Doses de nitrogênio e fósforo para produção econômica de milho na Chapada do Apodi, RN

Silva, Gerônimo Ferreira da; Oliveira, Fábio Henrique Tavares de; Pereira, R. G. de A.; Silva, Paulo S. L. e; Diógenes, Talita Barbosa Abreu; Silva, Antonia R. da C.

doi:10.1590/1807-1929/agriambi.v18n12p1247-1254

Cited by 27 publications

(23 citation statements)

References 11 publications

(5 reference statements)

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“…Regarding the researches related to soil science, the response function has been used to verify the influence of water depths and fertilization levels with nitrogen and phosphorus on productive and economic yields (CARVALHO et al, 2013;PAIVA et al, 2012;SILVA et al, 2008;SILVA et al, 2012b). The response function is used to characterize how a response is influenced by a number of factors, to identify, know and analyze the maximum or minimum responses of the relationship between the response variables and the quantitative factors affecting them (CUSTÓDIO; MORAIS; MUNIZ, 2000).…”

Section: Introductionmentioning

confidence: 99%

Response Function for the Srelative Index in Cambisol Treated With and Without Bovine Liquid Biofertilizer

et al. 2018

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The present study aimed at assessing the influence of physical properties associated with soil structure on the S relative index. Two soil conditions under Ficus carica L. cultivation were studied (with or without liquid bovine biofertilizer in the irrigation water), in the 0-0.1 m and 0-0.3 m layers. Disturbed and undisturbed soil samples were collected from the above-mentioned layers and physical analyzes, pertinent to the study objective, were performed. The response function model was applied to verify how the soil independent physical variables influence on the S relative index in the 0-0.1 m and 0-0.3 m layers, with 0 and 60% biofertilizer, being combined two to two. Once the response functions were known, the slopes of both functions were compared, being represented by the coefficients β11-β12 and β21-β22. This comparison enabled verifying whether there was an effect of the treatments on the response variable. In addition, the standard error of the difference between coefficients was calculated, and the Student's t-test applied. The method of multiple regression was also used to confirm the effect of the variables on the S relative index for the 0-0.3 m layer in both treatments. Then, the variables with greater weight were selected by a backward elimination method to estimate the S relative . The results showed that the S relative index is strongly influenced by properties of the porous fraction, with total porosity and continuity of pores being of significant influence. Management with liquid bovine biofertilizer results in improvement in the soil structure, with effects measured by the S relative index.Keywords: S index. Soil structure. Organic matter. FUNÇÃO DE RESPOSTA PARA O ÍNDICE S RELATIVO EM CAMBISSOLO TRATADO COM E SEM BIOFERTILIZANTE LÍQUIDO BOVINORESUMO -Objetivou-se com esta pesquisa estudar a influência de atributos físicos associados à estrutura do solo no índice S relativo . Foram contempladas duas situações de solo (sob cultivo de Ficus carica L., sem aplicação e com aplicação de biofertilizante bovino líquido na lâmina de irrigação), nas camadas de 0-0,1 m e 0 -0,3 m. Foram coletadas amostras de solo com estrutura preservada e não preservada nas camadas supracitadas e realizadas análises físicas pertinentes ao objetivo do estudo. Foi aplicado o modelo de função de resposta para verificar como as variáveis físicas do solo independentes influenciam no S relativo , nas camadas de 0-0,1 m e 0-0,3 m tratadas com 0 e 60 % do biofertilizante combinadas duas a duas. Conhecidas as funções de resposta compararam-se as inclinações de ambas as funções, representadas pelos coeficientes β 1 1-β 1 2 e β 2 1-β 2 2, para verificar se houve efeito dos tratamentos na variável resposta. Além disso, calculou-se o erro padrão da diferença entre os coeficientes e aplicou-se o teste t de Student. Também foi aplicado o método de regressão múltipla para verificar o efeito das variáveis sobre o S relativo para a camada de 0-0,3 m em ambos os tratamentos. Em seguida, por meio do método backward elimination foram sel...

