Table 2: Crop yield response to fertilizer or soil fertility

Illinois Fertilizer Conference Proceedings
January 27-29, 1992

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Modified Analysis
Percent of years that the response was significant at the 0.10 level or higher
	73-82		83-87
	Corn	Soybean	Corn	Soybean
P Drawdown Comparison	0	43	0	25
N Rate study	88	29	100	0
K Rate study	25	29	20	20
N x P factorial
N (main)	88	29	40	0
P (main)	88	71	80	75
N x P	50	43	0	0
P x K factorial
P (main)	75	57	100	25
K (main)	62	57	80	75
P x K	12	43	20	25