Influência do nitrato e do amônio sobre a fotossíntese e a concentração de compostos nitrogenados em mandioca

Cruz, Jailson Lopes; Pelacani, Claudinéia Regina; Araújo, Wagner L.

doi:10.1590/s0103-84782008000300008

Cited by 10 publications

(8 citation statements)

References 20 publications

(8 reference statements)

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“…For the factor proportions of nitrate-N and ammonium-N, based on the comparison of means ( Figure 3B Thus, the lower WC of sesame plants cultivated exclusively with ammonium has been related to the negative alteration caused in the intracellular water potential due to the greater resistance to water flow in the roots, resulting from the reduction in the osmotic potential and hormonal production of the plants (Cruz et al, 2008).…”

Section: Dmentioning

confidence: 98%

“…In the soil solution, N can be found in the forms of nitrate and ammonium, and the preferential form of absorption and assimilation depends on the plant species (Duan et al, 2007). In addition, the absorption rates of NO 3 -and NH 4 + by plants can be influenced by various factors, such as species, NO 3 -:NH 4 + proportion in the solution, pH, temperature, luminosity intensity, concentration of carbohydrates in the roots, among others (Cruz et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Cultivation of CNPA G3 sesame irrigated with saline water and fertilized with nitrate-N and ammonium-N

Lima

Soares

Gheyi

et al. 2017

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe study aimed to evaluate the effects of irrigation with saline water and fertilization with nitrate (NO 3 --N) and ammonium (NH 4 + -N) ratios on growth, flowering, water consumption and water use efficiency of the sesame cv. CNPA G3. The treatments were distributed in randomized blocks in a 5 x 5 factorial with three replicates, referring to five levels of electrical conductivity of the irrigation water -ECw (0.6, 1.2, 1.8, 2.4 and 3.0 dS m

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Section: Dmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Cultivation of CNPA G3 sesame irrigated with saline water and fertilized with nitrate-N and ammonium-N

Lima

Soares

Gheyi

et al. 2017

Rev. bras. eng. agríc. ambient.

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“…Apesar de causar o branqueamento às folhas da mandioca o mesotrione não promoveu reduções significativas dessa variável em nenhuma das cultivares. A manutenção da AF pelas plantas de mandioca é uma característica desejada, pois segundo Cruz & Pelacani (1993) a queda dessa variável e, consequentemente, a redução no índice de área foliar estão diretamente relacionados a reduções no acúmulo de matéria seca pelas raízes e parte área da cultura e atraso na formação e diminuição no crescimento da raiz tuberosa. …”

Section: (%)unclassified

Sensibilidade de cultivares de mandioca ao herbicida mesotrione

Silveira

Silva²,

Santos

et al. 2012

RBHerbicidas

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Resumo -O manejo inadequado das plantas daninhas é um dos principais fatores responsáveis pela baixa produtividade média de raízes da mandioca no Brasil. Nessa cultura, o método mecânico de controle das plantas daninhas é o mais utilizado em decorrência da baixa disponibilidade de herbicidas registrados para a mandioca. Na busca de alternativas para este problema este trabalho que teve como objetivo avaliar a tolerância de cultivares de mandioca à aplicação em pós-emergência de mesotrione. Para isso foi conduzido um experimento em casa de vegetação, em delineamento de blocos casualizados com quatro repetições. Adotou-se arranjo fatorial em esquema 5x5, constituído pela combinação de cinco doses do herbicida mesotrione e cinco cultivares de mandioca. Avaliou-se semanalmente a fitotoxicidade, altura, diâmetro de caule e número de folhas das plantas, e aos 35 dias após a aplicação (DAA) coletaram-se as plantas para determinação da matéria seca e área foliar das plantas. Os maiores valores de intoxicação visual foram observados aos 14 e 28 DAA, provocados pelas maiores doses do mesotrione. Estes sintomas consistiram em leve branqueamento das folhas mais novas das plantas. Aos 35 DAA as plantas apresentaram recuperação dos sintomas, principalmente pelo surgimento de novas folhas. Em nenhuma das doses avaliadas o mesotrione afetou as variáveis: altura, diâmetro do caule, número de folhas, área foliar e acúmulo de matéria seca de folha, caule, raízes e total; evidenciando a tolerância dos cultivares de mandioca ao herbicida. Palavras-chave: Manihot esculenta, crescimento, seletividade, manejo químico Abstract -Unsuitable weed management is one of the main factors responsible for low mean yield of cassava (Manihot esculenta Crantz) in Brazil. In this crop, mechanical weed control is the most commonly used, due to the lack of registered herbicides for cassava crop. In the search for alternatives to this problem, this work aimed to evaluate the tolerance level of cassavas cultivars to mesotrione herbicide applied in post emergence. A experiment was conducted, in green house conditions, in randomized blocks with four replications. A factorial scheme 5x5 was adopted, consisting of the combination of five dosages of mesotrione herbicides and five cassava 1 Recebido para publicação em 23/12/2011 e aceito em 22/02/2012.

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“…The negative influence of nitrogen deficit on photosynthetic rate has been observed for several species and might be explained by the fact that the application of this nutrient determines the formation of compounds related to photosynthesis such as electron carriers and Rubisco (Evans, 1989). Additionally, optimal concentrations of nitrogen may be required to maintain carboxilative rubisco activity (Cruz et al, 2008). Plants grown with an inefficient supply of N may have a significant increase in starch concentration in chloroplasts Cruz et al (2004).…”

Section: Instantaneous Efficiency Of Carboxylationmentioning

confidence: 99%

Ecophysiological aspects of Tachigali vulgaris seedlings using different sources and doses of nitrogen

Simões¹,

Palheta²,

Costa³

et al. 2018

Aust J Crop Sci

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This study aimed to evaluate the effects of sources and increasing doses of nitrogen on growth and gas exchange in plants of Tachigali vulgaris. The experiment was conducted in a greenhouse in the period from April to July 2015. The experimental design was randomized blocks in a factorial scheme (4 x 5), corresponding to 4 sources and 5 doses with four replications. The seedlings were grown in pots containing 3 dm 3 of soil. Nitrogen sources such as urea [(NH₂)₂CO], ammonium nitrate (NH4NO3), ammonium sulfate [(NH4) 2SO4] and calcium nitrate [Ca (NO3)2] were tested in five doses of 0, 75, 150, 225 and 300 mg/dm³. They were applied as a solution in four portions, 25, 50, 75 and 100 days after transplanting. The lower growth of cultivated plants may be associated with N-NH 4 + and lower photosynthetic activity, especially due to negative action of this ion on stomatal conductance. The occurrence of this ion resulted in lower growth and biomass production. Based on the results, for the production of tachibranco seedlings (Tachigali vulgaris) dose of 150 mg dm-3 of N applied in installments, 25, 50, 75 and 100 days, by applying ammonium nitrate is recommended.

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Influência do nitrato e do amônio sobre a fotossíntese e a concentração de compostos nitrogenados em mandioca

Cited by 10 publications

References 20 publications

Cultivation of CNPA G3 sesame irrigated with saline water and fertilized with nitrate-N and ammonium-N

Cultivation of CNPA G3 sesame irrigated with saline water and fertilized with nitrate-N and ammonium-N

Sensibilidade de cultivares de mandioca ao herbicida mesotrione

Ecophysiological aspects of Tachigali vulgaris seedlings using different sources and doses of nitrogen

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