Arranjo espacial, densidade e época de semeadura no acúmulo de matéria seca e nutrientes de três adubos verdes

Lima, Juliana Domingues; Sakai, Ronaldo Kazuo; Aldrighi, Michel; Sakai, Mauro

doi:10.1590/s1983-40632010000400015

Cited by 11 publications

(13 citation statements)

References 30 publications

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“…Crotalaria effectiveness as a green manure essentially depends on plant biomass production under local conditions (WUTKE et al, 1993). Lima et al (2010) evaluated plant spatial arrangement, density and sowing time for three green manures; they observed that regardless of the sowing density, crotalaria was the most efficient species in dry biomass accumulation. The same authors noted that the largest dry matter accumulations occurred at the lowest density (500,000 plants/ha), registering yields of 16 t.ha -1 dry weight.…”

Section: Resultsmentioning

confidence: 99%

Biomass Yield of Crotalaria Juncea After Thinning and at Varied Sowing Densities in the Coastal Plateau of Piauí State, Brazil

et al. 2016

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-The northern region of Piauí state is an important center of irrigated organic fruit farming, wherein sandy soils with low organic matter content are predominant, besides climate with high temperatures, long periods of water deficit and constant wind. Given this situation, it becomes necessary to investigate alternative management options able to meet the challenges of agricultural productivity. In this context, green manuring becomes an important practice, mainly when using fast-growing species and with great potential for biomass production. Thus, a study was carried out at Embrapa Meio-Norte to measure Crotalaria juncea biomass yield after thinning and at various sowing densities. The evaluated parameters were plant height, stem diameter, number of branches per plant, fresh and dry weight of shoots and roots. The results showed that sowing density had no influence on plant height; however, unthinned plants reached greater heights, which might have been due to reduced competition for light. Thinning had no effect on diameters of plant stem base; on the other hand, lower planting densities promoted larger diameters also due to less competition. Likewise, the number of branches per plant was not affected by thinning, being greater at lower planting densities on account of less competition. Thinned plants achieved higher averages of fresh shoot weight. Nevertheless, shoot dry biomass was greater at higher planting densities. Furthermore, both fresh and dry weight of roots were not influenced by any of the adopted treatments.Key words: Green manuring. Cover crops. Management. PRODUTIVIDADE DA CROTALARIA JUNCEA SOB PODAS E DENSIDADES DE SEMEADURA NOS TABULEIROS COSTEIROS DO PIAUÍRESUMO -Na região norte do Estado do Piauí, concentra-se um importante polo de fruticultura orgânica irrigada, onde há predomínio de solos com textura arenosa e baixos teores de matéria orgânica, além de clima com temperaturas elevadas, com longos períodos de déficit hídrico e vento constante. Diante desse quadro, faz-se necessário investigar formas alternativas de manejo, capazes de responder aos desafios da produção agrícola. Portanto, é relevante destacar a utilização da adubação verde, principalmente com espécies de crescimento rápido e com bom potencial de produção de biomassa. Com o objetivo de avaliar a produtividade da C. juncea. sob a influência de podas e densidades de semeadura, foi instalado um ensaio na Embrapa Meio-Norte. Foram avaliadas a altura das plantas, diâmetro de caule, número de ramos por planta, massa fresca e seca da parte aérea e das raízes. A densidade de semeadura não influenciou na altura das plantas, no entanto, observou-se maior altura das plantas que não foram podadas, provavelmente, em função da menor competição por luz. O diâmetro do colo das plantas não foi influenciado pelas podas, porém, foi maior na menor densidade de plantio, em função da menor competição. O número de ramos nas plantas também não foi influenciado pelas podas, entretanto, foi maior quanto menor a densidade de plantio, possivel...

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Section: Resultsmentioning

confidence: 99%

Biomass Yield of Crotalaria Juncea After Thinning and at Varied Sowing Densities in the Coastal Plateau of Piauí State, Brazil

et al. 2016

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“…Produtividades relativamente baixas para essas espécies, quando semeadas na mesma época na região do Cerrado, também são relatadas em outros trabalhos (Burle et al, 1999;Carvalho et al, 2004;Sodré Filho et al, 2004;Torres et al, 2005;Carvalho et al, 2008). No entanto, produtividades duas a três vezes superiores de matéria seca são comumente obtidas com o cultivo dessas espécies no início ou mesmo no final da estação chuvosa, com precipitações excepcionalmente mais elevadas e melhor distribuição de chuvas (Carsky et al, 1990;Boer et al, 2007;Lima et al, 2010;Marcelo et al, 2012).…”

Section: Resultsunclassified

Manejo de plantas de cobertura na floração e na maturação fisiológica e seu efeito na produtividade do milho

