Agronomic Value of Alkaline-Stabilized Sewage Biosolids for Spring Barley
Peter Christiea,
D.Lindsay Eassonb,
Jane R. Pictonc and
Stanley C.P. Loved
a Agric. and Environ. Sci. Division, Dep. of Agric. and Rural Dev. for N. Ireland, Newforge Lane, Belfast, United Kingdom BT9 5PX
b N. Ireland Agric. Res. Inst., Large Park, Hillsborough, United Kingdom BT26 6DR
c Greenmount College of Agric. and Hortic., Antrim, United Kingdom BT41 4PU
d N. Ireland Water Serv., 39 Slaght Road, Ballymena, United Kingdom BT42 2JE. Research supported by the Dep. of Agric. and Rural Dev. for N. Ireland and N. Ireland Water Serv

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Fig. 2 Mean annual grain-response curves to increasing application rate of fertilizer and biosolid P at the Antrim site
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Fig. 3 Mean annual grain-response curves to increasing application rate of fertilizer and biosolid K at the Hillsborough site
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Fig. 4 Calculated mean annual P balance (inputs from fertilizer or biosolids - outputs in grain and straw) plotted against mean soil Olsen P at Antrim. . Diamond, control; squares, fertilizer; triangles, biosolids
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Fig. 5 Calculated mean annual K balance (inputs from fertilizer or biosolids - outputs in grain and straw) plotted against mean soil exchangeable K at Hillsborough. . Diamond, control; squares, fertilizer; triangles, biosolids
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Copyright © 2001 by the American Society of Agronomy.