Macronutrientes em folhas diagnósticas do capim-tanzânia adubado com nitrogênio e cálcio

Silveira, Cristiane Prezotto; Monteiro, Francisco Antônio

doi:10.1590/s1516-35982010000400006

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…It is worth pointing out that the cultivar Tanzania absorbs the lowest Mg contents when irrigated with fish farming effluent in the first, second and third cuts, compared to the others, with contents of 4.34, 6.26 and 8.09 g Mg kg -1 of dry matter, respectively. However, the values obtained for Tanzania grass are higher than those found in the literature, which range from 1.8 to 2.5 g (Mg) kg -1 of dry matter (SILVEIRA; MONTEIRO, 2010). The high Mg contents observed in P. maximum cultivars can be explained by the high concentrations of Mg in Table 6.…”

Section: Resultsmentioning

confidence: 58%

Biomass and nutrient contents in Panicum maximum cultivars irrigated with fish farming effluent

Ferreira,

Gurgel,

Dias

et al. 2023

Rev. Caatinga

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Wastewater reuse is an alternative for irrigated agriculture in semi-arid regions, due to water support and nutritional supply. Thus, the objective was to evaluate biomass production and nutrient contents in three cultivars of Panicum maximum irrigated with fish farming effluent. The experiment was carried out in a greenhouse, with a complete randomized block design in a split-splitplot scheme. The plot consisted of three types of irrigation management (public-supply water (control), control + conventional fertilization, and irrigation with fish farming effluent). The subplot consisted of three cultivars of P. maximum (Tanzania, Mombasa, and Massai). The sub-subplot consisted of four cutting times (45, 90, 135, and 180 days after sowing). At each cutting time, biomass production and nitrogen, phosphorus, potassium, calcium, magnesium, sodium, iron, copper, manganese, and zinc contents were determined. Irrigation with fish farming effluent increases sodium content in all P. maximum cultivars and causes reduction in biomass production. The salinity of fish farming effluent increased calcium, magnesium, iron, manganese, and zinc contents in the tissues.

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Section: Resultsmentioning

confidence: 58%

Biomass and nutrient contents in Panicum maximum cultivars irrigated with fish farming effluent

Ferreira,

Gurgel,

Dias

et al. 2023

Rev. Caatinga

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“…Isso se deve ao fato que, de todo o nitrogênio presente na parte aérea formada na primeira semana após o corte das plantas, 80% pode ser proveniente da translocação do nitrogênio a partir das raízes e dos colmos e o restante proveniente da absorção de nitrogênio (Chapman & Lemaire, 1996). Assim, o suprimento de nitrogênio para a parte aérea (Silveira & Monteiro, 2010) fica dependente de um sistema radicular mais desenvolvido.…”

Section: Resultsunclassified

Influência da adubação com nitrogênio e cálcio nas características morfológicas e produtivas das raízes de capim-tanzânia cultivado em solução nutritiva

