ISHS Acta Horticulturae 425: II International Pineapple Symposium
INFLUENCE OF THREE TYPES OF RAISED BED ON PINEAPPLE IN ACID-SULFATE SOILS OF THE MEKONG DELTA |
| Authors: | T. Nga, T. Meenvoort |
| Abstract:
In the Mekong Delta, most of the farmers make “lips” (banks) to cultivate pineapples on acid soils. There are 3 types of lip. Their construction techniques lead to differences in the distribution of some chemical parameters like Al, SO4 and Fe which affect the growth and yield of pineapples. The presence of Jarosite on top soil in the 1rst lip type is related to high concentrations of SO4 and Fe. In the 2nd lip type, in which Jarosite is deposited on both lip sides, SO4 and Fe are distributed along. In the 3rd lip type, organic matter is on the top, Al is higher than in the two other lip types. Iron occurred in highest concentration in the 1rst lip type as compared with the 2nd and 3rd ones. This presence is related to the organic matter. The loss of structure of the Jarosite results in an efficient leaching while organic matter retains ions, especially Aluminium of which the release and therefore the leaching are limited. EC was the highest in the 3rd lip type (1.827 mmhos cm-1) and the lowest in the 1rst one (1.32 mmhos cm-1). Where the amount of Jarosite was high, sulphate and iron were highest. Pineapple development was the best and therefore the yield was highest on the 1rst lip type in comparison with the two other types. | |
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