Table 1. Corn yields as affected by tillage, fertilizer rate, and plant population in continuous corn at ten Illinois sites. Differences between main effects are shown (in bold) only if significant at the 10% level. For interactions, significance is shown at the 5 or 10% level by ** and *, respectively.

Illinois Fertilizer Conference Proceedings
January 26-28, 2006

Table 1. Corn yields as affected by tillage, fertilizer rate, and plant population in continuous corn at ten Illinois sites. Differences between main effects are shown (in bold) only if significant at the 10% level. For interactions, significance is shown at the 5 or 10% level by ** and *, respectively.

Tillage	Fertilizer	Plant pop.	03	03	04	04	04	05	05	05	05	05	10 SY
Tillage	Fertilizer	Plant pop.	UR	MN	OR	UR	MN	OR	URa	URb	MN	DK	Avg
bushels per acre

Chisel			242	177	222	237	185	177	131	198	90	205	187
Deep			240	182	227	241	217	164	128	192	114	214	192
Tillage, deep - chisel							32				24		5

	Normal		230	176	221	230	195	165	122	195	98	211	184
	High		252	183	228	248	208	175	137	196	105	208	194
Fertilizer, high - normal			21		8	18	13	10					10

		Normal	245	187	223		207	166	132	199	109	210	186
		High	237	172	226		196	175	127	191	95	209	181
Population, high - normal			-8	-16			-11	9		-8	-13		-6

Chisel	Normal		233	172	219	232	178	165	125	198	87	206	182
Chisel	High		252	182	225	241	192	188	137	199	93	204	191
Deep	Normal		228	179	222	228	211	166	119	192	110	216	187
Deep	High		252	185	231	255	223	161	137	192	118	213	197
Tillage x fertilizer								**

Chisel		Normal	250	189	223		194	174	134	199	96	202	185
Chisel		High	235	166	221		176	180	128	197	84	209	177
Deep		Normal	240	186	223		219	157	130	200	121	218	188
Deep		High	239	178	230		215	170	126	185	106	210	184
Tillage x population			*	**						*		**

	Normal	Normal	236	185	220		202	166	128	203	110	210	184
	Normal	High	225	167	222		187	164	116	186	87	212	174
	High	Normal	254	190	227		212	165	136	195	108	210	188
	High	High	249	176	230		204	185	138	196	103	207	188
Fertilizer x population								**		**	*

Site average yield			241	179	224	238	200	170	129	195	101	209

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