Crescimento e nutrição mineral de Sida rhombifolia

Bianco, S.; Carvalho, Lara Siqueira Oliveira; Bianco, Matheus Saraiva

doi:10.1590/s0100-83582014000200008

Cited by 7 publications

(9 citation statements)

References 11 publications

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“…It is significant that DM yields of this species at 120 days were equal to those of Marandu in the unweeded plots. Sida rhombifolia, despite the low DM accumulation during virtually the entire period, began to show greater vegetative growth only after 90 DAE, which is in agreement with findings of Bianco et al (2014). When analyzing growth and mineral nutrition of S. rhombifolia, these authors found that the species actually has slow vegetative growth up to 80 DAE, with peak DM accumulation occurring after 140 DAE.…”

Section: Coexistence Period (Days) Discussionsupporting

confidence: 81%

Weeds alter the establishment of Brachiaria brizantha cv. Marandu

Marchi

Bellé²,

Foz³

et al. 2017

Trop. Grassl.-Forrajes Trop.

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Weeds alter the establishment of Brachiaria brizantha cv. Marandu Malezas afectan el establecimiento de AbstractThe present study evaluated the effects of different periods of coexistence among the main weeds and Marandu brachiaria grass (Brachiaria brizantha, now Urochloa brizantha) in newly sown pasture. The experiment was conducted in a randomized block with 4 replications, with treatments being 8 coexistence periods: 0, 15, 30, 45, 60, 75, 90 and 120 days after emergence. A phytosociological assessment of the weed community was carried out at the end of the coexistence periods, and weeds were eliminated from the appropriate treatment using herbicide. Key morphogenic parameters of the forages were assessed at the end of the experimental period and dry matter production was determined. Results indicated that the presence of weeds had negative impacts on the main morphogenic components, such as plant height, number of tillers and production of leaf and stem dry matter. The presence of weeds reduced productivity in Marandu, with 15 days competition being sufficient to reduce forage production by approximately 50%, suggesting that weed control measures should be adopted within 15 days following emergence of seedlings of Marandu and weeds.Keywords: Dry matter, interference, pasture renovation, weed competition. ResumenEn un latosol localizado en Sinop, Mato Grosso, Brasil se evaluaron los efectos de la infestación de las principales malezas de la zona (Hyptis suaveolens, Senna obtusifolia y Sida rhombifolia), en diferentes edades después de la siembra, en la producción y algunas características morfogénicas de la gramínea forrajera Brachiaria brizantha (ahora: Urochloa brizantha) cv. Marandu. Los tratamientos fueron dispuestos en un delineamiento experimental de bloques al azar con 4 repeticiones y consistieron en los períodos de convivencia: 0, 15, 30, 45, 60, 75, 90 y 120 días después de la emergencia de la gramínea. Al finalizar cada uno de estos períodos se realizó una evaluación fitosociológica de la comunidad infestante y se eliminaron las malezas utilizando un herbicida. Al término del período experimental se evaluaron los principales parámetros morfogénicos del pasto, así como la producción de materia seca. Los resultados mostraron un efecto negativo de las malezas en la altura de planta y el número de rebrotes, así como en la producción de materia seca de hojas y tallos. La presencia de las malezas redujo la producción del pasto en todos los tratamientos, variando de 50% (competencia durante los primeros 15 días) hasta 74% (120 días). Por tanto las medidas de control de las malezas deben ser adoptadas durante las 2 primeras semanas de convivencia con el pasto Marandu.Palabras clave: Competencia, interferencia, materia seca, renovación de pasturas.

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Section: Coexistence Period (Days) Discussionsupporting

confidence: 81%

Weeds alter the establishment of Brachiaria brizantha cv. Marandu

Marchi

Bellé²,

Foz³

et al. 2017

Trop. Grassl.-Forrajes Trop.

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“…In most cases, weeds are native species and have greater adaptability to the environment than cultivated plants; this gives plant development adequacy and adjusted allocation capacity of resources from the environment (Erasmo et al, 1997;Bianco et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Nutritional Value of Marandú Palisade Grass According to Increasing Coexistence Periods with Weeds

Bellé¹,

Marchi

Martins

et al. 2018

Planta daninha

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This research aimed at evaluating the effect of increasing coexistence periods with weeds on the nutritional components of the forage grass Brachiaria brizantha cv. Marandú under pasture renewal conditions. The experiment was arranged in randomized blocks with four replications, and treatments were represented by eight coexistence periods, namely: 0, 15, 30, 45, 60, 75, 90 and 120 days after seedling emergence. A phytosociologic evaluation was performed on the weed community at the end of the coexistence periods; later, weeds were eliminated by an herbicide formulated with aminopyralid+2,4-D (40+320 g L-1) at 2.5 L ha-1, applied in post-emergence. The fodder plants were evaluated at the end of the experimental period as for leaf-stem ratio, volumetric density of green leaf, volumetric density of total dry matter and main nutritional components, including: crude protein, neutral detergent fiber, ether extract, organic matter and mineral matter, and from this, the total carbohydrate content was calculated. The presence of weeds altered the pasture structure, since it affected negatively the leaf/stem ratio and the volumetric leaf density of B. brizantha. The coexistence also reduced the nutritional components of B. brizantha and determined that control measures should be adopted before reaching 30 days of coexistence between fodder plants and weeds.

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“…Concerning S. rhombifolia dry mass accumulation, Bianco et al (2014) reported that N and K are the most required macronutrients; macronutrient accumulation daily rate is cumulative until 94 DAE; and periods of increased accumulation of dry mass and macronutrients occur after 122 DAE.…”

Section: Resultsmentioning

confidence: 99%

Weed dry mass accumulation in response to the application of NPK fertilizers in cassava crop

Soares¹,

Neto²,

José³

et al. 2015

Afr. J. Agric. Res.

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Fertilizers can be used to change competition relationships between crop and weed by promoting crop species growth, since rival species has a differentiated response to nutrients. We aimed to evaluate weed dry mass accumulation when or not NPK (nitrogen, phosphorus and potassium) fertilizers were applied to cassava crop. Therefore, weed samples were collected every 35 days, from 35 to 525 days after cassava planting, by randomly throwing a 0.25 m 2 metal square (0.5 m × 0.5 m) within useful area of the plots with and without fertilization. After each thrown, it was removed weed shoot, separated by species, then counted and weighed to determine number of plants and shoot dry mass. Fertilization did not influenced the weed population during most part of the crop cycle; however, promoted greater weed dry mass accumulation in the second crop year, 350 days after planting. Panicum maximum, Brachiaria plantaginea, Sida rhombifolia, Pavonia cancellata, Setaria parviflora and Cynodon dactylon, which were the most abundant weeds, had different responses to fertilization. P. maximum and B. plantaginea have outstood because of their shoot dry mass increase of 41.59 and 36.25%, respectively, when comparing fertilized and non-fertilized treatments.

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Crescimento e nutrição mineral de Sida rhombifolia

Cited by 7 publications

References 11 publications

Weeds alter the establishment of Brachiaria brizantha cv. Marandu

Weeds alter the establishment of Brachiaria brizantha cv. Marandu

Nutritional Value of Marandú Palisade Grass According to Increasing Coexistence Periods with Weeds

Weed dry mass accumulation in response to the application of NPK fertilizers in cassava crop

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