Calibration of CERES3 (Maize) to improve silking date prediction values for South Africa

Land Redistribution in South Africa : Progress to Date 1

This paper provides an overview of land reform in South Africa since the advent of democratic government in 1994, with a particular emphasis on land redistribution. It begins with a brief sketch of the historical background before outlining the main aspects and achievements of the land reform programme to date. The final sections of the paper briefly discuss some new policy proposals and the ke...

Prediction equations for spirometry in South Africa.

Prediction equations for spirometry in South Africa To the Editor: The South African Guideline for Office Spirometry was recently published. [1] Its aim was to provide an updated guideline for office spirometry in South Africa (SA), thereby improving the quality, standardisation and usefulness of spirometry. The need for local prediction equations based on large, all­inclusive studies of the SA...

Calibration Weighting to Compensate for Extreme Values, Non-response and Non-coverage in Labor Force Survey

Frame imperfection, non-response and unequal selection probabilities always affect survey results. In order to compensate for the effects of these problems, Devill and Särndal (1992) introduced a family of estimators called calibration estimators. In these estimators we look for weights that have minimum distance with design weights based on a distance function and satisfy calibration equa...

Monitoring the Environmental Impacts of GM Maize in South Africa

How effective and safe is Bt-maize in South Africa?

© 2011. The Authors. Licensee: AOSIS OpenJournals. This work is licensed under the Creative Commons Attribution License. The South African National Biodiversity Institute (SANBI) recently released the outcome of the South Africa–Norway bio-safety cooperation project ‘Monitoring the environmental impacts of GM maize in South Africa’. This project studied possible impacts of commercial geneticall...