ACID SULPHATE SOILS IN THE HUMID TROPICS: WATER MANAGEMENT AND SOIL FERTILITY

Summary and conclusion and recommendations. 1. Introduction/ R.J.Sevenhuijsen. 2. Water management aspects/ R.J.Sevenhuijsen. 2.1 Introduction. 2.2 Boundary conditions for water management. 2.3 Tidal fluctuation. 2.4 Conclusions. 3. Research sites/ R.J.Sevenhuijsen. 3.1 Site selection. 3.2 Description of the sites. 3.3 Soil and water conditions in transect between main drainage canals. 4. Water balances in the research sites/ R.A.L.Kselik. 4.1 The components of the water balance. 4.2 Water balance components in the four sites. 4.3 Conclusions. 5. Water management experiments with surface water/ R.A.L.Kselik. 5.1 Tabunganen. 5.2 Unit Tatas. 5.3 Waterlevels. 5.4 Puddling. 5.5 Conclusions. 6. Water management experiments with groundwater/ R.A.L.Kselik. 6.1 Shallow drainage systems. 6.2 Interceptor drain. 6.3 Groundwater barriers. 6.4 Conclusions. 7. Agronomic experiment/ K.W.Smilde. 7.1 Introduction. 7.2 Background of the experimental treatments. 7.3 Fertilizer uses and yield in monitoring fields. 7.4 Agronomic experiments in Tabunganen in 1989 and 1990. 7.5 Agronomic experiments Unit Tatas. 7.6 Conclusions. 8. Diseases, deficiency and toxicity symptoms/ R.A.L.Kselik. 8.1 Introduction. 8.2 Diseases. 8.3 Deficiency and toxicity symptoms. 8.4 Conclusion. 9. Supplementary groundwater surveys/ A.F.J.Hamming. 9.1 Introduction. 9.2 Methods and problems of the determination of the permeability. 9.3 Distribution permeability in Pulau Petak. 9.4 Conclusions. 10. Supplementary hydraulic surveys of surface and groundwater/ R.A.L.Kselik. 10.1 Introduction. 10.2 Model Banjar. 10.3 Modeling of water and acid movement in the Tatas canal systems. 10.4 Hydraulic model of the Unit Tatas test fields. 10.5 Conclusions. 11. Economic interpretation of test filed results/ R.J.Sevenhuijsen. 11.1 Introduction. 11.2 Economics analyses. 11.3 Alternative for traditional rice. 11.4 Conclusions.

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