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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 |
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