Decomposição e liberação de nutrientes da parte aérea de plantas de milheto e sorgo

Teixeira, M.B.; Loss, Arcângelo; Pereira, Marcos Gervásio; Pimentel, Carlos

doi:10.1590/s0100-06832011000300021

Cited by 26 publications

(33 citation statements)

References 19 publications

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“…A dessecação aos 15 DAS+RF resultou num menor valor de N na planta de arroz no estádio fenológico V 3 , para o ano agrícola de 2010/11, evidenciando uma redução de 11% em relação ao tratamento pousio. Esse comportamento pode ser atribuído à maior relação C/N nos resíduos vegetais do azevém em função da maior proporção de colmos nos estádios fenológicos mais adiantados (TEIXEIRA et al, 2011), diminuindo, assim, a velocidade de decomposição dos resíduos vegetais aos 15 DAS+RF, quando comparado aos demais tratamentos.…”

Section: Resultsunclassified

Manejo do azevém no estabelecimento inicial de plantas, na ciclagem de nutrientes e no rendimento de grãos do arroz irrigado

et al. 2015

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RESUMO O objetivo deste trabalho foi avaliar o efeito de diferentes manejos da cultura do azevém na entressafra do arroz irrigado, sobre o estabelecimento inicial de plantas, a ciclagem de nutrientes e o rendimento de grãos de arroz. O experimento Use of ryegrass in lowlands intensifies the nutrient cycling; however, it is recommended that in non grazed ryegrass the desiccation should be performed 60 days before the irrigated rice planting without reducing grain yield. Ryegrass hay production is a viable alternative for the off-season in lowlands because it does not reduce the initial establishment of irrigated rice plant.Key words: Oryza sativa, crops succession, cover crop, hay production. INTRODUÇÃOO sistema de semeadura direta em áreas de várzea pode ser incrementado através da implantação de plantas de cobertura de solo após a colheita do arroz irrigado (Oryza sativa). Essa prática pode incrementar a renda do produtor rural, através da utilização de uma cultura forrageira para produção de feno ou para pastejo. Além disso, esse sistema pode impactar positivamente na sustentabilidade do sistema de produção, em razão da ciclagem de nutrientes oriundos da palha remanescente do arroz irrigado pela cultura sucessora, o que possibilitaria otimizar o uso desses nutrientes e minimizar as suas perdas para o ambiente.Desse modo, quando se utilizam culturas em sucessão, busca-se, além da ciclagem de nutrientes, o sincronismo entre a liberação destes pela planta de cobertura e a absorção pela cultura sucessora. Nesse sentido, considera-se uma condição ideal

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Section: Resultsunclassified

Manejo do azevém no estabelecimento inicial de plantas, na ciclagem de nutrientes e no rendimento de grãos do arroz irrigado

et al. 2015

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“…In addition, the increase in air temperature, and consequently in soil temperature, as well as rainfall, that occurred during the experiment may have contributed to increase breakdown of residues by microorganisms (Figures 1a and 1b) (Teixeira et al, 2011(Teixeira et al, , 2012 (-kt) ) to the values of remaining dry matter (DM), total organic carbon (TOC), lignin (Lig), cellulose (Cel), non-structural biomass (Bio), nitrogen (N), phosphorus (P), potassium (K), calcium (Ca) and magnesium (Mg); decomposition constant (k); and half-life (t ½ ) of each compartment and R 2 values for the residues of weeds (WD), black oat (BO), rye (RY), oilseed radish (RD), oilseed radish + black oat (RD + BO), and oilseed radish + rye (RD + RY) deposited on the onion row Rev Bras Cienc Solo 2016;40:e0150099 ) and C/N ratio value (22), and its low Cel/Lig ratios (3) ( Table 1). Residues with high levels of lignin, and consequently higher Lig/N ratio values and lower Cel/Lig values, have slower decomposition, since lignin protects cell wall cellulose from microbial degradation (Berg and McClaugherty, 2008).…”

Section: Residue Decomposition and Nutrient Releasementioning

confidence: 99%

“…This occurred because Ca is part of the structural composition of the cell, acts as a cofactor in enzymes involved in ATP and phospholipid hydrolysis, and is a second messenger in metabolic regulation (Taiz and Zeiger, 2013). That results in an additional difficulty to its release from decomposing residues into the soil (Teixeira et al, 2011). The smallest remaining Ca content in the WD residue is due in part to a lower t ½ (34 days) in non-structural biomass (Table 2) and the low remaining C/N ratio (Table 3), which increased decomposition and thus intensified Ca release.…”

