Espécies vegetais para cobertura do solo: influência sobre plantas daninhas e a produtividade do algodoeiro em sistema plantio direto

Ferreira, A. C. de B.; Lamas, F. M.

doi:10.1590/s0034-737x2010000600013

Cited by 8 publications

(12 citation statements)

References 13 publications

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“…A utilização do plantio direto pode resultar em mais segurança ao produtor, por proporcionar maior capacidade de armazenar e disponibilizar água às plantas (Bescansa et al, 2006;Vita et al, 2007), pelo fato de o sistema radicular explorar regiões mais profundas do solo (Silva, et al, 2009) e também pelo fato de os tratos convencionais ocasionarem a degradação gradativa dos solos, diminuindo o seu potencial produtivo (Ferreira & Lamas, 2010). Este sistema, normalmente, favorece as espécies daninhas anuais associadas a menor pH e menor teor de cálcio na camada superficial.…”

Section: Introductionunclassified

Ocorrência de plantas daninhas no sistema lavoura-pecuária em função de sistemas de cultivo e corretivo de acidez

et al. 2012

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Occurrence of weeds in the crop-livestock system as a function of cropping systems and acidity correctionStudies on the interaction among weeds, crops and planting systems can provide new systems of pasture introduction, recovering, and renovation. This research aimed to study weed phytosociology in pasture implanted in the fallow cropping. Considering the need of liming application, the treatments followed the combination of two planting systems (no-tillage and plowing followed by harrowing) and four soil pH adjustment levels (0, 1/3, 1/2 and 1 time of the recommendation). It was observed that Sida species showed higher importance value indexes in all treatments. Sida urens and Sida rhombifolia were the most representative. Importance value indexes of plants from the Genus Sida were increased with corrective rates, showing maximum values with half of recommended lime rate, with posterior decrease. Besides grasses and forage legumes which can benefit the system, other species toxic to animals occurred. Perennial grasses showed higher importance value index under conventional planting than in no-tillage system, Ocorrência de plantas daninhas no sistema lavoura-pecuária em função de sistemas de cultivo e corretivo de acidezOs estudos das interações entre plantas daninhas, culturas e sistemas de plantio podem proporcionar o entendimento de novas formas de implantação, recuperação e renovação das pastagens. Assim, objetivou-se estudar a fitossociologia de plantas daninhas em implantação de pastagem por meio da integração lavoura-pecuária, em cultivo safrinha. Admitindose a necessidade de aplicação de corretivo, os tratamentos resultaram da combinação de dois sistema de plantio (semeadura direta e aração seguida pela gradagem) e quatro doses de corretivo da acidez (0, 1/3, 1/2 e 1 vezes a recomendação). Observou-se que plantas do gênero Sida apresentam maiores índices de valor de importância em todos os tratamentos. As espécies Sida urens e Sida rhombifolia foram as mais representativas. Os índices de valor de importância do gênero Sida foram crescentes com as doses do corretivo, apresentando valores máximos com metade da dose recomendada de calcário, com posterior decréscimo. Ocorreram, também, espécies tóxicas aos animais de pastejo, além de gramíneas e leguminosas forrageiras, que podem ser benéficas ao sistema. As espécies de gramíneas perenes apresentaram maiores valores de importância em plantio convencional do que em plantio direto, possibilitando o uso de herbicidas específicos para o primeiro sistema. Comparando o plantio direto com o plantio convencional, o índice de similaridade foi igual a 81,1%, o que é considerado alto. Em geral, o plantio convencional apresentou ainda maior densidade de plantas daninhas que o plantio direto. Palavras-chave:Brachiaria brizantha, correção da acidez, levantamento fitossociológico, plantio direto, safrinha, Zea mays. 647Ocorrência de plantas daninhas no sistema lavoura-pecuária em função de sistemas...Rev. Ceres, Viçosa, v. 59, n.5, p. 646-653, set/out, 2012 INTRO...

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Section: Introductionunclassified

Ocorrência de plantas daninhas no sistema lavoura-pecuária em função de sistemas de cultivo e corretivo de acidez

et al. 2012

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“…However, in works with vegetal, grass and legume species as soil cover for cotton crops (cultivar BRS Cedro), no significant difference was observed for that variable [15,33].…”

Section: Discussionmentioning

confidence: 99%

“…To the residual cover results, can be explained by studies of [15]using vegetal species for soil cover in cotton crops under no-till, values of 906 Kg·ha −1 and 2.422 Kg·ha −1 of straw were obtained for C. spectabilis and P.…”

Section: Discussionmentioning

confidence: 99%

“…This fact is explained by the low C/N ratio of legumes such as C. spectabilis, leading some authors to suggest a mixture of legumes and grasses in order to achieve an intermediate C/N ratio. That makes it possible to decrease the rate of decomposition of vegetal wastes and increase N supply compared to grass-only use [15].…”

Section: Discussionmentioning

confidence: 99%

“…To evaluate the persistence of dry biomass of the plant species, 0.25 m² samples were obtained at random, using an iron square, at three points within the useful area of each plot, 176 days after sowing (DAS) (harvest period) [15].…”

Section: Performing the Experimentsmentioning

confidence: 99%

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Epidemiologic Study of Ramularia areola under Different Soil Covers and Spacings, for Cotton Crops

Pizzato¹,

Araújo²,

Serafim³

et al. 2013

AJPS

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The objective of this work was to evaluate the progress of the areolate mildew of cotton under different soil cover and spacing conditions. The experiment was carried out using randomized blocks and a 2 × 3 factorial design, with two spacings (0.45 m and 0.90 m) and three soil covers (no cover, Pennisetum glaucum and Crotalaria spectabilis) with four replications. The plants were inoculated with R. areola, sixty DAS. A total of 14 evaluations of disease severity were performed. At the lower, middle and upper thirds of plants, a diagram scale with nine levels of severity was used and the resulting data were converted into the AUDPC. Gompertz, logistic, and monomolecular mathematical models were tested in the disease severity curves for each third. Agronomics characteristics were evaluated as well. Significant differences of AUDPC were found for the cotton plants thirds, and the middle third was the highest AUDPC. Significant difference for the lower and upper thirds, whose AUDPC were highest on 0.90 m spacing, was observed too. The disease progress curves of the thirds did not fit the tested models. Significant results to the both covers situations, where the treatments grown on crotalária cover and without cover had highest AUDPC, were evidenced. The treatments with C. spectabilis cover were taller than other treatments. Significant data were observed for the cover crops used and in the treatments grown at 0.90 m spacing, to residual cover and crop yield, respectively.

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Nitrogen fertilization on cotton cropped under straw formed by seed proportions of crotalaria and brachiaria

Borin¹,

Ferreira²,

Brito³

et al. 2015

Científica

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Espécies vegetais para cobertura do solo: influência sobre plantas daninhas e a produtividade do algodoeiro em sistema plantio direto

Cited by 8 publications

References 13 publications

Ocorrência de plantas daninhas no sistema lavoura-pecuária em função de sistemas de cultivo e corretivo de acidez

Ocorrência de plantas daninhas no sistema lavoura-pecuária em função de sistemas de cultivo e corretivo de acidez

Epidemiologic Study of Ramularia areola under Different Soil Covers and Spacings, for Cotton Crops

Nitrogen fertilization on cotton cropped under straw formed by seed proportions of crotalaria and brachiaria

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