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In the silt and loam, the ammonium N fraction in digestates had a fertilizer replacement value equal to that of mineral fertilizer N, whereas the replacement value was higher in the nutrient poor sandy soil.
The mineral N fertilizer replacement value is the ratio between the grain yield obtained in the digestates or manure treatments (treatments 3 8) and the grain yield obtained in the mineral N fertilizer treatment.
This study was aimed at evaluating the impact of widely different feedstocks for biogas production on the mineral N fertilizer replacement values of the resulting digestates, as well as the P and K supply to grain crops and potential losses through leaching.
Figure 1 shows that in the silt and loam, the nitrogen fertilizer replacement value (NFRV) (Webb et al. 2013) for manure and digestates is approximately 1, when based on the NH4+ concentration measured in the fresh samples of the digestates (Table 1).
Similar(56)
Overall, this work contributes to the understanding of both mixed-species and single-species bioinoculants which are increasingly being looked towards as chemical fertilizer replacements.
Fertilizer: Fertilize "weakly, weekly".
On the other hand, as a component of sustainability, replacement of chemical fertilizers by bio-fertilizers has the potential to lower costs for farmers, to increase yields, and to mitigate greenhouse-gas emissions and pollution of water and soil.
To look after all the trees O'Shea has been receiving only $29,000 a year, for fertilizers, supplies, and replacements, which is almost nothing.
Excreta from the family latrine are not only valuable as fertilizer, as reflected in its replacement value by a commercial fertilizer.
Full replacement of N fertilizers for grasses by A. brasilense may not be feasible, because of the modest contribution of biological nitrogen fixation by the bacterium.
Partial or total replacement of chemical fertilizers with PGPB may not only reduce costs, but also help to mitigate the negative environmental impacts of agricultural activities.
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