Fontes e doses de adubação nitrogenada na atividade microbiana e fertilidade do solo cultivado com Brachiaria brizantha

Delbem, Flávia Cristina; Scabora, Márcia Helena; Filho, Cecílio Viega Soares; Heinrichs, Reges; Crociolli, Carlos Alberto; Cassiolato, Ana Maria Rodrigues

doi:10.4025/actasciagron.v33i2.3946

Cited by 12 publications

(8 citation statements)

References 11 publications

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“…However, Gatiboni et al (2011) emphasize that the total amount of crop residues may affect the microbial biomass as much as the C/N ratio of residues, once vetch, despite presenting a higher N concentration in its composition, decomposed rapidly, sustaining a smaller microbial biomass when compared to the residues of rye and oat. The soil microbial biomass and the addition of nitrogen to this system can speed up its decomposition of vetch, increasing N mineralization and reducing such immobilization, which are reflected in the lower values of SMB-N Soil microbial activity represented by soil basal respiration (SBR) was not influenced by the application of nitrogen in this study (Table 3), agreeing with the results of Delbem et al (2011) who did not find any differences in the C-CO 2 released from the soil under Brachiaria brizantha cv. Xaraés, subjected to different nitrogen sources and dosage.…”

Section: Groupsupporting

confidence: 80%

Biological and microbiological attributes in Oxisol managed with cover crops

Silva

Matsuoka

Bertollo

et al. 2017

SCA

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The inclusion of winter cover crops and fertilization with nitrogen to the soil can have an effect on their biological and microbiological attributes. The aim of this study was to evaluate biological and microbiological attributes in soil under different winter cover crops and nitrogen doses. The experiment was conducted at the Frederico Westphalen-RS campus of the Federal University of Santa Maria (UFSM) in a Rhodic Hapludox soil. The experimental design was a randomized block in factorial arrangement (2 x 10): 10 winter cover crops systems (Fallow [control], black oats, white oats, ryegrass, forage turnip, vetch, white lupine; black oat + forage turnip; black oat + vetch and black oat + vetch + fodder turnip), and two nitrogen rates in the form of urea applied in successive crops of beans common and maize, with four replications. We assessed the biological attributes (Margalef's richness, Simpson's dominance, Shannon's diversity and abundance of organisms) and microbiological (carbon and nitrogen microbial biomass, basal respiration, metabolic quotient and microbial quotient of the soil). The fallow with wild species and white lupine showed greater Simpson's dominance and abundance of organisms due to the increase in the number of individuals of the order Collembola. Vetch improved the biological attributes of the soil with increase in Collembola abundance and diversity of organisms of soil fauna. The application of nitrogen favored the microbial biomass carbon and reduced the metabolic quotient. Key words: Management. Soil fauna. Soil quality. ResumoA inclusão de plantas de cobertura de inverno e adubação com nitrogênio (N) ao solo pode exercer efeito nos seus atributos biológicos e microbiológicos. O objetivo deste trabalho foi avaliar atributos biológicos e microbiológicos em solo submetido a diferentes plantas de cobertura de inverno e doses de nitrogênio. O trabalho foi conduzido no campus de Frederico Westphalen, RS da Universidade Federal de Santa Maria de abril de 2010 a outubro de 2013 em Latossolo Vermelho distrófico típico. O delineamento experimental foi em blocos ao acaso em arranjo fatorial (10 x 2) sendo 10 sistemas de plantas de cobertura de inverno: Pousio (testemunha com espécies espontâneas); Aveia preta; Aveia branca; Azevém; Nabo forrageiro; Ervilhaca; Tremoço branco; Aveia preta + Nabo forrageiro; Aveia

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Section: Groupsupporting

confidence: 80%

Biological and microbiological attributes in Oxisol managed with cover crops

Silva

Matsuoka

Bertollo

et al. 2017

SCA

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“…Em razão da maior acidificação, observada nos tratamentos que receberam as maiores doses de fertilizantes, o Ca e o Mg, que normalmente ficam mais retidos ao complexo de troca, permaneceram livres na solução do solo com a diminuição das cargas negativas do solo dependentes de pH, e ficaram passíveis de serem lixiviados. Situação semelhante foi observada por Delbem et al (2011), porém com diminuição dos teores de Ca e Mg no solo, resultante da lixiviação, por causa dos baixos valores de pH.…”

