Table 6.

The mean crop yield^a (t ha⁻¹) for the four liming treatments (control, Low, Medium and High) at Rothamsted 1962–1996.

Harvest year	Crop	Control	Low	Medium	High	SED
1962b	Spring beans	1.54	2.01	2.55	2.33	–
1963	Spring beans	1.34	2.59	2.89	2.82	0.458
1964	Spring beans	1.85	2.38	2.48	2.15	0.223
1965	Spring barley	3.25	5.25	5.24	5.18	0.545
1966	Spring barley	2.73	4.41	4.77	4.80	0.411
1967	Spring barley	1.44	4.33	4.22	3.87	0.449
1968	Potatoes	23.07	26.07	26.82	24.95	2.488
1969	Fallow	–	–	–	–	–
1970	Spring barley	0.31d	2.87	3.64	3.58	0.265
1971	Spring barley	0.67d	3.54	4.34	4.53	0.406
1972	Spring barley	0.00c	3.67	4.55	4.90	0.484
1973	Spring barley	0.00c	3.24	4.07	4.57	0.394
1974	Potatoes	23.2	31.7	34.2	34.3	4.182
1975	Spring oats	1.85	2.42	2.86	2.80	0.204
1976c	Spring oilseed rape	–	–	–	–	–
1977	Spring oats	3.26	3.47	3.77	3.58	0.232
1978	Spring barley	0.19d	2.33e	4.01	4.20	0.502
1979	Fallow	–	–	–	–	–
1980	Fallow	–	–	–	–	–
1981	Spring oats	3.34	3.56	3.54	3.08	0.139
1982	Spring oats	1.42	1.48	1.31	1.38	0.090
1983	Potatoes	23.83	29.51	30.03	28.84	0.994
1984	Fallow	–	–	–	–	–
1985	Spring barley	0.00c	6.07	7.51	7.77	0.356
1986	Winter Triticale	6.24	8.00	8.27	8.20	0.245
1987	Spring lupins	1.82	2.80	2.87	3.10	0.233
1988	Linseed	0.00c	2.69	2.77	2.66	0.118
1989	Spring beans	0.06d	0.90	1.04	1.40	0.185
1990	Spring beans	0.12d	1.91	2.57	3.04	0.178
1991	Winter oilseed rape	1.39	2.38	2.12	2.56	0.894
1992c	Winter oilseed rape	–	–	–	–	–
1993	Winter lupins	0.38d	2.19	1.61	1.41	0.2200
1994c	Winter lupins	–	–	–	–	–
1995	Winter wheat	0.73d	6.81	7.76	7.84	0.492
1996	Winter wheat	2.74d	8.30	8.79	8.63	0.846

^aAll grain yield (including lupins) has been standardised to 85% dry matter, oilseeds to 90% dry matter and potato yield is fresh weight.

^bTreatment mean data only, no plot level data available.

^cCrop failure.

^dSome plots failed for this treatment.