Amelioration of soil acidity and the impact on the productivity of some highly weathered Fijian soils
1988
Morrison, R.J. | Naidu, Ravendra | Gangaiya, Philomena (University of the South Pacific, Suva (Fiji))
Fiji has extensive areas of acid soils with increasing proportions being brought into intensive cultivation each year. Relatively little work has been carried out on the fertility status of these soils or on the use of soil ameliorants on them. This paper reports the results of three studies in soil amelioration. In the first, locally available coral sand was tested as a liming material on a highly acid Typic Haplohumult in the field. The results showed that if the sand is ground to less than 60-mesh particle size (less than 0.25 mm) it is rapid and effective in decreasing soil acidity. In a second field study, the effect of lime, fertilizer, and poultry manure on maize growth and soil chemical properties of a Typic Haplohumult was investigated. The addition of lime alone more than doubled maize yields. The addition of fertilizers in the absence of lime also produced significant yield increases, while poultry manure was shown to be an effective alternative or additive to commercial fertilizers. The effect of liming could be related to changes in soil chemical properties through the influence on pH, KCl-extractable Al, Al-saturation percentage, and change in the ion-exchange and surface charge properties.
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