Early impact of oil palm planting density on vegetative and oil yield variables in West Africa | OCL

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Table 3

Analysis of leaf contents in nitrogen, phosphorus, potassium, magnesium and chlorine (percentage of dry matter).

Treatment	Leaf nitrogen				Leaf phosphorus

	2009	2010	2011	2012	2009	2010	2011	2012

D 1	3.12	3.04	2.96 abc	3.01 ab	0.171	0.173	0.173	0.186
D 2	3.09	3.03	2.99 ab	3.07 a	0.169	0.170	0.172	0.185
D 3	3.12	3.06	3.02 a	3.02 ab	0.171	0.174	0.175	0.185
D 4	3.13	3.07	2.92 bc	3.00 abc	0.170	0.173	0.170	0.183
D 5	3.05	3.05	2.90 bc	2.92 c	0.168	0.172	0.171	0.182
D 6	3.06	3.04	2.88 c	2.95 bc	0.168	0.174	0.171	0.184
Mean	3.10	3.05	2.95	2.95	0.170	0.173	0.172	0.184
Threshold	ns	ns	< 0.05	< 0.01	ns	ns	ns	ns
LSD			0.09	0.07

Treatment	Leaf potassium				Leaf magnesium

	2009	2010	2011	2012	2009	2010	2011	2012

D 1	0.879	0.831	0.875	0.921	0.313	0.285	0.285	0.251
D 2	0.876	0.900	0.874	0.932	0.307	0.283	0.264	0.211
D 3	0.854	0.877	0.842	0.895	0.295	0.284	0.273	0.231
D 4	0.867	0.862	0.837	0.866	0.316	0.290	0.297	0.252
D 5	0.830	0.837	0.844	0.890	0.323	0.309	0.290	0.253
D 6	0.816	0.860	0.816	0.847	0.311	0.294	0.292	0.249
Mean	0.854	0.861	0.848	0.892	0.311	0.291	0.284	0.241
Threshold	ns	ns	ns	ns	ns	ns	ns	ns

Treatment	Leaf chlorine

	2009	2010	2011	2012

D 1	0.532	0.522	0.490	0.525
D 2	0.583	0.565	0.533	0.525
D 3	0.553	0.565	0.524	0.510
D 4	0.552	0.535	0.566	0.510
D 5	0.552	0.539	0.507	0.506
D 6	0.563	0.542	0.553	0.517
Mean	0.556	0.545	0.529	0.516
Threshold	ns	ns	ns	ns

NB 1: Threshold = threshold of statistical significance, as; not significant (ns) or significant under 5% probability of error (<0.05) or highly significant under 1% probability of error (<0.01%). NB 2: LSD = lowest significant difference under the 5% threshold. NB 3: a,b,c ...= classification of treatments according to the Duncan test at 5%.

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