Section: Resultsunclassified

Dinâmica de nutrientes na solução do solo em pomar fertirrigado de citros

Souza

Bôas

Quaggio

et al. 2012

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar a dinâmica de nutrientes na solução do solo após a aplicação, via fertirrigação, de nitrogênio, fósforo e potássio a laranjeiras. O experimento foi realizado entre setembro de 2007 e outubro de 2009, em pomares de laranjeiras 'Valência' e 'Hamlin', enxertadas sobre citrumeleiro 'Swingle'. Foram avaliadas cinco doses de N, P 2 O 5 e K 2 O (0, 25, 50, 100 e 200% da dose recomendada). A solução do solo foi extraída a 30 e 60 cm de profundidade, com o auxílio de extratores com cápsulas porosas. Foram realizadas 11 avaliações durante o período experimental, com as extrações iniciadas após 12 horas das fertirrigações. O aumento das doses reduziu o pH (pH~3,5, na maior dose), e aumentou a condutividade elétrica (CE~1,5 dS m -1 , na maior dose) e os teores de NH 4 , NO 3 , P, K, Mn e Zn na solução do solo, nas duas profundidades amostradas. Nos meses com maior precipitação pluvial, houve perda potencial de nutrientes por lixiviação, pois maiores concentrações de NO 3 , K e B foram observadas à profundidade de 60 cm. A análise da solução do solo, obtida por extratores com cápsula de cerâmica porosa, pode ser considerada ferramenta auxiliar para monitorar e avaliar a disponibilidade de nutrientes às plantas.Termos para indexação: Citrus sinensis, acidificação, cápsula porosa, extrator de solução, fertirrigação, lixiviação. Nutrient dynamics in soil solution in a fertigated citrus orchardAbstract -The objective of this work was to evaluate nutrient dynamics in soil solution after fertigated application of nitrogen, phosphorus, and potassium to orange trees. The experiment was carried out from September 2007 to October 2009, in 'Valência' and 'Hamlin' orange orchards grafted onto citrumelo 'Swingle' rootstock. Five doses of N, P 2 O 5 and K 2 O (0, 25, 50, 100 and 200% of the recommended dose) were evaluated. Soil solution was extracted from 30 and 60 cm soil depths using extractors with porous cups. Eleven evaluations were done during the experimental period, with extractions beginning 12 hours after fertigation. Increasing nutrient doses decreased pH (pH~3.5, at the highest dose), and increased electrical conductivity (CE~1.5 dS m -1 , at the highest dose) and the amounts of NH 4 , NO 3 , P, K, Mn, and Zn in the soil solution, in both sampled depths. In the months with heavier rainfall, there was nutrient potential losses by leaching, since higher concentrations of NO 3 , K, and B were observed at the 60 cm soil depth. Soil solution analysis, obtained by extractors with porous ceramic cups, can be considered an auxiliary tool for monitoring and assessing nutrient availability to plants.

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“…P and K. That reflects a strong relation between soil organic matter and microbial activity, showing the effect caused by the addition of P and K, and by the C:N ratio of the fertilizers added to the soil, which may have affected the results. The microbial biomass needs C to maintain its metabolic activities, and, when there is a greater increase of readily mineralizable N than C, the biomass suffers some type of stress (Delbem et al, 2011), which explains the form of grouping adopted for the assessed treatments.…”

Section: +3mentioning

confidence: 99%

Microbiological and chemical attributes of a Hapludalf soil with swine manure fertilization

Couto

Comin

Soares

et al. 2013

Pesq. agropec. bras.

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-The objective of this work was to evaluate the microbiological and chemical attributes of a soil with a seven-year history of urea and swine manure application. In the period from October 2008 to October 2009, soil samples were collected in the 0-10 cm layer and were subjected to the treatments: control, without application of urea or manure; and with the application of urea, pig slurry, and deep pig litter in two doses, in order to supply one or two times the recommended N doses for the maize (Zea mays)/black oat (Avena strigosa) crop succession. The carbon of the microbial biomass (MB-C) and the basal respiration (C-CO 2 ) were analyzed, and the metabolic (qCO 2 ) and microbial quotient (qmic) were calculated with the obtained data. Organic matter, pH in water, available P and K, and exchangeable Ca and Mg were also determined. The application of twice the dose of deep pig litter increases the MB-C and C-CO 2 values. The qmic and qCO 2 are little affected by the application of swine manure. The application of twice the dose of deep pig litter increases the values of pH in water and the contents of available P and of exchangeable Ca and Mg in the soil.

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Fontes e doses de adubação nitrogenada na atividade microbiana e fertilidade do solo cultivado com Brachiaria brizantha

Cited by 12 publications

References 11 publications

Biological and microbiological attributes in Oxisol managed with cover crops

Biological and microbiological attributes in Oxisol managed with cover crops

Dinâmica de nutrientes na solução do solo em pomar fertirrigado de citros

Microbiological and chemical attributes of a Hapludalf soil with swine manure fertilization

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