Basically plants will always require fertilizer in certain amount as the nutrients for the growth and productivity of fruit. Thus ensuring adequate fertilizer as the nutrition for the palm trees are principles that should be sought for this business. In fact, to provide a sufficient number of that is costly, due to a variety of site-specific environmental factors such as palm oil is located. Fertilizer in general will be a lot of washed / leaching (50% in average) giving rise to much waste to the detriment of the economy. It can not be allowed to continue and need immediate solutions to overcome them.
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There are many scenarios that we can use for biochar application in palm oil plantations, among others enriched with chemical fertilizers (NPK), enriched with compost (and plus mulch), or adding a bacteria that contributes greatly to soil enrichment. If your palm oil industry have a concept for prioritizing environmentally friendly with the use of renewable energy, and energy efficiency, zero waste, sustainable and would like to play real to nourish the planet from global warming, then the application of biochar to "Carbon Farming" is the best solution.