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Section: Introductionmentioning

confidence: 99%

Response Function for the Srelative Index in Cambisol Treated With and Without Bovine Liquid Biofertilizer

et al. 2018

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“…The equation model which best adjusted to the data of P in the soil was the positive linear ( Figure 2). The increase of the content of P in the soil in the presence of nitrogen was also obtained by Silva et al (2014). However, the increase of P content in the soil according to the doses of P 2 O 5 applied, in the presence of nitrogen fertilizer, did not reflect in significant increase in nutrient concentration in the plant, which is possibly due to the effect of the dilution of the nutrient according to the greatest production of marketable unhusked ears.…”

mentioning

confidence: 71%

Nitrogen and phosphate fertilizer on green corn grown in succession to the melon crop

et al. 2016

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Melon producers, in Chapada do Apodi, Rio Grande do Norte State, Brazil, located between the states of Ceará and Rio Grande do Norte, have cultivated corn in succession to the melon crop. However, this crop rotation is not yet evaluated on the extent to which the residual effect of nitrogen and phosphate fertilization carried out in melon can supply partially or completely the corn demands of nitrogen and phosphorus. This work aimed to evaluate the effect of nitrogen (N) and phosphorus (P) in the production of corn in succession to the cultivation of melon (Cucumis melo) irrigated in an Alkaline Inceptisol of Chapada do Apodi. Ten treatments from the combinations between five N rates (0; 45; 90; 160 and 220 kg/ha) and four levels of P 2 O 5 (0; 40; 80; and 120 kg/ha) were compared. The experimental design was a randomized block with four replications. The corn cultivar was the hybrid AG 1051 and the characteristics evaluated were number and total weight of ears, number and weight of marketable unhusked ears and concentrations of N and P in plant and P in the soil. This study also estimated critical levels of N and P in the plant and P in the soil. Producing green corn in succession to melon is viable, in this experiment conditions, without application of nitrogen and phosphorus to the soil. However, for maximum corn productivity, application of 90 kg/ha N combined with 40 kg/ha P 2 O 5 is recommended. The average critical level of N and P in the plant for corn production was 32.29 and 4.31 g/kg, respectively. This value for P in the soil was 20.7 mg/dm 3 .

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“…It should also be emphasised that the levels of phosphorus influenced cob productivity. As such, Silva et al (2014) point out that the levels of nitrogen and phosphorus in the soil are essential for increasing maize productivity.…”

Section: Resultsmentioning

confidence: 99%

Chemical attributes of the soil and agronomic characteristics of maize as a monocrop and intercropped with herbaceous and woody legumes in the savannah of Roraima, Brazil

Silva¹,

Silva²,

Nunes³

et al. 2019

Afr. J. Agric. Res.

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Several studies seek to identify management systems that promote an increase in soil quality. As such, the aim of this study was to evaluate the effect of combinations of herbaceous and woody legumes on the productivity of green maize and the chemical attributes of the soil. The research was developed over two crop years (2016 and 2017). The experimental design was of randomized complete blocks with three replications and subdivided plots, in a 2 × 5 factorial scheme, representing the presence and absence of an alley cropping system with gliricidia, and five intercrops of maize with legumes: Maize + jack bean planted at the same time; maize + pigeon pea planted at the same time; maize + velvet bean planted 15 days after the maize; maize + Crotalaria juncea planted at the same time; single maize crop. The alley system increases the total and commercial productivity of husked cobs in maize intercropped with velvet bean. Intercropping maize with legumes under an alley system helps to increase the levels of phosphorus and potassium in the soil. Irrespective of the type of intercrop, green manure with legumes increases the soil organic matter content of farmed land in Roraima.

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Doses de nitrogênio e fósforo para produção econômica de milho na Chapada do Apodi, RN

Cited by 27 publications

References 11 publications

Response Function for the Srelative Index in Cambisol Treated With and Without Bovine Liquid Biofertilizer

Response Function for the Srelative Index in Cambisol Treated With and Without Bovine Liquid Biofertilizer

Nitrogen and phosphate fertilizer on green corn grown in succession to the melon crop

Chemical attributes of the soil and agronomic characteristics of maize as a monocrop and intercropped with herbaceous and woody legumes in the savannah of Roraima, Brazil

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