Precision agriculture in oil palm plantations: diagnostic tools for sustainable N and K nutrient supply | OCL

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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	18.44^a	21.33^a	23.66^a		< 0.001
BB03	1974	N	0–0.69–1.38	4	12–15	23.73^a	25.63^a	26.12^a		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	21.31^a	25.28^a	27.08^a		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	15.30^a	18.99^a	19.62^a	19.54^a	< 0.001
PS01	1983	K	0–0.75–1.5	5	12–15	20.77^a	23.19^a	23.30^a		< 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.

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

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