Table 1
Cowpea variety and phosphate fertilizer dose (kg P₂O₅/ha) effects on crude protein (CP), neutral detergent fibre (NDF), acid detergent fibre (ADF) concentrations (g/kg) and In vitro gas production characteristics of haulms (g/kg)

Item	Za			So			He			IT			AS			SED	P -value
Item	30	60	90	30	60	90	30	60	90	30	60	90	30	60	90	SED	V	P rate	V x P rate
CP	153	166	149	138	129	133	146	140	143	145	126	126	145	150	145	6.3	0.001	0.119	0.044
NDF	478	481	462	489	545	554	503	508	460	491	512	507	480	518	533	20.3	0.001	0.032	0.020
ADF	293	282	290	320	348	352	350	341	302	317	306	303	308	310	322	15.4	0.001	0.031	0.038
DOM	436	442	425	416	430	416	419	438	420	443	433	426	418	404	411	5.0	0.001	0.087	0.290
B	192	174	191	188	193	172	188	195	193	191	194	189	184	173	177	6.0	0.217	0.405	0.310
C	0.07	0.07	0.06	0.06	0.07	0.07	0.06	0.07	0.07	0.07	0.06	0.06	0.06	0.06	0.07	1.0	0.855	0.410	0.740
IVGP 48 h (ml/g DM)	18.4	16.8	18.3	16.4	18.8	16.8	16.6	18.8	17.7	17.3	15.6	17.1	17.4	15.6	17.2	7.0	0.241	0.849	0.209