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- W4239046989 abstract "Nitrogen availability to plants from seafood waste composts must be determined for composting to be adopted as a means of seafood waste disposal and for utilization of the compost. In a 2-year study, the availability of N to silage corn in the year of application and the residual availability in the following year were evaluated under field conditions for four composts made from sawdust and seafood wastes. A broad range of compost rates was used to facilitate the study of the residual N availability. The composts were: HGF (groundfish waste with hemlock/fir sawdust); AGF (groundfish waste with alder sawdust); HCS (chitin sludge with hemlock/fir sawdust); and ACS (chitin sludge with alder sawdust). In the composts made with alder sawdust, the fraction of total N that was in inorganic form was smaller than that in the composts made with a hemlock/fir sawdust mixture. In the year of compost application, corn yields and N uptake were affected by the type of compost and rate of compost addition, and the rate effect varied with the compost type. The amount of inorganic N added in the composts was better than the organic N or C:N ratios of the composts at predicting corn yields and N uptake in the year of compost application. None of these compostrelated characteristics was closely correlated with residual N availability in the next year. The soil inorganic N concentration, which reflects the overall effect of composts and environmental conditions on N transformation, accounted for most of the variability in corn yield and N uptake during the 2-year period. Although the mineralization potential of the organic N fraction in the HGF was low in a laboratory incubation, a sizable reduction of total N and organic C concentrations in the soils amended with this or other composts under field conditions suggests that considerable mineralization during the subsequent year occurred in this region, which is characterized by mild temperatures and high rainfall in the winter. Because of the limited residual N availability of the HGF, AGF, or HCS, annual addition of the composts at low rates sufficient to sustain the soil productivity is more appropriate than less frequent addition at high rates." @default.
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- W4239046989 date "1995-08-01" @default.
- W4239046989 modified "2023-09-26" @default.
- W4239046989 title "MINERALIZATION AND PLANT AVAILABILITY OF NITROGEN IN SEAFOOD WASTE COMPOSTS IN SOIL" @default.
- W4239046989 doi "https://doi.org/10.1097/00010694-199516020-00006" @default.
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