Carvalho

Coser

Rein

et al. 2015

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar o efeito do manejo de plantas de cobertura na floração e na maturação fisiológica sobre a produtividade do milho cultivado em sucessão. O experimento, em delineamento de blocos ao acaso com parcelas subdivididas, foi realizado em Latossolo Vermelho, em sistema plantio direto, com nove espécies. Foram avaliados: produtividade de matéria seca; tempo de ciclagem dos resíduos vegetais; teores de N das plantas de cobertura; e produtividade de grãos e teores de N nas folhas do milho. As espécies Pennisetum glaucum, Mucuna aterrima, Cajanus cajan e Canavalia brasiliensis apresentaram as maiores produtividades de matéria seca na floração. Na maturação fisiológica, Sorghum bicolor, P. glaucum, C. brasiliensis, Crotalaria juncea e C. cajan apresentaram produtividades mais elevadas de fitomassa. Não houve efeito da época de corte e da interação planta de cobertura e época de corte sobre a produtividade do milho. As maiores produtividades de milho foram obtidos após cultivo de Urochloa ruziziensis, C. juncea, C. brasiliensis, C. cajan, P. glaucum e Raphanus sativus, e estão relacionadas ao maior acúmulo de matéria seca e ao menor tempo de ciclagem dos resíduos vegetais das plantas de cobertura.Termos para indexação: Brachiaria ruziziensis, Canavalia brasiliensis, Pennisetum glaucum, decomposição de resíduos vegetais, plantio direto, ciclagem de nutrientes. Management of cover crops at flowering and physiological maturity and its effect on maize yieldAbstract -The objective of this work was to evaluate the effect of cover crop management at flowering and physiological maturity on maize yield cultivated in succession. The experiment, in a randomized complete block design in a split-plot arrangement, was carried out on a Cerrado Oxisol under no-tillage system, with nine species. The following were evaluated: dry matter yield; turnover time of plant residues; N contents in cover crop plants; and maize grain yield and N contents in leaves. The species Pennisetum glaucum, Mucuna aterrima, Cajanus cajan, and Canavalia brasiliensis showed the highest dry matter yields during flowering. In physiological maturity, Sorghum bicolor, P. glaucum, C. brasiliensis, Crotalaria juncea, and C. cajan showed higher phytomass contents. There was no effect of mowing time and of the interaction between cover crop species and mowing time on maize yields. The highest maize yields were obtained after planting of Urochloa ruziziensis, C. juncea, C. brasiliensis, C. cajan, P. glaucum, and Raphanus sativus, and are associated with the higher dry matter yield and lower turnover time of the plant residues of the cover crop species.

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“…Caatinga, Mossoró, v. 35, n. 1, p. 14 -25, jan. -mar., 2022 20 SOARES;MIRANDA, 2016;LIMA et al, 2010;CALVO et al, 2010). The higher value of C found in the species CJ, both in year 1 and in year 2, is related to its rapid initial growth in the first 40 days after sowing -DAS (TEODORO et al, 2011).…”

Section: Resultsmentioning

confidence: 93%

Interactions Between Green Manure and Rock Phosphate on Soil Nutrient Cycling on Family Farms

Leite¹,

Couto

Blesh

2022

Rev. Caatinga

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Family farming is important for the production of food for human consumption, but it lacks resources to invest in the soil fertility of its crops. The objective of this study was to analyze whether the use of green manures increases soil fertility in terms of the nutrients N, P and K with low environmental risk for family agricultural production. An experiment was set up in the State of Mato Grosso (Brazil), in randomized complete block design, with a 6 x 3 factorial scheme, four replications, corresponding to 6 types of plants and 3 doses of phosphorus. Leguminous green manure plants were: velvet bean, Crotalaria juncea, Crotalaria ochroleuca and dwarf pigeon pea, in addition to plots with pearl millet and weedy fallow control. Rock phosphate (i.e., reactive natural phosphate) was applied as a source of phosphorus at 0, 50 and 100 kg P2O5 ha-1. The species used as green manure were cut in full bloom and the levels of N, P, K and C in plants and soil were determined. Leguminous green manure plants, after mineralization, increased the stocks of N, P and K in the soil. Crotalaria juncea was the one that reached the highest N accumulation in its constitution, being recommended in the intercropping with species with C/N ratio > 30 to minimize risks of contamination with nitrate in the soil. This work concluded that the managements with green manure plants, especially Crotalaria ochroleuca, are recommended and environmentally safe technical alternatives for family farming.

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Arranjo espacial, densidade e época de semeadura no acúmulo de matéria seca e nutrientes de três adubos verdes

Cited by 11 publications

References 30 publications

Biomass Yield of Crotalaria Juncea After Thinning and at Varied Sowing Densities in the Coastal Plateau of Piauí State, Brazil

Biomass Yield of Crotalaria Juncea After Thinning and at Varied Sowing Densities in the Coastal Plateau of Piauí State, Brazil

Manejo de plantas de cobertura na floração e na maturação fisiológica e seu efeito na produtividade do milho

Interactions Between Green Manure and Rock Phosphate on Soil Nutrient Cycling on Family Farms

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