Forage mass, chemical composition and leaf chlorophyll index of signal grass and organic matter in soil under increasing levels of nitrogen

Souza, Igor Alexandre de; Ribeiro, Karina Guimarães; Rocha, Wellington Willian; Araújo, Saulo Alberto do Carmo; Pereira, Odilon Gomes; Cecon, Paulo Roberto

doi:10.5433/1679-0359.2016v37n3p1505

Cited by 7 publications

(8 citation statements)

References 10 publications

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“…This is because the greater availability of nitrogen in the soil due to fertilization increased the soluble nitrogen rates in the composition of the forage plants, enhancing synthesis of the chlorophyll molecule . Furthermore, the increase in the relative chlorophyll contents of the grasses is positively correlated with the production of dry matter and plant height, underscoring the crucial relevance of fertilization in the plants' production characteristics.…”

Section: Discussionmentioning

confidence: 59%

“…Several authors have obtained favorable results with fertilization of the genotypes/cultivars studied, due to an increase in nitrogen, phosphorus, which is highly important in the formation of the root system of grasses and shoots, and potassium, which, according to Chaboussou, is an essential element for plant development and metabolism, due to its active participation in biochemical processes, enzyme activation and protein synthesis.…”

Section: Discussionmentioning

confidence: 99%

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Tolerance to nymphs and adults of Mahanarva spectabilis (Hemiptera: Cercopidae) by forage plants in fertilized soils

Alvarenga

Auad

Moraes

et al. 2019

Pest Management Science

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BACKGROUND: Several factors may degrade pastures, in particular, inadequate nutrient application and spittlebug attacks. Mahanarva spectabilis (Distant, 1909) (Hemiptera: Cercopidae), one of the species that occur in Brazil, is a limiting pest in forage production. This study analyzes the influence of fertilization with the macronutrients nitrogen, phosphorus and potassium (NPK) on the survival of M. spectabilis nymphs, and the effects of damage by nymphs and adults on the production, quality and regrowth capacity of the forages Brachiaria ruziziensis, Pennisetum purpureum and Digitaria sp. RESULTS: Fertilization of the forages differentially affected damage due to spittlebug herbivory. Attacks by nymphs and adults decreased chlorophyll content, plant regrowth and forage quality, and increased injury, regardless of fertilization. The availability of nutrients in the soil not only decreased fiber content, but also increased crude protein, chlorophyll content and regrowth, even when pest infested. Soil fertilization increased the capacity of forage plants to lessen, albeit not eliminate, the effects of injury by M. spectabilis. CONCLUSION: Forages in fertilized soil are more tolerant to attacks by M. spectabilis nymphs and adults.

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Section: Discussionmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Tolerance to nymphs and adults of Mahanarva spectabilis (Hemiptera: Cercopidae) by forage plants in fertilized soils

Alvarenga

Auad

Moraes

et al. 2019

Pest Management Science

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“…This response, however, was not reflected in an increase in forage mass production. Due to the high correlation between the SPAD chlorophyll content and gross leaf protein content in grasses (Souza et al., ), the application of N after the appearance of the first leaf probably improves the nutritive value of the forage. However, further research is needed to confirm such a hypothesis.…”

Section: Discussionmentioning

confidence: 99%

“…SPAD chlorophyll content increased linearly with the N dose (Figure b). As N is a fundamental nutrient for chlorophyll synthesis, an increase in the chlorophyll content in response to N fertilization has been observed in several grasses (Argenta et al., ; Souza et al., ).…”

Section: Discussionmentioning

confidence: 99%

Productive and morphophysiological responses of Panicum maximum Jacq. cv. BRS Zuri to timing and doses of nitrogen application and defoliation intensity

et al. 2019

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The response of plants to nitrogen fertilization is subject to several factors, including the level of stress caused by defoliation. After defoliation, the plant needs to adjust its energy balance to meet the demands of shoot and root recovery. Our objective was to evaluate the production of forage mass and other morphophysiological responses of zurigrass (Panicum maximum cv. BRS Zuri) subjected to five nitrogen doses (0, 20, 40, 60 and 80 mg/dm3) that were applied at two stages (after the cut and after the appearance of the first leaf on the tiller) under two defoliation intensities (15 and 30 cm of residual height). The pot experiment was conducted in a greenhouse in a completely randomized design with three replications, and the forage mass, as well as other morphophysiological traits, was measured in three regrowth cycles after the first standardization cut. Moreover, to understand the effect of cutting height on the root system, the root mass and root carbohydrate content were evaluated at zero, seven and 14 days after the standardization cut. The root mass reduced after 7 days since cutting under the low residual height (15 cm), but no effects on the root carbohydrate content were observed. The dose of nitrogen had a marked effect on most of the variables analyzed, leading to a linear increase in the root mass, the SPAD chlorophyll content and the harvested forage mass, whereas the number of tillers increased quadratically in response to the nitrogen dose. An increase was observed in the harvested forage mass for plants under the 15 cm of residue treatment compared with those under the 30‐cm treatment (16.0 vs. 13.6 g/pot), but no effect was observed for the time of nitrogen application.

