Abstract
No extensive investigation on the effect of fertilizers on Amazon cocoa variety (Theobroma cacao L.) has been performed in Nigeria. Therefore eight fertilizer treatments involving nitrogen and phosphorus, replicated six times at four locations across southern Nigeria, were established in 1973. The four N levels (N0, N1, N2, N3) involved were 0, 80, 160 and 240 kg ha−1 y−1, and the two P levels (P0, P1) were 0 and 67 kg ha−1 y−1. Results of the first 5 years of fertilizer application are reported. Response to P was observed at all locations, and the response was statistically significant at 2 of the locations. There was no response to the application of nitrogen. The data suggest, however, that there is only a response to phosphorus when nitrogen is applied.
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Ojeniyi, S., Egbe, N. & Omotoso, T. Effects of nitrogen and phosphorus fertilizers on unshaded Amazon cocoa in Nigeria. Fertilizer Research 3, 13–16 (1982). https://doi.org/10.1007/BF01063405
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DOI: https://doi.org/10.1007/BF01063405