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Table 1

 N and K rates applied and yield response (Mg FFB palm−1 yr−1) observed for each N and K level in the selected trials (AK01, BB03, SG01 and TG02 are located in Indonesia, PR01 in Nigeria, PS01 in Peru and TT08 in Ecuador). The yield associated with the optimum N or K rate appears in bold.

       Observed yield according to fertilizer level         
Trial YOP Nutrient Rate (kg palm−1 yr−1) Age (1) Age (2) 0 1 2 3 Pr > F
AK01 1978 N 0–0.46–0.92 6 13–16 18.44a 21.33a 23.66a   < 0.001
BB03 1974 N 0–0.69–1.38 4 12–15 23.73a 25.63a 26.12a   0.009
SG01 1975 N 0–0.69–1.38 3 12–15 32.02 33.85 33.51   0.535
TG02 1971 N 0–0.69–1.38 8 15–18 21.31a 25.28a 27.08a   0.001
TT08 1997 N 0–1.38 7 12–15 24.45 24.64     0.811
AK01 1978 K 0.7–1.4 6 13–16   20.81 21.48   0.302
BB03 1974 K 0–0.5–1 4 12–15 24.85 25.21 25.42   0.746
PR01 1997 K 0–0.75–1.5–2.25 3 15–18 15.30a 18.99a 19.62a 19.54a < 0.001
PS01 1983 K 0–0.75–1.5 5 12–15 20.77a 23.19a 23.30a   < 0.001
SG01 1975 K 0–0.75–1.5 3 12–15 31.67 34.99 32.72   0.203
TG02 1971 K 0–0.5-1 8 15–18 23.74 24.43 25.50   0.185
TT08 1997 K 0–0.75–1.5 4 12–15 24.07 25.04 24.53   0.605

YOP: year of planting. (1) Age since rates remained constant up to the end of the study period for yield. (2) Age for yield observations.

a

Not significantly different (P = 5%), according to the Tukey test.

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