Abstract
The effect of various combinations of N, P, K and Mg fertilizer on yield of rubber over a 3 year period is discussed.
N, K and Mg increased yield consistently over the period. The average annual increase in yield over control as a result of application of N, K and Mg were 11%, 3% and 9% respectively; where the effect of P was positive it was negligible.
Combined applications of N, K and Mg produced increases that were higher than when they were applied individually. The N1 K2 combination produced a mean annual increase of 18% over N0 K0, while N1 Mg1 increased yield by an average of 26% annually over N0 Mg0.
N, K and Mg are thus considered as generally required by the rubber trees.
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References
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Onuwaje, O. Yield response of rubber (Hevea brasiliensis) to fertilizers on an Ultisol in Nigeria. Fertilizer Research 4, 357–360 (1983). https://doi.org/10.1007/BF01054008
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DOI: https://doi.org/10.1007/BF01054008