Section: Treatment Days After Deposition Of Litter Bags (Dad)mentioning

confidence: 99%

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Cover Crops Effects on Soil Chemical Properties and Onion Yield

Oliveira

Brunetto

Loss

et al. 2016

Rev. Bras. Ciênc. Solo

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ABSTRACT:Cover crops contribute to nutrient cycling and may improve soil chemical properties and, consequently, increase crop yield. The aim of this study was to evaluate cover crop residue decomposition and nutrient release, and the effects of these plants on soil chemical properties and on onion (Allium cepa L.) yield in a no-tillage system. The experiment was carried out in an Inceptisol in southern Brazil, where cover crops were sown in April 2012 and 2013. In July 2013, shoots of weeds (WD), black oats (BO), rye (RY), oilseed radish (RD), oilseed radish + black oats (RD + BO), and oilseed radish + rye (RD + RY) were cut at ground level and part of these material from each treatment was placed in litter bags. The litter bags were distributed on the soil surface and were collected at 0, 30, 45, 60, 75, and 90 days after distribution (DAD). The residues in the litter bags were dried, weighed, and ground, and then analyzed to quantify lignin, cellulose, non-structural biomass, total organic carbon (TOC), N, P, K, Ca, and Mg. In November 2012 and 2013, onion crops were harvested to quantify yield, and bulbs were classified according to diameter, and the number of rotted and flowering bulbs was determined. Soil in the 0.00-0.10 m layer was collected for chemical analysis before transplanting and after harvesting onion in December 2012 and 2013. The rye plant residues presented the highest half-life and they released less nutrients until 90 DAD. The great permanence of rye residue was considered a protection to soil surface, the opposite was observed with spontaneous vegetation. The cultivation and addition of dry residue of cover crops increased the onion yield at 2.5 Mg ha -1 .

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“…In Brazilian semi-arid region, there are reports of green manures phytomass additions ranging from 1.7 to 11 Mg.ha -1 (Massad et al, 2013), related to the species, soil fertility, climatic conditions, C/N and lignin/total N, among others (Pariz et al, 2011;Teixeira et al, 2011). However, the minimum quantities of biomass were not defined for the positive balance of addition and accumulation dry matter, carbon and nitrogen in the soil, to increase the soil or agroecosystems quality.…”

Section: Introductionmentioning

confidence: 99%

Adubação verde contribuindo para ciclagem de nutrientes em ambientes irrigados no semiárido brasileiro

Brandão

Salviano

Olszevski

et al. 2017

J. Env. Anal. Progr.

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A B S T R A C TThe green manure, through the simultaneous sowing of different species, can be a strategy to mitigate the environmental impact due to the use of fertilizers in irrigated environments in the Brazilian semi-arid. This study aimed to evaluate the dry matter production and the nutrients concentration and accumulation by phytomass of two types of plant mixture and natural vegetation cultivated between lines of a mango orchard, in two soil systems management, during five production cycles. The experiment was conducted in a complete randomized block design with four replications and treatments arranged in subdivided plots scheme. The plots consisted of two soil management systems (tillage and no-tillage), and the subplots consisted of 3 types of green manures: plant mixture 1 (PM1); plant mixture 2 (PM2) and spontaneous vegetation (SV). The dry matter, contents, and accumulation of N, P, K, Ca, Mg and S were evaluated. Plant mixture, independent of their composition, produced higher amounts of dry phytomass compared with natural vegetation and, consequently, accumulated higher amounts of nutrients. The N and P contents were lower in the phytomass of the spontaneous vegetation and the plant mixture with a predominance of grasses and oilseeds, respectively, in the tillage systems. The Ca contents were higher in the plant mixture with a predominance of grasses and oilseeds (PM2), and Mg in the plant mixture with a predominance of legumes (PM1) and the spontaneous vegetation (SV).

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Decomposição e liberação de nutrientes da parte aérea de plantas de milheto e sorgo

Cited by 26 publications

References 19 publications

Manejo do azevém no estabelecimento inicial de plantas, na ciclagem de nutrientes e no rendimento de grãos do arroz irrigado

Manejo do azevém no estabelecimento inicial de plantas, na ciclagem de nutrientes e no rendimento de grãos do arroz irrigado

Cover Crops Effects on Soil Chemical Properties and Onion Yield

Adubação verde contribuindo para ciclagem de nutrientes em ambientes irrigados no semiárido brasileiro

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