Biosolids effectiveness to yield ryegrass based on their nitrogen content

Scientia Agricola

Rodrigo Studart Corrêa²  Robert E. White¹  Anthony J. Weatherley¹ 

[1] ,Universidade de Brasília Depto. de Engenharia Florestal Brasília DF ,Brasil

关键词: Lolium perenne L.;    Mitscherlich;    sewage sludge;    biosolids;    agronomic efficiency;    Lolium perenne L.;    Mitscherlich;    lodo de esgoto;    biossólidos;    eficiência agronômica;   

DOI  :  10.1590/S0103-90162005000300011

来源: SciELO

【 摘 要 】

Biosolids have been reported to increase yields and supply plant nutrients. However, complying with health and environmental standards is necessary before applying biosolids to land. Thus, sludge stabilization is required to make biosolids safe enough for their agricultural use. Side effects of stabilization processes on agronomic features of sewage sludge are not quite known, although their understanding is essential for biosolids management. Based on a model equivalent to the Mitscherlich equation, effects of the most common processes for sludge stabilization were evaluated (composting, liming, heat-drying and solar irradiation) in relation to the agronomic effectiveness of biosolids to yield Lolium perenne L. on two tropical soils, with NH4H2PO4 as a reference. Sewage stabilization processes have affected the ability of biosolids to promote plant growth. Their effectiveness was usually higher than fertilizer in a Spodosol and lower in an Oxisol. Solar-irradiated sludge presented the highest effectiveness among the biosolids and reached peak yields at the lowest application rate independent on soil type. Biosolids could efficiently substitute fertilizers and even yield more plant dry matter than the NH4H2PO4 reference, depending on the biosolid and soil type.

【 授权许可】

CC BY   
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