Sistema radicular de seis gramíneas irrigadas em diferentes adubações nitrogenadas e manejos

Cunha, Fernando França da; Ramos, Márcio Mota; Alencar, Carlos Augusto Brasileiro de; Martins, C. E.; Cóser, A. C.; Oliveira, Rubens Alves de

doi:10.4025/actasciagron.v32i2.1020

Cited by 22 publications

(24 citation statements)

References 14 publications

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“…Concerning water management, there are two important parameters: fine root length or root surface area (van Noordwijk, 1993) and the effective rooting depth (ERD). Irrigation studies in Brazil usually consider ERD as the depth in which 80% of the fine roots are found (Cunha et al, 2010). ERD is an essential parameter to determine soil water availability and then water management in crop systems (Allen et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

Root growth and distribution in sugarcane cultivars fertigated by a subsurface drip system

Ohashi¹,

Pires²,

Ribeiro

et al. 2015

Bragantia

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Despite of the agronomic importance for water management, few studies of sugarcane roots have been performed under field conditions during the crop cycle. The aim of this study was to determine the cumulative root density (L A ), root distribution on soil profile and the effective rooting depth (ERD) for three sugarcane cultivars using the minirhizotron method. A field experiment was done with sugarcane cultivars IACSP94-2094, IACSP94-2101 and SP79-1011 grown under subsurface drip fertigation. Soil chemical and physical characteristics were also evaluated. Root evaluations were taken at 38, 58, 123, 185 and 205 days during the second ratoon, considering the soil profile until 0.8 m depth. The highest L A and root growth rates were found up to 0.4 m soil layer for all cultivars. Root growth rate varied during the crop cycle, with the highest values being found between 38 and 58 days after ratoon (DAR). There was a genotypic variation in root growth, with IACSP94-2101 showing the highest L A of 12.9 mm cm

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Section: Introductionmentioning

confidence: 99%

Root growth and distribution in sugarcane cultivars fertigated by a subsurface drip system

Ohashi¹,

Pires²,

Ribeiro

et al. 2015

Bragantia

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“…However, the buildup of roots in the more superfi cial layers of the soil can make the plant vulnerable to water defi cits, since in long periods of dry spells it will be more diffi cult for the sward to absorb water from deep layers (CUNHA et al, 2010). Another problem derived from the shallow root system is the reduced range for the plant to obtain nutrients from the soil, in which case the plant would require a higher concentration of nutrients in a smaller volume of soil (RIBEIRO et al, 2011).…”

Section: Resultsmentioning

confidence: 99%

Root system and resistance to penetration of Mombaça grass fertilized with nitrogen and irrigated

Beloni¹,

Piotto²,

Mari³

et al. 2016

SCA

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High stocking rates in intensive pasture-based animal production systems may compromise the development of the forage roots due to increased resistance in the surface layer. This study tested the hypothesis that an increase in stocking rate resulting from different levels of nitrogen fertilization in irrigated Mombaça grass (Panicum maximum Jacq. cv. Mombaça) pasture under intermittent grazing could increase resistance to penetration and consequently the growth of the root system. A split-plot design with randomized blocks and subplots was used, including three replications and the following four treatments: 0, 200, 400 and 800 kg N ha −1 year. Evaluations performed in spring, summer and fall seasons were assigned as subplots. The highest values for area, diameter, length and percentage of root biomass (91.4%) were concentrated at the 0-10 cm soil depth, which is explained by the lower penetration resistance in this layer. Increased stocking rate resulting from increased levels of nitrogen in the Mombaça grass sward does not directly affect the penetration resistance of the soil or root characteristics. However, in the rainy season, higher nitrogen levels lead to increased resistance, as they provide higher cumulative stocking rates in this period. Key words: Irrigation. Nitrogen fertilization. Panicum maximum. Soil compaction. ResumoElevadas taxas de lotação em sistemas intensivos de produção animal a pasto podem comprometer o desenvolvimento das raízes de forrageiras, devido ao aumento da resistência do solo na camada superficial. Neste estudo testou-se a hipótese que o aumento da lotação animal devido a diferentes doses de nitrogênio em pasto de capim-Mombaça (Panicum maximum Jacq. cv Mombaça), irrigado e sob pastejo intermitente poderiam comprometer a resistência à penetração e consequentemente o crescimento do sistema radicular. Utilizou-se delineamento experimental em blocos ao acaso com parcelas subdivididas, com três repetições e quatro tratamentos: 0, 200, 400 e 800 kg de N ha −1 ano. Nas subparcelas foram consideradas as quatro estações do ano. As características geométricas (área,

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“…7; In this study, the root system and soil penetration capacity were directly proportional (Table 4). The root system well developed, gives the plant greatest capacity to withstand stress, such as severe winters, dry summers and grazing (Cunha et al, 2010).…”

Section: +3mentioning

confidence: 99%

“…Root depth is fundamental for acidity adjustment, soil fertility and addition of water blade (Doran & Parkin, 1994;Stenberg, 1999). Furthermore, this depth has a positive influence on leaf growth and biomass production (Stenberg, 1999;Cunha et al, 2010).…”

Section: +3mentioning

confidence: 99%

Biofertigation of Forage With Effluents From a Cattle Slaughterhouse Green Line: Impacts on Physical-Chemical Indicators of Soil Quality and on Production Biomass

Carvalho¹,

Luz²,

Henrique³

et al. 2018

JAS

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Cattle slaughterhouses are potential causes the environmental impacts, as it require a large volume of water in meat processing, generate large effluents amount, and promote the Cerrado deforestation for animal husbandry. Therefore, we aim was carried out to assess the effects of the soil application of a green line wastewater from a cattle slaughterhouse in the Brachiaria brizantha growth. The M1 and M2 managements did not contain wastewater of slaughterhouse. The wastewater from the 3 rd stabilization pond (M3 to M5), from reception box (M6 to M8), and manure (M9 and M10) were used in the biofertigation managements. The physical-chemical indicators levels did not show significant differences (p < 0.05) before soil preparation and after managements. However, biofertigation in the Cerrado soil can provide a mitigation of the leaching of fine soil particles and cations. In addition, maximum nitrogen dose of wastewater provided a higher leaf biomass productivity than commercial nitrogen. Thus, the fertigation with wastewater can reduce the use of water bodies to crops irrigation and the incorporation of new areas with native vegetation to the agricultural production systems.

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Sistema radicular de seis gramíneas irrigadas em diferentes adubações nitrogenadas e manejos

Cited by 22 publications

References 14 publications

Root growth and distribution in sugarcane cultivars fertigated by a subsurface drip system

Root growth and distribution in sugarcane cultivars fertigated by a subsurface drip system

Root system and resistance to penetration of Mombaça grass fertilized with nitrogen and irrigated

Biofertigation of Forage With Effluents From a Cattle Slaughterhouse Green Line: Impacts on Physical-Chemical Indicators of Soil Quality and on Production Biomass

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