Soil fertility management

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Agrodok 2 Soil fertility management Laura van Schöll Rienke Nieuwenhuis © Agromisa Foundation, Wageningen, 2004. All rights reserved. No part of this book may be reproduced in any form, by print, photocopy, microfilm or any other means, without written permission from the publisher. First english edition: 1986 Third revised edition: 1998 Fourth edition: 2004 Authors: Laura van Schöll, Rienke Nieuwenhuis Illustrators: Barbera Oranje, Daniel van Buren Translation: Catharina de Kat-Reynen Print
  Agrodok 2 Soil fertility management Laura van SchöllRienke Nieuwenhuis   © Agromisa Foundation, Wageningen, 2004.  All rights reserved. No part of this book may be reproduced in any form, by print, photocopy,microfilm or any other means, without written permission from the publisher. First english edition: 1986Third revised edition: 1998Fourth edition: 2004Authors: Laura van Schöll, Rienke NieuwenhuisIllustrators: Barbera Oranje, Daniel van BurenTranslation: Catharina de Kat-ReynenPrinted by: Digigrafi, Wageningen, the NetherlandsISBN: 90-77073-03-5NUGI: 835    Foreword 3 Foreword Special thanks go first and foremost to Rob Leijder, Stephan Mantel,and Jan Vlaar for their invaluable comments. Further thanks go to theillustrators, Barbera van Oranje and Daniel van Buren.This Agrodok is a revised edition, which incorporates two previously published Agrodoks (Agrodok 2: ‘Soil Fertility’, and Agrodok 28:‘Green Manures’). These were combined because they can’t be dealtwith separately: green manures offer the small-scale farmer extra op- portunities to improve soil fertility. In addition to animal manure andchemical fertiliser, crop husbandry measures, such as the use of greenmanure, are important in combatting soil fertility problems.Agromisa publishes a whole series of Agrodoks. In addition to order-ing Agrodoks, you can correspond directly with Agromisa’s Questionand Answer Service to get advice about specific problems relating toagriculture.Rienke NieuwenhuisLaura van SchöllOctober 1998    Soil fertility management 4 Contents 1   Introduction 7   Part I: Soil fertility and crop husbandry 10   2   Introduction 10   2.1   Crop husbandry measures 10   2.2   Organic matter 11   2.3   Burning 12   2.4   Local conditions 13   3   Mulching 15   3.1   Advantages of mulching 15   3.2   Disadvantages and limitations of mulching 16   3.3   Method and recommendations 17   4   Green manuring 18   4.1   Advantages of green manures 18   4.2   Disadvantages and limitations of green manures 19   4.3   Method and recommendations 20   5   Intercropping 22   5.1   Advantages of intercropping 22   5.2   Disadvantages of intercropping 23   5.3   Method and recommendations 24   6   Green fallow periods 25   6.1   Advantages of fallow periods 25   6.2   Disadvantages 25   6.3   Method and recommendations for green fallow periods 26   7   Agroforestry 27   7.1   Advantages of agroforestry 27   7.2   Disadvantages and limitations of agroforestry 28  
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