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The value of residues from long-period manuring at Rothamsted and Woburn IV The value to arable crops of residues accumulated from superphosphate

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Figure

Table increased that, at Rothamsted, yields without I shows ll of barley grain on starved soilsnew P were small, l2 to 16 cwt/acre, and 50lb/acre of new Pthem by to 12 cwt/acre
Table 2 shows the residues increased and yields on starved and enriched soils without new P;yields of barley grain by 9 to 15 cM/acre at Rothamsted5 to 7 cwt at Wobum.
Fig. i soilslOnly shows the response curves to new P on both starved and enrichedon the Exhiustion Land can the P residues be valued in terms of
Table 2 shows the yields on the Exhaustion Land 1959-60, and at Woburn h 1960-62.Potatoes on all sites and in all years
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