Índices de cor da folha para monitoramento nutricional de nitrogênio em plantas de pimentão

Felisberto, Patrícia Aparecida de Carvalho; Godoy, Leandro José Grava de; Felisberto, Guilherme

doi:10.15361/1984-5529.2016v44n2p207-216

Cited by 3 publications

(4 citation statements)

References 17 publications

(23 reference statements)

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“…Digital agriculture is recognized as a technological innovation tool because it improves economic and management aspects when applied preventively during agricultural production, minimizing losses of agricultural inputs and environmental risks, in addition to maximizing the use of fixed assets (machinery, equipment, and implements) in relation to conventional agriculture (Felisberto et al, 2016;Bernardi et al, 2017;Machado et al, 2018).…”

Section: Resultsmentioning

confidence: 99%

Economic viability of a monitoring system in mechanized citrus production

Silva¹,

Santos²,

Vidal³

et al. 2020

Científica

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Digital agriculture is currently the main technological paradigm in agribusiness, in which one of the main challenges is the convergence of new monitoring technologies with the management of the volume of information generated to increase productivity. This research analyzes the economic viability of a monitoring system deployed on eight tractors and two trucks used for spraying operations in a citrus farm. The operations covered an area of 2,236 ha and were performed during the 2016/2017 harvest. The economic results of the investment were examined using the discounted cash flow method associated with the Monte Carlo simulation. The monitoring system provided greater availability and quality of information, which improved the quality of operations management. The results pointed to 23.67% lower costs per hectare in monitored compared to unmonitored areas. Economic analysis demonstrated the viability of the investment with 99.5% confidence, whose gain in Net Present Value per machine represents 15% of the machine acquisition cost. The results of this study are pioneering for mechanized citrus operations and denote the importance of investments in automated digital monitoring systems that allow better monitoring of management activities in orange production.

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Section: Resultsmentioning

confidence: 99%

Economic viability of a monitoring system in mechanized citrus production

Silva¹,

Santos²,

Vidal³

et al. 2020

Científica

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“…Bell pepper cultivation is usually difficult and fruit production is not always satisfactory. Nitrogen and potassium are some of the nutrients most extracted by bell pepper plants, which contribute to plant growth and fruit quality (Felisberto et al, 2016;Zeist et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Desempenho de cultivares de pimentão colorido sob diferentes concentrações de solução nutritiva

et al. 2022

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O conhecimento da exigência nutricional da cultura sobre sistemas de cultivo adaptados a realidades locais, além da adequada disponibilidade de nutrientes em solução nutritiva é de fundamental importância tanto para o crescimento da planta quanto para a produção de frutos de qualidade. Assim, o objetivo foi avaliar o desempenho produtivo de cultivares de pimentão colorido em sistema semi-hidropônico sob diferentes concentrações nutritivas. O delineamento experimental utilizado foi o inteiramente casualizado, em parcelas subdivididas, com tratamentos arranjados em esquema fatorial 3 x 3, consistindo em três cultivares de pimentão e três concentrações de solução nutritiva, 75%, 100% e 125%, com quatro repetições, totalizando 36 unidades experimentais. A cultivar utilizada foi a All Big e os híbridos Sucesso e Beti-R. A concentração de nutrientes em 75% da solução nutritiva utilizada influenciou diretamente na produtividade total dos híbridos Beti-R e Sucesso, apresentando 24,25 t ha-1 e 17 t ha-1, respectivamente. A concentração padrão em 100% proporcionou maiores resultados para a cultivar All Big. Quantidades superiores de nutrientes afetam o desenvolvimento e a produtividade da cultura do pimentão, sendo fundamental a utilização da correta concentração de nutrientes para obter melhores e maiores resultados de acordo com cada cultivar.

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“…In this context, digital image processing is a plausible technological option, capable of predicting the nutritional status of N in a simple and fast way, in comparison with laboratory analyses, based on the parameters of hue and dark green color index (DGCI) (Felisberto et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…). According toFelisberto et al (2016), the hue of the leaf digital image was significantly influenced by N concentrations, rangingfrom 75.1 to 149.7 degrees in studies 51, 79, 93, 107, 121 and 149 days after transplantation, at 5; 10; 15; 20 and 25g of N for the pepper plant. The authors also mention that the lowest hue values corresponded to plants with N deficiency.…”

mentioning

confidence: 99%

Digital imaging of coffee leaves under different nitrogen concentrations applied to soil

Godoy

Carvalho

Freitas³

et al. 2022

Rev. Ceres

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Brazil is the largest Coffea arabica L. producer and exporter in the world market. In view of the need for nitrogen fertilization, the objective of this work was to evaluate the use of digital images of coffee leaves as a function of nitrogen concentration and cultivars, as well as to evaluate the most adequate sampling of this technique to predict leaf nitrogen. The experiment was set in a greenhouse, at UNESP -Experimental Campus of Registro-SP, using 12L pots with medium sand. A completely randomized design was adopted, in a 4 x 2 factorial scheme, with four concentrations of N (0, 50, 100 and 200 mg dm -3 ), and two coffee cultivars (Mundo Novo and Obatã), with ten replications.The variables evaluated were: hue, dark green color index (DGCI), leaf area and leaf nitrogen content. The hue and DGCI were influenced by N concentration, cultivar and are dependent on the day after treatment application and the number of leaves used. The use of five leaves per replication was more adequate to estimate leaf N content. Hue, DGCI and leaf area were higher in Obatã depending on the day after application of the treatment and N concentration.

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Índices de cor da folha para monitoramento nutricional de nitrogênio em plantas de pimentão

Cited by 3 publications

References 17 publications

Economic viability of a monitoring system in mechanized citrus production

Economic viability of a monitoring system in mechanized citrus production

Desempenho de cultivares de pimentão colorido sob diferentes concentrações de solução nutritiva

Digital imaging of coffee leaves under different nitrogen concentrations applied to soil

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