by A. van Wambeke
FAO SOILS BULLETIN 23
FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED
NATIONS
Rome 1974
The designations employed and the presentation of material in
this publication do not imply the expression of any opinion whatsoever on the
part of the Food and Agriculture Organization of the United Nations concerning
the legal status of any country, territory, city or area or of its authorities,
or concerning the delimitation of its frontiers or boundaries. |
M-53
ISBN 92-5-100754-3
The copyright in this book is vested in the Food and Agriculture Organization of the United Nations. The book may not be reproduced, in whole or in part, by any method or process, without written permission from the copyright holder. Applications for such permission, with a statement of the purpose and extent of the reproduction desired, should be addressed to the Director, Publications Division, Food and Agriculture Organization of the United Nations, Via delle Terme di Caracalla, 00100 Rome, Italy.
© FAO 1979
Cover photograph: Humid tropical forest on
ferralsols.
(FAO photo)
This electronic document has been scanned using optical character recognition (OCR) software and careful manual recorrection. Even if the quality of digitalisation is high, the FAO declines all responsibility for any discrepancies that may exist between the present document and its original printed version.
1.1.1 Differentiating characteristics and definition
1.1.2 Modal concept
1.1.3 Accidental characteristics1.2 Related geographic distribution
1.3.1 Main subdivisions
1.3.2 Correlation with order classifications
1.3.3 Description and analysis of typical profiles
PART 2 MANAGEMENT PROPERTIES OF FERRALSOLS
2.1.2 Soil water relationships
i. Permanent wilting point
ii. Field capacity
iii. Available water
iv. Infiltration, water movement2.2 Physico-chemical properties
2.3.1 Nitrogen and organic matter levels
i. Nitrogen and organic matter levels
ii. Organic matter changes and nitrogen supplyi. Forms of phosphorus
ii. Phosphorus adsorption, fixation and residual effects2.3.3 Potassium
2.3.4 Calcium, aluminum, pH and limingi. Calcium deficiencies
ii. Exchangeable aluminum, aluminum in solution
iii. pH and liming2.3.5 Sulphur and minor elements
3.1 Tillage practices for seedbed-rootbed preparation
3.2 Fallows3.2.1 Restoration of chemical fertility
i. Fallows in rainforest regions
ii. Fallows in savanna regions
iii. Fallows in cool tropical regions3.2.2 Restoration of physical properties
3.2.3 Soil and water conservation by fallows3.3 Fertilizer and lime requirements
3.3.1 Nitrogen fertilization (BARTHOLOMEW, 1972)
i. Crop use requirements (NM)
ii. Natural supply of nitrogen (NS)
iii. Use efficiency of fertilizers3.3.2 Phosphorus fertilization
3.3.3 Potassium fertilization
3.3.4 Lime requirements