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The Rothamsted long-term experiments: are they still relevant?

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Figure

Fig. |. 40 kg Broadbalk. Yields of winter wheat, I 852-1 986: unmanured;inorganics (ltAkgN hrl, 35 kg P hrl,90 kg K hrl annually);farmyard manure (35 t ha-t annually, containing c.225 kgN ha-I,P hrl, 210 kg K ha-r) (Jenkinson l99l ).
Fig. 2. Total carbon cm. in topsoil, 0-23(a) Hoosfield, Rothamsted,
Table l. Yields of winter wheat grain (t ha-l) given by fertilizers, farmyard manure and farmyard manure plus fertilizer N, Broadbalk" Rothamsted
Fig. 5. Broadbalk. Yields of two cultivars of winter wheat,Cappelle Desprez 1969-1978 (Fig
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