Vasu Udompetaikul

• Doctor of Philosophy
• Assistant Professor at King Mongkut's Institute of Technology Ladkrabang

Accurate and rapid discrimination between nodes and internodes in sugarcane is vital for automating planting processes, particularly for minimizing bud damage and optimizing planting material quality. This study investigates the potential of visible-shortwave near-infrared (Vis–SWNIR) spectroscopy (400–1000 nm) combined with machine learning for th...

This study evaluated the application of proximal multispectral images accompanied by 4 machine learning approaches for estimating the nutritional status of oil palm leaves. The image responded for five bands: blue, green, red, red edge, and near-infrared regions with a center wavelength of 475, 560, 668, 717, and 840 nm. Average and standard deviat...

This study proposed individual spectral wavelengths significant to estimate soluble solids content (SSC) in sugarcane billets moving on the conveyor. At the same time, an all-in-one quality and yield monitor using those wavelengths for a sugarcane harvester was also proposed. Seven wavelengths, 475, 560, 668, 717, 755, 840, and 890 nm, were arrange...

Harvesting is an important activity in the sugar production industry. Due to the labor shortage and time limitation during harvesting season, farmers have adopted cane harvesters to substitute the farm workers in this restless period. Cane harvesters are huge and expensive machines with high field capacity. Because of inappropriate working conditio...

Recently, sugarcane harvesters have been increasingly used in sugarcane harvesting. Loading trucks were traveling along the harvesters to collect the harvested cane billets. Since cane harvesters are expensive machines, there is an idea of collaborative farming by combining multiple fields from different owners to reduce operating costs and time. H...

Moisture content is an important parameter measured in tapioca starch production as this parameter has been shown to correlate strongly with the quality of the finished product. However, there is currently no in-line sensor which can be used to directly measure the moisture content of the product in real time. The objective of the present work was...

The aim of this research study is to propose a prototype online detection system based on the visible and near-infrared spectroscopic (vis/SW-NIR) technique for the real-time evaluation of the soluble solids content (SSC) of sugarcane billets on an elevator conveyor. The system consisted of two main parts, a cane billet elevator and a spectral acqu...

Field efficiency of machines tells how efficient the farm machines are operating in the field. Measuring of the field efficiency used to be a tedious and laborious work which is not worth to collect for further operational optimization. The objective of this study was to develop an automatic system for monitoring the field activities and then evalu...

A second generation mobile platform has been developed and used for measuring midday canopy photosynthetically active radiation interception in orchard systems. The system is equipped with a global positioning satellite (GPS) system and uses 800 photodiodes to measure light in the wavelength of photosynthetically active radiation and is adjustable...

A mobile sensor suite was developed and evaluated to predict plant water status by measuring the leaf temperature and microclimatic variables in nut crop trees and grapevines. The sensor suite consists of an infrared thermometer to measure leaf temperature along with other relevant sensors to measure microclimatic variables. The sensor suite was su...

Our research goal was to use recent advances in global positioning system (GPS) and computer technology to apply just the right amount of fumigant where it is most needed (i.e., in a small target treatment zone in and around each tree replanting site) to control Prunus replant disease (PRD). We developed and confirmed the function of (1) GPS-based...

As much as one-third of California's almond and stone fruit acreage is infested with potentially debilitating plant parasitic nematodes, and even more of the land is impacted by Prunus replant disease (PRD), a poorly understood soilborne disease complex that suppresses early growth and cumulative yield in replanted almond and peach orchards. Prepla...

A mobile platform was developed for measuring midday canopy photosynthetically active radiation (PAR) interception in orchards. The results presented are for almond (Prunus dulcis) and walnut (Juglans regia), but the mobile platform can be used in other orchard crops as well. The mobile platform is adjustable to accommodate orchard row spacing from...

A mobile sensor suite was developed and evaluated to predict plant water status by measuring the leaf temperature of nut trees and grapevines. It consists of an infrared thermometer to measure leaf temperature along with relevant ambient condition sensors to measure microclimatic variables in the vicinity of the leaf. Sensor suite was successfully...

Low/correct tire inflation pressure has been recommended for use in agricultural fields to improve tractive performance and fuel economy of a tractor. However, on paved road, higher inflation pressure appears to result in better performance. To determine the effect of inflation pressure on fuel consumption during transport operations, extensive tes...

A proximal sensor suite consisting of an infrared thermometer, an air temperature sensor, a humidity sensor, a PAR sensor, and an anemometer was developed to measured leaf temperature and other relevant microclimatic information to determine plant water status. A series of experiments were conducted in almond and walnut orchards to study relationsh...

The goal of this research was to develop a mobile sensor suite to determine plant water status in almonds and walnuts. The sensor suite consisted of an infrared thermometer to measure leaf temperature and additional sensors to measure relevant ambient conditions such as light intensity, air temperature, air humidity, and wind speed. In the Summer o...

The goal of this research was to use recent advances in the global positioning system (GPS) and computer technology to apply just the right amount of fumigant where it is most needed (i.e., tree-planting-site-specific application) to decrease the incidence of replant disease, and achieve the environmental and economical benefits of reducing the app...

The objective of this study was to develop a mechanical model for cohesive, plastic behavior of soil by the Distinct Element Method (DEM). The DEM has been applied to solve problems of soil-tool interaction. There is still a need for improving the representation of complicated soil behavior and reaction forces on the machine parts. This study focus...

The goal of this research was to use recent advances in the global positioning system and computer technology to apply just the right amount of fumigant where it is most needed (i.e., in the neighborhood of each tree planting site or tree-planting-site-specific application) to decrease the incidence of replant disease, and achieve the environmental...

The goal of this research was to use recent advances in the global positioning system and computer technology to apply just the right amount of fumigant (0.2 kg/tree) where it is most needed (i.e., in the neighborhood of each tree planting site) to decrease the incidence of replant disease. Upadhyaya et al. (2008) and Udompetaikul et al. (2008) hav...