Capacidade de um sensor ótico em quantificar a resposta da cana-de-açúcar a doses de nitrogênio

Molin, José Paulo; Frasson, Flavia Roncato; Amaral, Lucas Rios do; Povh, Fabrício Pinheiro; Salvi, José Vitor

doi:10.1590/s1415-43662010001200014

Cited by 18 publications

(16 citation statements)

References 13 publications

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“…The development of specialized equipment enabling variable rate application creates new opportunities for the timing of fertilizer application using information obtained from canopy sensors [163]. The use of close remote sensing (optical sensors attached to agricultural machinery) assumes that leaf spectral properties, such as reflectance and transmittance, are affected by N deficiency [164].…”

Section: Timing Of Fertilizer Applicationmentioning

confidence: 99%

Nitrogen Use Efficiency for Sugarcane-Biofuel Production: What Is Next?

Otto

Castro

Mariano³

et al. 2016

Bioenerg. Res.

102

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Land area devoted to sugarcane (Saccharum spp.) production in Brazil has increased from 2 million to 10 million ha over the past four decades. Studies have shown that, from an environmental perspective, the transformation of nitrogen (N) fertilizers into N 2 O gases can offset the advantages gained by replacing fossil fuels with biofuels. Our objectives here were to review recent developments in N management for sugarcane-biofuel production and assess estimates of N use efficiency (NUE) and N losses based on future scenarios, as well as for life-cycle assessments of bioenergy production. Approximately 60 % of N-based fertilizer applied to sugarcane fields in Brazil is recovered by plants and soils, whereas N losses to leaching and N 2 O emissions can average 5.6 and 1.84 % of the total applied N, respectively. Maintenance of trash, rotation with N-fixing legume species, and optimization of byproducts usage have potential for reducing the N requirements of sugarcane cultivation in Brazil. Moreover, the development of sugarcane genotypes with higher NUEs, along with management systems that consider soil capacity of mineralization, is required for improving the NUE of sugarcane. Strategies to maintain N as NH 4 + in sugarcane-cropped soils also have the potential to reduce N losses and enhance NUE. The development of secondgeneration biofuels is important for increasing biofuel production while simultaneously maintaining N rates and improving NUE, and sugarcane systems in Brazil show potential for sustainable biofuel production with low N rates and limited N 2 O losses. Reducing N rates in sugarcane fields is thus necessary for improving sugarcane-based biofuel production and reducing its environmental impacts.

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Section: Timing Of Fertilizer Applicationmentioning

confidence: 99%

Nitrogen Use Efficiency for Sugarcane-Biofuel Production: What Is Next?

Otto

Castro

Mariano³

et al. 2016

Bioenerg. Res.

102

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“…Since the canopy sensor is capable of identifying the effect of N supply at an early sugarcane growth stage (Molin et al, 2010;Amaral & Molin, 2011), which tends to be related to stalk production, it is also possible to use this device to determine the ideal N rate to be applied during crop growth, focusing on both maximum production and optimal economic return (Kitchen et al, 2010). In order to achieve this, it would be necessary to measure the crop response to N during the growing season.…”

Section: Methodsmentioning

confidence: 99%

“…In a pioneer study in Brazil, Molin et al (2010) found that a canopy sensor was able to differentiate N rates applied to sugarcane, whereas in the USA, Lofton et al (2012a) showed that the response of stalk yield to N fertilization could be estimated by the same canopy sensor. In a more recent study, Amaral & Molin (2014) concluded that the canopy sensor was a useful device in identifying N variability within production areas, which made it possible to apply the nutrient at variable rates.…”

Section: Introductionmentioning

confidence: 99%

Sugarcane response to nitrogen rates, measured by a canopy reflectance sensor

Rosa

Amaral

Molin

et al. 2015

Pesq. agropec. bras.

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-The objective of this work was to evaluate whether a canopy sensor is capable of estimating sugarcane response to N, as well as to propose strategies for handling the data generated by this device during the decision-making process for crop N fertilization. Four N rate-response experiments were carried out, with N rates varying from 0 to 240 kg ha -1 . Two evaluations with the canopy sensor were performed when the plants reached average stalk height of 0.3 and 0.5 m. Only two experiments showed stalk yield response to N rates. The canopy sensor was able to identify the crop response to different N rates and the relationship of the nutrient with sugarcane yield. The response index values obtained from the canopy sensor readings were useful in assessing sugarcane response to the applied N rate. Canopy reflectance sensors can help to identify areas responsive to N fertilization and, therefore, improve sugarcane fertilizer management.Index terms: NDVI, nitrogen fertilization, optical sensor, precision agriculture, proximal sensing. Resposta da cana-de-açúcar a doses de nitrogênio estimada por sensor de refletância do dosselResumo -O objetivo deste trabalho foi avaliar se um sensor de dossel é capaz de estimar a resposta da cana-de-açúcar ao N, bem como propor estratégias para tratar os dados gerados pelo equipamento durante o processo de tomada de decisão para a adubação nitrogenada da cultura. Foram conduzidos quatro experimentos de dose-resposta ao N, com doses de N que variaram de 0 a 240 kg ha -1 . Duas avaliações foram realizadas com o sensor de dossel quando as plantas alcançaram altura média de colmos de 0,3 e 0,5 m. Apenas dois experimentos mostraram resposta ao N aplicado em termos de produtividade de colmos. O sensor foi capaz de identificar a resposta da cultura a diferentes doses de N e a relação do nutriente com a produtividade da cana. Os índices de resposta obtidos pelas leituras do sensor foram úteis em avaliar a resposta da cana-de-açúcar ao N aplicado. Sensores de dossel podem auxiliar na identificação de áreas responsivas à aplicação de N e, consequentemente, melhorar o manejo da fertilização nitrogenada da cana-de-açúcar.Termos para indexação: NDVI, adubação nitrogenada, sensor óptico, agricultura de precisão, sensoriamento proximal.

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“…Thus, researchers attempting to minimize these deficiencies used remote sensing through precision agriculture, aiming at the appropriate distribution with greater accuracy according to the recommended dosage (Molin et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Mechanized and Individualized Application of N-P-K in Combined Operations in Sugarcane

et al. 2017

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ABSTRACT:A new concept of fertilizer machine is under development and shows as differential individually fertilizer application, that is sources of N, P and K are applied separately for the purpose of improving the distribution efficiency of the quantities applied. The aim was to compare the quality of the individualized mechanized distribution of N, P and K in combined operations with and without herbicide application, as well as to evaluate the fertilizer application on each side of the fertilizer machine. The experiment was carried out on Cascavel farm, in the municipality of Matão-SP. The experimental design was established according to the criteria of quality control, and variables monitoring carried out in the place during fertilization operation, having the fertilizer distribution operation; simultaneous operation of fertilizer distribution and herbicide application treatments; and two simple operations, fertilizer distribution followed by herbicide application. We concluded that the better operational quality was in two distinct operations. The right side of the fertilizer had the best result because it applied the amount close to the regulated dosage. The distribution of potassium chloride expressed in the control charts greater operational quality compared to other fertilizers.

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Capacidade de um sensor ótico em quantificar a resposta da cana-de-açúcar a doses de nitrogênio

Cited by 18 publications

References 13 publications

Nitrogen Use Efficiency for Sugarcane-Biofuel Production: What Is Next?

Nitrogen Use Efficiency for Sugarcane-Biofuel Production: What Is Next?

Sugarcane response to nitrogen rates, measured by a canopy reflectance sensor

Mechanized and Individualized Application of N-P-K in Combined Operations in Sugarcane

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