Environmental Systems Research

Table 2 Cassava fertilization effect on pH (water), OC (%), TN (%) and AP (mg kg⁻¹) over the three different sampling periods after planting at α = 0.05

From: Soil fertility status of cassava fields treated by integrated application of manure and NPK fertilizer in Zambia

Organic manure					Mineral fertilizer
	pH	OC	TN	AP		pH	OC	TN	AP
4 MAP
O₀	5.27^a	1.13^a	0.058^a	36.63^a	M₀	5.68^a	1.26^b	0.066^a	43.07^a
O₁	5.55^ab	1.28^b	0.066^ab	63.61^ab	M₁	5.47^a	1.24^ab	0.067^a	58.24^ab
O₂	5.60^b	1.21^ab	0.066^ab	67.53^ab	M₂	5.50^a	1.15^a	0.061^a	71.04^ab
O₃	5.77^b	1.23^b	0.071^b	101.96^b	M₃	5.54^a	1.20^ab	0.067^a	97.39^b
F-value	6.7156	8.3069	4.9478	5.3507		1.2955	4.7104	1.6284	3.9428
p-value	0.004	0.0017	0.0139	0.0105		0.3123	0.0165	0.2249	0.0294
8 MAP
O₀	5.22^a	1.18^a	0.060^a	35.26^a	M₀	5.73^b	1.23^b	0.067^a	47.34^a
O₁	5.32^ab	1.20^a	0.064^a	50.96^b	M₁	5.42^ab	1.23^b	0.063^a	66.67^bc
O₂	5.57^bc	1.21^a	0.067^a	72.12^c	M₂	5.38^a	1.15^a	0.061^a	59.39^ab
O₃	5.75^c	1.23^a	0.067^a	90.00^d	M₃	5.32^a	1.21^ab	0.066^a	74.93^c
F-value	7.9466	1.2766	2.7402	47.700		4.6928	4.1016	1.8743	11.369
p-value	0.002	0.3183	0.0799	< 0.001		0.016	0.026	0.1773	< 0.001
12 MAP
O₀	5.09^a	1.14^a	0.061^a	42.49^a	M₀	5.86^b	1.28^c	0.074^b	69.97^a
O₁	5.41^b	1.25^b	0.070^b	65.36^a	M₁	5.41^a	1.25^bc	0.072^ab	92.52^a
O₂	5.71^c	1.21^ab	0.074^bc	107.77^b	M₂	5.43^a	1.15^a	0.068^a	85.33^a
O₃	5.94^d	1.25^b	0.077^c	155.79^c	M₃	5.45^a	1.17^ab	0.069^a	123.59^b
F-value	42.891	7.3924	32.26	46.829		14.276	9.8746	5.067	9.555
p-value	< 0.001	0.0029	< 0.001	< 0.001		< 0.001	< 0.001	0.0127	< 0.001

Means in the same column with the same letter are not significantly different. MAP months after planting. O₀ = control (without manure application), O₁ = 1.4 t ha⁻¹ chicken manure, O₂ = 2.8 t ha⁻¹ chicken manure, O₃ = 4.2 t ha⁻¹ chicken manure, M₀ = control (without mineral fertilizer), M₁ = 50N-11P-41.5 K kg ha⁻¹, M₂ = 100N-22P-83 K kg ha⁻¹, M₃ = 150N-33P-123.5 K kg ha⁻¹

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