of permanent workers, set against the author's 1981 survey estimates. |
| De Klerk (1984a) |
Department of Agriculture time studies (labour-saving reorganisation of threshing) |
1960s |
Used to calculate the share of the seasonal employment decline due to reorganised hand-harvesting before combines. |
| De Klerk (1984b) |
Department of Agriculture postal records of 103 Western Transvaal maize farmers |
1981 |
Second comparator for average permanent wage (R1164 p.a.). |
| De Klerk (1984b) |
Department of Agriculture survey of the cost of maize production, 1981, Western Transvaal (Fenyes, Statistiese Bylae tot die Verslag oor die Benutting en Vergoeding van Plaasarbeid in die Suid-Afrikaanse Landbou, 1983, vols I and III) |
1977-78 to 1980-81 |
Benchmark for permanent wage levels, cash component, bonus and food values, against which the author's sample is shown to be biased upward. |
| De Klerk (1984c) |
Department of Agriculture estimates of average all-inclusive annual wage of permanent farm workers, 1970-1977 |
1970-1977 |
Series (R220 to R653) extended with the author's 1981 estimate (R1 777) to trace permanent worker wages. |
| De Klerk (1984c) |
Department of Agriculture time studies of threshing/harvesting labour |
1960s |
Basis for calculating the share of employment decline attributable to reorganisation of hand-harvesting. |
| De Klerk (1984c) |
Department of Agriculture wage data for seasonal maize-harvest workers, 1969-1976 |
1969-1976 |
Provides the benchmark average cash daily wage of seasonal workers (39 to 77 cents) against which the survey's 1981 wage is compared. |
| Van Zyl et al. (1987a) |
Maize production cost surveys, Department of Agriculture and Water Supply (rotation basis; ~80 random farmers each with >100 ha maize; NW Free State, Western Transvaal, Transvaal Highveld) |
1945-1985 |
Core dataset for farm-level labour use, remuneration, machinery investment, costs, income and productivity trends fitted with exponential growth curves. |
| Vink (2012) |
Annual Department of Agriculture surveys of production costs |
Apartheid era |
Described as the basis for setting the maize farm-gate price (cost plus margin); not analysed. |