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Organic food systems meeting the needs of Southern Africa.

Book cover for Organic food systems meeting the needs of Southern Africa.

Description

This book reports on long-term comparative organic farming systems' research trials carried out over the last 5 years in the Southern Cape of South Africa, as well as research into the successes and failures of the organic sector and the technical tools required for sustainable development in South Africa, Zambia, Uganda and Tanzania. It includes 24 chapters organized into 4 parts. Part 1 (Chapter...

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Chapter 18 (Page no: 233)

The Nelson Mandela long-term comparative organic farming systems research trials: baseline study and trial design.

The Nelson Mandela long-term comparative organic farming systems research trials (the Mandela Trials) were planned and established in 2014 with peer review from the three sites where organic comparative research has been ongoing for the past 20-30 years (Switzerland, Denmark and Pennsylvania in the USA). Organic and conventional farming systems, as well as monocrop and rotational vegetable production, were compared; crops grown were cabbage (monocrop and rotational), with sweet potatoes and cowpeas as the rotated crops. Owing to variation of soil fertility on the research trial site, an indicator crop (Caliente mustard (Brassica juncea)) was planted on the long-term research trial site before any treatments commenced, in order to quantify variation in soil fertility and plant growth. Variation between replications accounted for much of the variability, showing a fertility gradient across the site. Correlations were found in soils between soil pH and available soil P, and between available soil P and leaf P content in the crop. Replication 4 was found to have lower yields and soil fertility than the other three replications, especially plots 37, 38, 39 and 40, which were also found to have some building rubble below the 15 cm of topsoil. Soils were generally acidic and low in available soil P, due largely to high levels of exchangeable Al. It was decided that all plots would receive 1 t/ha of dolomitic lime each year for the first 3 years of the research trial, and that although all four replications would be measured and analysed, Replication 4 might produce atypical results, in which case results from this replication might have to be regarded as outliers in future analysis.

Other chapters from this book

Chapter: 1 (Page no: 3) The developing organic sector in Southern and Eastern Africa: what have we learned about sustainable development? Author(s): Auerbach, R.
Chapter: 2 (Page no: 21) An overview of global organic and regenerative agriculture movements. Author(s): Leu, A.
Chapter: 3 (Page no: 32) Organic research contributes to sector development and good organic policy: the Danish, Swiss, American and African case studies. Author(s): Auerbach, R.
Chapter: 4 (Page no: 42) The Organic Academy of IFOAM-Organics International: training multipliers in the developing world. Author(s): Hauptfleisch, K.
Chapter: 5 (Page no: 51) Understanding a food systems approach. Author(s): Strassner, C. Kahl, J.
Chapter: 6 (Page no: 60) BERAS - a global network of food systems with examples from Sweden, Haiti, Tanzania and India. Author(s): Hertwig, J.
Chapter: 7 (Page no: 81) The likely impact of the 2015-2018 drought in South Africa: lessons from the 2008 food price crisis and future implications. Author(s): Auerbach, R. Piek, H. Battersby, J. Devereux, S. Olivier, N.
Chapter: 8 (Page no: 100) The use of participatory rural appraisal (PRA) to support organic food systems in Africa. Author(s): Auerbach, R.
Chapter: 9 (Page no: 113) Strengthening participation in the organic value chain for small-scale farmers in Southern KwaZulu-Natal, South Africa. Author(s): Troosters, W. Auerbach, R. Haysom, G.
Chapter: 10 (Page no: 130) Participatory Guarantee Systems as an organic market entry point for small-scale farmers in South Africa. Author(s): Mashele, N. J. Auerbach, R.
Chapter: 11 (Page no: 139) Development of an inclusive value chain for peri-urban micro-farmers. Author(s): Purkis, M.
Chapter: 12 (Page no: 151) Supporting vulnerable communities in the Eastern Cape: assessing the rainfall evidence. Author(s): Auerbach, R.
Chapter: 13 (Page no: 176) Water efficiency, energy efficiency and suburban vegetable production. Author(s): Auerbach, R. Caude, A.
Chapter: 14 (Page no: 185) Experiential training of farmers and university diploma students in KwaZulu-Natal and the Southern Cape. Author(s): Auerbach, R.
Chapter: 15 (Page no: 199) The National Organic Agriculture Movement of Uganda. Author(s): Nalunga, J. Auerbach, R. Ssekyewa, C.
Chapter: 16 (Page no: 209) Factors contributing to adoption or disadoption of organic agriculture in Zambia. Author(s): Munthali, R. Auerbach, R. Mataa, M.
Chapter: 17 (Page no: 217) The rapid incineration field test as an accurate, cost-effective and practical tool for estimating soil carbon in Africa. Author(s): Ackhurst, A. Auerbach, R. Louw, J.
Chapter: 19 (Page no: 250) Comparative water use efficiency and water retention in the Mandela trials. Author(s): Eckert, C. Auerbach, R. Lorentz, S.
Chapter: 20 (Page no: 264) Biological and chemical soil fumigation and pest and disease management comparisons in the Western Cape. Author(s): Niekerk, A. van Auerbach, R. Lamprecht, S.
Chapter: 21 (Page no: 284) Initial assessment of selected biological soil health indicators in organic versus conventional cropping systems in field trials in South Africa. Author(s): Sibiya, M. Habig, J. Storey, S. Labuschagne, N.
Chapter: 22 (Page no: 303) Soil fertility changes and crop yields from the first 4 years of the Mandela trials. Author(s): Swanepoel, M. Auerbach, R. Mashele, N. J.
Chapter: 23 (Page no: 327) Urban agriculture: challenges and opportunities in urban water management and planning. Author(s): Wesselow, M. Kifunda, C. Auerbach, R. Siebenhüner, B.
Chapter: 24 (Page no: 337) A future strategy for organic development in Southern Africa. Author(s): Auerbach, R. Purkis, M.

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