Mechanical properties of lettuce (Lactuca sativa L.) for horticultural machinery design

Xavier, Reuel Scherrer; Galvão, Cezário Benedito; Rodrigues, Ruan Lessa; García, Ángel Pontín; Albiero, Daniel

doi:10.1590/1678-992x-2020-0249

Cited by 4 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the levelized cost of energy should not be the only criterion because it does not encompass all the benefits and costs of the use of each technology (Dutra & Tolmasquim, 2002). Table 8 shows a qualitative analysis of different renewable energy methods and their main characteristics that can be used to support a more strategic analysis if the Government and R&D issues are regarded as indicated by Xavier et al (2022).…”

Section: Resultsmentioning

confidence: 99%

Geothermal Energy: An Alternative to the Water–energy Dilemma in Northeastern Brazil

et al. 2023

Self Cite

View full text Add to dashboard Cite

This paper proposes geothermal energy as an alternative solution to the water-energy dilemma in the northeastern region of Brazil (NEB). The main application of this study was to provide a theoretical basis to support a different approach to policies minimizing water scarcity and ensuring sustainability. The analysis developed in this study compares the levelized cost of electricity (LCOE) for many different energy sources. The novelty of this study is the use of geothermal energy in the context of the Brazilian Northeast, focusing on water desalination processes, which are expensive in terms of energy. Therefore, this study is highly important because it offers the potential of addressing the energy/economic barrier related to water desalination in environments with economically viable geothermal energy. This is the case in Northeast Brazil with potential for reuse of abandoned oil wells. In the form of enhanced geothermal systems (EGS), geothermal energy is a competitive energy source compared to other sources in the Brazilian Energy Matrix, especially when considering factors in addition to the economic benefits. In the form of EGS, geothermal energy is a suitable option for addressing water scarcity in the northeast region in a sustainable and low-emission manner. This is a strategic opportunity for NEB in the context of energy production and freshwater production through desalination.

show abstract

Section: Resultsmentioning

confidence: 99%

Geothermal Energy: An Alternative to the Water–energy Dilemma in Northeastern Brazil

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…Idso [ 7 ] and Xavier [ 5 ] also stated that the shape and size of the leaves could affect the angular and linear coefficients of the NWSB, something relevant in this work since the data were collected every 10 min throughout the entire crop cycle. Due to different water requirements, the plant development stage also affects these coefficients [ 7 ].…”

Section: Methodsmentioning

confidence: 99%

“…Among the ways to detect water stress, methods that measure soil water tension, stomatal conductance potential, and sap flow stand out [ 4 , 5 ]. Soil water tension indicates the energy with which water is retained in the soil matrix and is, therefore, an indirect measure of the water stress to which the plant is subjected [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Water Stress Index Detection Using a Low-Cost Infrared Sensor and Excess Green Image Processing

Paulo

García

Umezu

et al. 2023

Sensors

Self Cite

View full text Add to dashboard Cite

Precision Irrigation (PI) is a promising technique for monitoring and controlling water use that allows for meeting crop water requirements based on site-specific data. However, implementing the PI needs precise data on water evapotranspiration. The detection and monitoring of crop water stress can be achieved by several methods, one of the most interesting being the use of infra-red (IR) thermometry combined with the estimate of the Crop Water Stress Index (CWSI). However, conventional IR equipment is expensive, so the objective of this paper is to present the development of a new low-cost water stress detection system using TL indices obtained by crossing the responses of infrared sensors with image processing. The results demonstrated that it is possible to use low-cost IR sensors with a directional Field of Vision (FoV) to measure plant temperature, generate thermal maps, and identify water stress conditions. The Leaf Temperature Maps, generated by the IR sensor readings of the plant segmentation in the RGB image, were validated by thermal images. Furthermore, the estimated CWSI is consistent with the literature results.

show abstract

“…The parameterization must happen that way so that the normalization of temperatures does not occur in a displaced way, causing the lower and upper limits of (TF-TA) are outside the actual range of temperature variation. [5,46] also stated that the shape and size of the leaves could affect the angular and linear coefficients of the NWSB, something relevant in this work since the data were collected every 10 minutes throughout the entire crop cycle. Due to different water requirements, the plant development stage also affects these coefficients [9].…”

Section: Authorsmentioning

confidence: 99%

“…The detection of water stress is vital in Precision Irrigation (PI) management to ensure that plants are not subjected to stress levels that excessively restrict productivity or even production quality [1][2][3]. Among the ways to detect water stress, methods that measure soil water tension, stomatal conduction potential, and sap flow stand out [4,5]. Soil water tension indicates the energy with which water is retained in the soil matrix and is, therefore, an indirect measure of the water stress to which the plant is subjected [6].…”

Section: Introductionmentioning

confidence: 99%

Water Stress Index Detection Using a Low-Cost Infrared Sensor and Excess Green Image Processing

Paulo¹,

García²,

Umezu³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

So that the levels of water stress are not harmful to the development of the crop and affect its productivity, its detection and monitoring are necessary, and it can occur in different ways. One of them is through the Crop Water Stress Index (CWSI). This index quantifies water stress through the normalization of leaf temperature between the maximum and minimum plant temperatures as a function of evaporation conditions. The responses of a low-cost infrared (IR) sensor were crossed with image processing through segmentation by the Excess Green model to develop a water stress detection system using CWSI. A soil/plant temperature map was generated through a point-to-point scan of the IR sensor. And when it overlaid with a segmented image of the experimental area, only points identified as plants had their temperature values maintained. The Non-Water-Stressed Baseline (NWSB) equation was parameterized for the same conditions of the experiment and external environmental. The experimental area was divided into three different treatments, maintained under stable water conditions throughout the experiment and the system was able to identify stably different stress values between treatments. Although the relationship between crop and environment affected the results, this work showed that using an irrigation system based on CWSI is possible.

show abstract

Mechanical properties of lettuce (Lactuca sativa L.) for horticultural machinery design

Cited by 4 publications

References 14 publications

Geothermal Energy: An Alternative to the Water–energy Dilemma in Northeastern Brazil

Geothermal Energy: An Alternative to the Water–energy Dilemma in Northeastern Brazil

Water Stress Index Detection Using a Low-Cost Infrared Sensor and Excess Green Image Processing

Water Stress Index Detection Using a Low-Cost Infrared Sensor and Excess Green Image Processing

Contact Info

Product

Resources

About