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“…This determination is made by a chlorophyll meter, and it is a method of early diagnosis of N deficiency, performed quickly, instantaneously and non-destructively (SOUZA et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Nitrogen Monitoring, Bud Fertilityand ‘Thompson Seedless’ Grapevine Production on Different Rootstocks

et al. 2017

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ABSTRACT-Methods of nitrogen analysis were adopted in leaf tissues in the laboratory, nitrate content in the sap of petioles and chlorophyll relative index (CRI, in SPAD unit), as well as the evaluation of the buds fertility rates, production and qualitative aspects of cluster and berries of 'Thompson Seedless' vine, grafted on rootstocks 'Harmony', 'Jales' 'Paulsen 1103' and 'SO4'. The applied dose of N was 80 kg ha -1 , and the experiment was installed in the Submédio do Vale do São Francisco, Brazil. The experiment was performed in a randomized blocks design, with four treatments and five replicates, with the experimental plot represented by five plants. In addition to the analysis of N, cluster length and width (cm) and fresh mass (g), berries length, diameter (mm), volume (mL), mass of fresh matter of berries, soluble solids (SS), titratable acidity (TA), SS/TA ratio, potential bud fertility (productive, vegetative, dead and dark buds in %) and real bud fertility (%). There were differences in nitrogen content in the leaves, nitrate in sap and CRI of 'Thompson Seedless' in relation to rootstocks. 'Thompson Seedless' expressed better potential for the development of clusters and berries when grafted on 'Harmony'. Index terms: Vitis vinifera (L.); plant nutrition; buds fertility; viticultura tropical irrigada AVALIAÇÃO DE NITROGÊNIO, FERTILIDADE DE GEMAS E PRODUÇÃO DA VIDEIRA 'THOMPSON SEEDLESS' SOBRE DIFERENTES PORTA-ENXERTOSRESUMO -Adotaram-se métodos de análise de N em tecidos de folhas em laboratório, teores de nitrato na seiva de pecíolos e o índice relativo de clorofila (IRC, em unidade SPAD), bem como foram avaliados as taxas de fertilidade de gemas, os aspectos produtivos e qualitativos de cachos e bagas da videira 'Thompson Seedless', enxertada sobre os porta-enxertos 'Harmony', 'Jales' 'Paulsen 1103' e 'SO4'. A dose de N aplicada foi de 80 kg ha -1 , e o experimento foi instalado no Submédio do Vale do São Francisco, Brasil. O delineamento experimental utilizado foi blocos ao acaso, com quatro tratamentos e cinco repetições, sendo que a parcela experimental foi constituída por cinco plantas. Além das análises de N pelos métodos citados, avaliaram-se comprimento e largura (cm) e massa fresca de cacho (g), comprimento, diâmetro (mm), volume (mL), massa da matéria fresca de bagas (g), teor de sólidos solúveis (SS), acidez titulável (AT), relação SS/AT, fertilidade de gemas potencial (gemas frutíferas, vegetativas, mortas e escuras, em %) e fertilidade de gemas real (%). Verificaram-se diferenças entre teores de nitrogênio na folha, nitrato na seiva e IRC da 'Thompson Seedless' em relação aos porta-enxertos, e quando enxertada sobre o 'Harmony', a 'Thompson Seedless' expressou melhor potencial para o desenvolvimento de cachos e bagas. Termos para indexação: Vitis vinifera (L.); nutrição de plantas; fertilidade de gemas; viticultura tropical irrigada..1 (Paper 069-16).

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Forage mass, chemical composition and leaf chlorophyll index of signal grass and organic matter in soil under increasing levels of nitrogen

Cited by 7 publications

References 10 publications

Tolerance to nymphs and adults of Mahanarva spectabilis (Hemiptera: Cercopidae) by forage plants in fertilized soils

Tolerance to nymphs and adults of Mahanarva spectabilis (Hemiptera: Cercopidae) by forage plants in fertilized soils

Productive and morphophysiological responses of Panicum maximum Jacq. cv. BRS Zuri to timing and doses of nitrogen application and defoliation intensity

Evaluation of Nitrogen Monitoring, Bud Fertilityand ‘Thompson Seedless’ Grapevine Production on Different Rootstocks

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