Table 5.

The significance level (P value)^a for the lime, P and K treatment effects for crop yield in each harvested year of the long-term liming experiment at Rothamsted and Woburn 1962–1996.

Harvest year	Crop	Rothamsted Lime	P	Kb	Woburn Lime	P	Kb
1963	Spring beans	<0.001	ns	<0.001	0.005	ns	<0.001
1964	Spring beans	ns	ns	0.028	<0.001	0.044	<0.001
1965	Spring barley	0.005	ns	ns	<0.001	<0.001	ns
1966	Spring barley	<0.001	ns	ns	<0.001	<0.001	ns
1967	Spring barley	<0.001	0.001	ns	0.004	<0.001	0.028
1968	Potatoes	ns	0.003	<0.001	ns	<0.001	<0.001
1970	Spring barley	<0.001	0.026	ns	<0.001	<0.001	0.003
1971	Spring barley	<0.001	0.004	ns	<0.001	<0.001	<0.001
1972	Spring barley	<0.001	0.005	ns	<0.001	0.006	<0.001
1973	Spring barley	<0.001	<0.001	ns	0.004	<0.001	ns
1974	Potatoes	ns	<0.001	<0.001	<0.001	<0.001	<0.001
1975	Spring oats	<0.001	<0.001	ns	<0.001	ns	ns
1977	Spring oats	ns	<0.001	ns	0.002	<0.001	ns
1978	Spring barley	<0.001	0.005	ns	<0.001	ns	0.002
1981	Spring oats	0.013	ns	–	ns	ns	–
1982	Spring oats	ns	0.004	–	ns	0.002	–
1983	Potatoes	<0.001	<0.001	–	<0.001	<0.001	–
1985	Spring barley	<0.001	<0.001	–	<0.001	0.002	–
1986	Winter Triticale	<0.001	<0.001	–	ns	0.049	–
1987	Spring lupins	<0.001	<0.001	–	0.016	0.003	–
1988	Linseed	<0.001	ns	–	<0.001	0.022	–
1989	Spring beans	<0.001	ns	–	<0.001	ns	–
1990c	Spring beans	<0.001	0.017	–	–	–	–
1991	Winter OSR	ns	ns	–	<0.001	0.011	–
1993c	Winter lupins	<0.001	ns	–	–	–	–
1995	Winter wheat	<0.001	0.041	–	<0.001	0.028	–
1996	Winter wheat	<0.001	ns	–	<0.001	ns	–

^ans indicates a P value > 0.05.

^bFrom 1981 onwards there was no K main plot treatment.

^cCrop failure at Woburn only.