Silveira

Monteiro

2011

R. Bras. Zootec.

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RESUMO -Avaliaram-se as características radiculares de Panicum maximum Jacq. cv. Tanzânia em resposta a uma solução nutritiva com combinações de doses de nitrogênio e cálcio. Empregou-se quartzo moído como substrato, em um experimento realizado em casa de vegetação no período da primavera, em delineamento de blocos ao acaso, com quatro repetições, em esquema fatorial 5 2 fracionado, com 13 combinações de nitrogênio e cálcio, em mmol/L: 2-0,5; 2-3,0; 2-5,5; 9-1,75; 9-4,25; 16-0,5; 16-3,0; 16-5,5; 23-1,75; 23-4,25; 30-0,5; 30-3,0 e 30-5,5. Após o terceiro corte das plantas, realizou-se a coleta das raízes. A combinação de altas doses de nitrogênio com baixas doses de cálcio proporcionou máximas produções de massa seca e concentração de nitrogênio nas raízes. Os níveis críticos de nitrogênio e cálcio nas raízes do capim-tanzânia foram de 11,07 e 1,30 g/kg, respectivamente. Coeficientes de correlação significativos foram encontrados para massa seca, comprimento total e superfície total das raízes. O comprimento e a superfície total e o comprimento e a superfície específicos das raízes dependem do suprimento de nitrogênio, não de cálcio. Doses de cálcio exclusivas são determinantes da concentração desse nutriente nas raízes do capim.Palavras-chave: gramínea forrageira, macronutrientes, Panicum maximum, sistema radicular Influence of nitrogen and calcium fertilizations on morphological and productive characteristics of tanzania guineagrass roots grown in nutrient solutionABSTRACT -Root traits of Panicum maximum Jacq. Cv. Tanzânia were evaluated in response to a nutritive solution with combinations of nitrogen and calcium rates. Ground quartz was used as substrate in an experiment carried out in a greenhouse in the spring, using a complete randomized block design, with four replications, in a fractionated 5 2 factorial scheme, with 13 combinations of nitrogen and calcium, in mmol/L: 2-0.5; 2-3.0; 2-5.5; 9-1.75; 9-4.25; 16-0.5; 16-3.0; 16-5.5; 23-1.75; 23-4.25; 30-0.5; 30-3.0, and 30-5.5. After the third harvest, grass roots were collected. Combination of high rates of nitrogen with low rates of calcium provided maximal dry matter yields and concentration of nitrogen in the roots. Critical levels of nitrogen and calcium in the roots of Tanzania grass were 11.07 and 1.30 g/kg, respectively.Significant correlation coefficients were found for dry mass, total length and total surface of the roots. Length and total surface and specific length and surface of the roots depend on the supply of nitrogen, but do not depend on the calcium supply. Calcium rates are determinant for this nutrient concentration in the grass roots. IntroduçãoApesar da importância das raízes na produção e na persistência das pastagens, informações na literatura a respeito da produção de biomassa e dos aspectos morfológicos do sistema radicular são escassas (Bono et al., 2000) e o conhecimento sobre o efeito do manejo no ambiente em que as raízes se desenvolvem, às vezes, é controverso (Cecato et al., 2004).Em experimentos em pastagens com avaliações do...

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“…According to Marschner and Marschner (2012), the nutrient supply can influence root system growth and distribution, and this effect is marked mainly by N. In addition, Silveira and Monteiro (2010) reported that the N supply to the aerial part is dependent on a well-developed root system.…”

Section: Discussionmentioning

confidence: 99%

Camu-camu Root Distribution under Different Nitrogen and Potassium Doses through Drip Fertigation

Melo¹,

Chagas²,

Siqueira³

et al. 2019

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Camu-camu is an native species in domestication processes. Therefore, studies related to the root system are necessary to evaluate the best cultivation practices for an orchard. Two trials were conducted, one with nitrogen (N) and the other with potassium (K), at doses of 0, 40, 80, 160, and 320 kg · ha -1 . Root distribution was determined using nondestructive analyses in which two-dimensional (2D) root images were obtained from trenches under the plants' canopy. Variables included width (measured in cubic millimeters), area (measured in square millimeters), and length (measured in millimeters, and were analyzed using Safira software (version 2010, Embrapa, Brazil). To have better spatial visualization of variable distribution in the soil profile, data were analyzed using the ordinary kriging technique with the geoR software package and R software (version 2016). Both N and K doses influenced positively the camu-camu root system with regard to length, volume, and area. Better root distribution was verified with 80 kg · ha L1 N and 160 kg · ha L1 K doses. The nondestructive analysis via 2D images allowed sound characterization of root spatial distribution.Camu-camu is an native species of the Amazon Basin that attracts attention as a result of its high content of vitamin C, reaching up to 7355 mg/100 g pulp in native populations of Roraima State (Chagas et al., 2015). It is currently considered functional food, with

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Macronutrientes em folhas diagnósticas do capim-tanzânia adubado com nitrogênio e cálcio

Cited by 7 publications

References 6 publications

Biomass and nutrient contents in Panicum maximum cultivars irrigated with fish farming effluent

Biomass and nutrient contents in Panicum maximum cultivars irrigated with fish farming effluent

Influência da adubação com nitrogênio e cálcio nas características morfológicas e produtivas das raízes de capim-tanzânia cultivado em solução nutritiva

Camu-camu Root Distribution under Different Nitrogen and Potassium Doses through Drip Fertigation

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