Fitomassa de raízes e da parte aérea da cana-de-açúcar relacionada à adubação nitrogenada de plantio

Otto, Rafael; Franco, Henrique Coutinho Junqueira; Faroni, Carlos Eduardo; Vitti, André César; Trivelin, Paulo César Ocheuze

doi:10.1590/s0100-204x2009000400010

Cited by 44 publications

(32 citation statements)

References 6 publications

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“…This fact may have contributed to that there was the need of the plants subjected to irrigation, deepen the root system for nutrients, corroborating OTTO et al (2009), to establish that deep root growth also occurs when the plant needs to absorb nutrients essential to their development.…”

Section: Root Lengthsupporting

confidence: 54%

Root system distribution of sugarcane irrigated with domestic sewage effluent aplication by subsurface drip system

Sousa¹,

Matsura

Elaiuy³

et al. 2013

Eng. Agríc.

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Irrigation with domestic sewage effluent (DSE) has been recommended by subsurface dripping, as it can obtain a high rate of irrigation efficiency and faster use of salts in comparison with other irrigation methods. The study aimed at evaluating the area, the length and the effective depth of the root system of sugarcane irrigated with DSE by subsurface drip system and with different irrigation rates at depths of 0. 00-0.20, 0.20-0.40, 0.40-0.60 and 0.60-0.80m. The experiment was carried out in the municipality of Piracicaba, in the state of São Paulo (SP), Brazil, in a sugarcane area irrigated with DSE in a completely randomized blocks set up in furrows, with three replications and four treatments, which are: one area without irrigation (AWI) and three irrigated areas meeting 50% (T50%), 100% (T100%) and 200% (T200%) of the crop's water need between each round of irrigation. T100% and T200% provided smaller areas and lengths of roots in the two deepest layers, as compared to AWI and T50%, which stimulated the development of deeper roots due to the water stress. TWI, T100% and T200% presented 80% of the roots up to a depth of 0.40m and T50% treatment presented 76.43% of roots total. KEYWORDS:Root; water reuse; subsurface drip. DISTRIBUIÇÃO DO SISTEMA RADICULAR DA CANA-DE-AÇÚCAR IRRIGADA COM EFLUENTE DE ESGOTO DOMÉSTICO POR GOTEJAMENTO SUBSUPERFICIAL RESUMO:A irrigação com efluente de esgoto doméstico (EED) tem sido recomendada para aplicação por gotejamento subsuperficial, podendo-se obter elevados índices de eficiência de irrigação e mais rápido aproveitamento dos sais em comparação com outros métodos de irrigação. O trabalho objetivou avaliar a área de raiz, o comprimento e a profundidade efetiva do sistema radicular da cana-de-açúcar irrigada com EED aplicado por gotejamento subsuperficial e com diferentes lâminas de irrigação, nas camadas de solo de 0,00-0,20; 0,20-0,40; 0,40-0,60 e 0,60-0,80 m. O experimento foi realizado em Piracicaba-SP, numa área de cana-de-açúcar irrigada com EED, em um delineamento de blocos casualizados dispostos no esquema de faixas, com três repetições e quatro tratamentos, sendo estes: uma área sem irrigação (TSI) e três áreas irrigadas, atendendo a 50% (T50%), 100% (T100%) e 200% (T200%) da necessidade hídrica da cultura entre cada turno de rega. O T100% e o T200% proporcionaram menores áreas e comprimento de raízes nas duas camadas mais profundas, quando comparados ao TSI e ao T50%, que devido ao estresse hídrico, proporcionado à cultura, estimularam o desenvolvimento de raízes mais profundas. O TSI, T100% e T200% apresentaram 80% das raízes até 0,40 m e, nessa mesma profundidade, o tratamento T50% apresentou 76,43% do total de raízes.

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Section: Root Lengthsupporting

confidence: 54%

Root system distribution of sugarcane irrigated with domestic sewage effluent aplication by subsurface drip system

Sousa¹,

Matsura

Elaiuy³

et al. 2013

Eng. Agríc.

