Examinando por Materia "Monitoring"

Mostrando 1 - 3 de 3

A method of monitoring of the bulb of quinoa plantations orientated to the dosing of the water volume for drip irrigation systems
(Institute of Electrical and Electronics Engineers, 2018-10-03) Phellan, Eduardo; Gutiérrez, Justiniano; Soto Jeri, Jonell; Capuñay, Simon; López, Jorge; Del Carpio, Christian
The present work proposes a method of electronic monitoring of physical variables of the plant's wet bulb, in order to properly dose the water volume required for drip irrigation systems. The method has the ability to be conditioned to the need of the plant, in order to maintain an optimum level of humidity in the crop field, as it would be achieved in a laboratory. The monitoring is carried out on the percentage of humidity and the electrical conductivity of the soil. For this, sensors are used that are properly calibrated in the operating ranges of 10 to 30% for humidity and 1.2 to 1.7 ds/m for electrical conductivity. The electronic equipment developed for the implementation of the method uses 3 humidity sensors placed at different depths and 1 electrical conductivity sensor for monitoring salinity. Based on the information sent by these sensors in real time, the activation times of the solenoid valve that makes up the drip irrigation system are adjusted.
An analysis of the rice-cultivation dynamics in the lower Utcubamba river basin using SAR and optical imagery in Google Earth Engine (GEE)
(MDPI, 2024-03-08) Medina Medina, Angel James; Salas López, Rolando; Zabaleta Santisteban, Jhon Antony; Tuesta Trauco, Katerin Meliza; Turpo Cayo, Efrain Yury; Huaman Haro, Nixon; Oliva Cruz, Manuel; Gómez Fernández, Darwin
One of the world’s major agricultural crops is rice (Oryza sativa), a staple food for more than half of the global population. In this research, synthetic aperture radar (SAR) and optical images are used to analyze the monthly dynamics of this crop in the lower Utcubamba river basin, Peru. In addition, this study addresses the need to obtain accurate and timely information on the areas under cultivation in order to calculate their agricultural production. To achieve this, SAR sensor and Sentinel-2 optical remote sensing images were integrated using computer technology, and the monthly dynamics of the rice crops were analyzed through mapping and geometric calculation of the surveyed areas. An algorithm was developed on the Google Earth Engine (GEE) virtual platform for the classification of the Sentinel-1 and Sentinel-2 images and a combination of both, the result of which was improved in ArcGIS Pro software version 3.0.1 using a spatial filter to reduce the “salt and pepper” effect. A total of 168 SAR images and 96 optical images were obtained, corrected, and classified using machine learning algorithms, achieving a monthly average accuracy of 96.4% and 0.951 with respect to the overall accuracy (OA) and Kappa Index (KI), respectively, in the year 2019. For the year 2020, the monthly averages were 94.4% for the OA and 0.922 for the KI. Thus, optical and SAR data offer excellent integration to address the information gaps between them, are of great importance to obtaining more robust products, and can be applied to improving agricultural production planning and management.
Variations on a theme: two structural motifs create species-specific pheromone channels for multiple species of South American cerambycid beetles
(MDPI, 2020-04-02) Silva, Weliton D.; Hanks, Lawrence M.; Silva Alvarez, Jean Carlos; Madalon, Fernando Z.; Bento, José Maurício S.; Bello, Jan E.; Millar, Jocelyn G.
We describe the identification, synthesis, and field-testing of aggregation-sex pheromones, or likely pheromone candidates, of seven species of South American cerambycid beetles in the subfamily Cerambycinae, of the tribes Eburiini and Neoibidionini. Analyses of extracts of volatiles released by adult males revealed that Eburodacrys dubitata White produce 11-methyltridecanal, whereas the males of Eburodacrys assimilis Gounelle, Eburodacrys flexuosa Gounelle, and Eburodacrys lenkoi Napp and Martins produce blends of this compound, along with its analog 10-methyldodecanal. In contrast, males of Compsibidion graphicum (Thomson) and Compsibidion sommeri (Thomson) produce blends of 10-methyldodecanal and its corresponding alcohol 10-methyldodecanol. The results from field bioassays with synthetic compounds showed that each species was specifically attracted to traps containing their reconstructed pheromone blend. However, E. assimilis was not trapped, possibly due to inhibition by non-natural enantiomers in the racemic test compounds. During the trials for the Compsibidion species, adults of another cerambycid species, Tetraopidion mucoriferum (Thomson), were captured in significant numbers in traps baited with 10-methyldodecanol, suggesting that this compound is a pheromone component for this species. This study demonstrates another case of conservation of pheromone structures within South American cerambycid species. It also highlights how blends of closely related structures, differing only in chain length or functional group, make the evolution of species-specific pheromone channels possible.