Table 1.

The fertilizer and manure treatments applied annually to the Broadbalk experiment plots used in the simulations.

Treatments
Plot	Up to 1967	1968–1984	1985–2000	2001–2004	2005–2012
3	Nil	Nil	Nil	Nil	Nil
5	P K Na Mg	P K Na Mg	P K Mg	K Mg	K Mg
6	48 N P K Na Mg	48 N P K Na Mg	48 N P K Mg	48 N K Mg	48 N K Mg
7	96 N P K Na Mg	96 N P K Na Mg	96 N P K Mg	96 N K Mg	96 N K Mg
8	144 N P K Na Mg	144 N P K Na Mg	144 N P K Mg	144 N K Mg	144 N K Mg
9	48 N* P K Na Mg	192 N P K Na Mg	192 N P K Mg	192 N K Mg	192 N K Mg
15	96 N P K Na Mg	144 N P K Na Mg	240 N P K Mg	240 N K Mg	240 N K Mg
16	96 N* P K Na Mg	96 N P K Na Mg	288 N P K Mg	288 N K Mg	288 N K Mg
2.1	FYM since 1885	FYM 96 N	FYM 96 N	FYM 96 N	FYM 144 N
2.2	FYM	FYM	FYM	FYM	FYM