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The Effect of Cattle Slurry Electroflotation Products as Fertilizers on Gaseous Emissions and Grassland Yield

^a Dep. of Plant Biology and Ecology, Univ. of the Basque Country, Apdo. 644. E-48080 Bilbao, Spain
^b Inst. of Agricultural Research and Development, NEIKER. B. Berreaga, 1. E-48160 Derio, Bizkaia, Spain
^c ADE Biotec S.L. Mikeletegi Pasealekua, 2. E-20009 Donostia, Gipuzkoa, Spain

View larger version (9K): [in this window] [in a new window]   Fig. 1. Ammonia volatilization rates measured during the first 44 h following treatments application in spring (experiment 1). () Control, (•) Untreated slurry, () Solid fraction, () Liquid fraction. The vertical bars indicate LSD between treatments for each sampling time (P < 0.05; n = 4).

View larger version (16K): [in this window] [in a new window]   Fig. 2. Nitrous oxide (A), nitric oxide (B), carbon dioxide (C) emission rates and water filled pore space (WFPS), and soil temperature (D) in spring (experiment 1). () Control, (•) Untreated slurry, () Solid fraction, () Liquid fraction, () soil temperature at 10 cm depth, () WFPS (0- to 10-cm depth). The vertical bars indicate LSD between treatments for each sampling day (P < 0.05; n = 4).

View larger version (20K): [in this window] [in a new window]   Fig. 3. Soil ammonium (A) and soil nitrate content (B) (0- to 10-cm depth). () Control, (•) Untreated slurry, () Solid fraction, () Liquid fraction. The vertical bars indicate LSD between treatments for each sampling time (P < 0.05; n = 4).

View larger version (23K): [in this window] [in a new window]   Fig. 4. Nitric oxide emission rates (A) and water filled pore space (WFPS) and soil temperature (B) in summer (experiment 2). () Control, (•) Untreated slurry, () Solid fraction, (•) Liquid fraction, () soil temperature at 10 cm depth, () WFPS (0- to 10-cm depth). The vertical bars indicate LSD between treatments for each sampling time (P < 0.05; n = 3).