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“…After sampling, the next step is the quantification of root properties, which in some studies, e.g. Otto et al (2009), is limited to root dry matter. In other studies (Imhoff et al, 2010;Mei et al, 2011;Grzesiak et al, 2013), roots were analyzed for a higher number of properties, i.e., root length, surface area, volume, diameter classes, and structure.…”

Section: Introductionmentioning

confidence: 99%

Public-domain software for root image analysis

Costa

Cunha

Jorge

et al. 2014

Rev. Bras. Ciênc. Solo

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SUMMARYIn the search for high efficiency in root studies, computational systems have been developed to analyze digital images. ImageJ and Safira are public-domain systems that may be used for image analysis of washed roots. However, differences in root properties measured using ImageJ and Safira are supposed. This study compared values of root length and surface area obtained with public-domain systems with values obtained by a reference method. Root samples were collected in a banana plantation in an area of a shallower Typic Carbonatic Haplic Cambisol (CXk), and an area of a deeper Typic Haplic Ta Eutrophic Cambisol (CXve), at six depths in five replications. Root images were digitized and the systems ImageJ and Safira used to determine root length and surface area. The line-intersect method modified by Tennant was used as reference; values of root length and surface area measured with the different systems were analyzed by Pearson's correlation coefficient and compared by the confidence interval and t-test. Both systems ImageJ and Safira had positive correlation coefficients with the reference method for root length and surface area data in CXk and CXve. The correlation coefficient ranged from 0.54 to 0.80, with lowest value observed for ImageJ in the measurement of surface area of roots sampled in CXve. The IC (95 %) revealed that root length measurements with Safira did not differ from that with the reference method in CXk (-77.3 to 244.0 mm). Regarding surface area measurements, Safira did not differ from the reference method for samples collected in CXk (-530.6 to 565.8 mm 2 ) as well as in CXve (-4231 to 612.1 mm 2 ). However, measurements with ImageJ were different from those obtained by the reference method, underestimating length and surface area in samples collected in CXk and CXve. Both ImageJ and Safira allow an identification of increases or decreases in root length and surface area. However, Safira results for root length and surface area are closer to the results obtained with the reference method.Index terms: root length, root surface area, image processing, root system.

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“…However, this increase seems to be directly correlated to higher stalk yields, as observed in table 3. Dalri & Cruz (2008) obtained similar results by observing a significant effect on ratoon and second ratoon management in sugarcane (cultivar RB 72454) that was irrigated through a subsurface drip and utilized the same doses of N and K. Otto et al (2009) concluded that nitrogen fertilization in sugarcane (cultivar SP81-3250), cultivated in eutrophic red-yellow latosol, increased the dry mass growth of the aerial parts of the plant.…”

Section: Field Experimentsmentioning

confidence: 82%

Interaction between N-fertilizer and water availability on borer-rot complex in sugarcane

et al. 2015

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This study aimed to evaluate the effects of nitrogen availability in fertigation and rainfed management, as well as their interactions with the incidence of and damage caused by D. saccharalis and red rot in sugarcane. The experiment consisted of four treatments (0 and 150 kg ha -1 of N-fertilizer with irrigation; 0 and 150 kg ha -1 of N-fertilizer in rainfed management) in a randomized complete block design with four replications. The evaluated parameters were the number of holes and internodes with red rot per meter of cultivation, stalk yield and sugar content. In the laboratory (T = 25 ± 2 °C; R.H. = 70 ± 10%: 12:12-L:D), we evaluated the attractiveness and consumption of fragments of stalks from the different treatments for fourth instar larvae through choice and no-choice tests in a randomized complete block design with ten replications. Nitrogen fertilization via irrigation has favorable effects on borer-rot complex and leads to higher gains in stalk and sugar yields when compared to rainfed management. The increments of stalk and sugar yields due to nitrogen fertilization compensates for the increase in borer-rot complex infestation. In laboratory tests, D. saccharalis larvae were similarly attracted to all treatments regardless of the doses of N-fertilizer or the water regimes evaluated. However, fragments of sugarcane stalks produced with nitrogen fertilization were consumed more by D. saccharalis in both water regimes.

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Fitomassa de raízes e da parte aérea da cana-de-açúcar relacionada à adubação nitrogenada de plantio

Cited by 44 publications

References 6 publications

Root system distribution of sugarcane irrigated with domestic sewage effluent aplication by subsurface drip system

Root system distribution of sugarcane irrigated with domestic sewage effluent aplication by subsurface drip system

Public-domain software for root image analysis

Interaction between N-fertilizer and water availability on borer-rot complex in sugarcane

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