Correction of copper deficiency of oil palm on deep fibrous peat in Riau, Indonesia
2007
Goh, K.J. | Arif, S.
Copper (Cu) deficiency is common among young oil palms planted on deep fibrous peat in Riau, Indonesia. Many sources of Cu fertilizers are available but not all of them have been tested for their effectiveness in correcting Cu deficiency of oil palm. A 1-year trial was therefore conducted on three years old palms with the primary objectives to determine the optimal rates, types and methods of applying Cu fertilizer to correct Cu deficiency. Results showed all tested Cu fertilizers were capable of overcoming Cu deficiency of oil palm. However, Cu uptake by oil palm was higher than CuSO4. Application of CuSO4 gave similar results as Cu oxysulphate and fritted Cu in terms of Cu uptake by the oil palm. The leaf Cu concentration reached a peak about one month after applying CuSO4 but it took about three months when the less solube Cu oxysulphate and fritted Cu were applied. A second peak in leaf Cu concentration was detected at the ninth month with fritted Cu. Soil application of soluble Cu was more effective than foliar Cu spray in increasing Cu concentration.
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