The abundance of plant pests in the tropics, including weeds and disease, makes agriculture successful mainly in the plantation system, where needed control measures can be financed. The alternative is to move from deteriorated land to newer fields; this practice of shifting agriculture has also been common, because tropical soils lose their productive capacity so rapidly.
With a decline in fossil fuel supply (inevitable in the medium to long term) the attention will switch to renewable sources for on-farm fuel use and to renewable and/or nuclear for off-farm electricity generation. The renewable fuel that is most likely to be suitable for use in tractors and other self-propelled machines is esterified oil from oilseeds.

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The abundance of plant pests in the tropics, including weeds and disease, makes agriculture successful mainly in the plantation system, where needed control measures can be financed. The alternative is to move from deteriorated land to newer fields; this practice of shifting agriculture has also been common, because tropical soils lose their productive capacity so rapidly.
With a decline in fossil fuel supply (inevitable in the medium to long term) the attention will switch to renewable sources for on-farm fuel use and to renewable and/or nuclear for off-farm electricity generation. The renewable fuel that is most likely to be suitable for use in tractors and other self-propelled machines is esterified oil from oilseeds.

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