Interaction between organic residues and nitrogen fertilizing at the cultive of Urochloa brizantha cv. Marandu and at the soil attributes

Submitted by Ivy Rodrigues (ivy@unoeste.br) on 2022-05-19T12:47:34Z No. of bitstreams: 2 JANARDELLY G. DE SOUZA.pdf: 6521982 bytes, checksum: 1362d7a76fe424af72c923123f38279f (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Made available in DSpace on 2022-05-19T12:47:34Z (GMT). No. of bitstreams: 2 JANARDELLY G. DE SOUZA.pdf: 6521982 bytes, checksum: 1362d7a76fe424af72c923123f38279f (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2021-09-28 Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES The biosolid is a residue generated during the treatment of wastewater at the Sewage Treatment Station (ETE), it is rich in organic matter and nutrientes, but there are limitations to its use. A viable alternative for using this residue is its transformation into biochar through pyrolysis, associating the inherent benefits to biochar, eliminating the presence of pathogens wich is one of the main limitations for its application. Therefore, this study aimed to evaluate whether applications of organic residues and biochars individual or combined with nitrogen fertilization interfere in the soil attributes and in the development of Urochloa brizantha cv. Marandu. Thus, in a first stage, biochars was produced from a dry biosolids sample and a dry sugarcane bagasse sample, separately, through slow pyrolysis at a temperature of 350°C, wich where characterized through physical analysis, chemical and mass balance. In a second stage, a experimente was installed in a completely randomized design (DIC), with a 7x4 factorial scheme and 5 repetitions, and the treatments consisted of 7 substrate compositions namely: control soil (SC); soil + 300 g of pure biosolid (BP); soil + 100 g pure sugarcane bagasse (BCP); soil + 150 g pure biosolid + 50 g pure sugarcane bagasse (BP+BCP); soil + biosolid biochar (BB); soil + 100 g sugarcane bagasse biochar (BBC); soil + 150 g biosolid biochar + 50 g sugarcane bagasse biochar (BB+BBC); and 4 doses of mineral nitrogen fertilization: 0; 12,5; 25 and 50 mg dm-3. In all, 4 cuts were made in the plants at 60, 88, 116 and 144 days after planting. The development of Marandu grass was evatuated through physiological variables: leaf mass production, root mass production, total nitrogen content and organic carbono in plant tissues. As for the soil, the chemical and microbiological atributes were evaluates after the cultivation of Marandu grass. For this, chemical analyzes (determination of pH, organic matter, phosphorus, potassium, magnesium, calcium, aluminium and hydrogen plus aluminium, N-total, N-inorganic and total organic carbon) and biological (basal soil respiration, microbial biomass carbon and nitrogen, dehydrogenase enzyme activity and fluorescein diacetate hydrolysis). The data obtained in the experiment were submitted to analysis of variance using the SISVAR program. For comparison of means, the Scott-Knott test at 5% probability was used (p