11 results match your criteria crop fvc

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Method for accurate multi-growth-stage estimation of fractional vegetation cover using unmanned aerial vehicle remote sensing.

Plant Methods 2021 May 17;17(1):51. Epub 2021 May 17.

College of Information and Management Science, Henan Agricultural University, Zhengzhou, 450002, China.

Background: Fractional vegetation cover (FVC) is an important parameter for evaluating crop-growth status. Optical remote-sensing techniques combined with the pixel dichotomy model (PDM) are widely used to estimate cropland FVC with medium to high spatial resolution on the ground. However, PDM-based FVC estimation is limited by effects stemming from the variation of crop canopy chlorophyll content (CCC). Read More

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A model for phenotyping crop fractional vegetation cover using imagery from unmanned aerial vehicles.

J Exp Bot 2021 Jun;72(13):4691-4707

College of Biosystems Engineering and Food Science, and State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, China.

Fractional vegetation cover (FVC) is the key trait of interest for characterizing crop growth status in crop breeding and precision management. Accurate quantification of FVC among different breeding lines, cultivars, and growth environments is challenging, especially because of the large spatiotemporal variability in complex field conditions. This study presents an ensemble modeling strategy for phenotyping crop FVC from unmanned aerial vehicle (UAV)-based multispectral images by coupling the PROSAIL model with a gap probability model (PROSAIL-GP). Read More

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A Refined Crop Drought Monitoring Method Based on the Chinese GF-1 Wide Field View Data.

Sensors (Basel) 2018 Apr 23;18(4). Epub 2018 Apr 23.

National Disaster Reduction Center of China, Beijing 100124, China.

In this study, modified perpendicular drought index (MPDI) models based on the red-near infrared spectral space are established for the first time through the analysis of the spectral characteristics of GF-1 wide field view (WFV) data, with a high spatial resolution of 16 m and the highest frequency as high as once every 4 days. GF-1 data was from the Chinese-made, new-generation high-resolution GF-1 remote sensing satellites. Soil-type spatial data are introduced for simulating soil lines in different soil types for reducing errors of using same soil line. Read More

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Domestic solid fuel combustion in an adult population in Nigeria: A cross sectional analysis of association with respiratory symptoms, quality of life and lung function.

Respir Med 2017 Sep 19;130:61-68. Epub 2017 Jul 19.

Department of Medicine, Obafemi Awolowo University, Ile-Ife, Nigeria.

Background And Objectives: We examined the association of respiratory symptoms, health status, and lung function with the use of solid fuel (wood, charcoal, coal or crop residue) for cooking or heating in a predominantly non-smoking population.

Methods: Using the protocol of the Burden of Obstructive Lung Diseases (BOLD) initiative, we collected representative population data using questionnaires and spirometry tests. We categorized solid fuel use into 'never user', 'ex user' and 'current user' based on responses to the survey. Read More

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September 2017

The analyses of risk factors for COPD in the Li ethnic group in Hainan, People's Republic of China.

Int J Chron Obstruct Pulmon Dis 2015 30;10:2593-600. Epub 2015 Nov 30.

Department of Emergency, People's Hospital of Hainan Province, Haikou, Hainan, People's Republic of China.

Objective: To study the risk factors for chronic obstructive pulmonary disease (COPD) in Li population in Hainan province, People's Republic of China.

Methods: Li people above 40 years of age from Hainan were chosen by stratified random cluster sampling between 2012 and 2014. All participants were interviewed with a home-visiting questionnaire, and spirometry was performed on all eligible participants. Read More

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September 2016

Prevalence and risk factors for COPD in farmers: a cross-sectional controlled study.

Eur Respir J 2016 Jan 9;47(1):95-103. Epub 2015 Oct 9.

Service d'Explorations Fonctionnelles Respiratoires, Centre Hospitalier Régional Universitaire (CHRU), Besançon, France EA 3920, Université de Franche-Comté, Besançon, France

There are conflicting data regarding the magnitude and determinants of chronic obstructive pulmonary disease (COPD) risk in farmers.In a cross-sectional study of 917 nonfarming working controls and 3787 farmers aged 40-75 years, we assessed respiratory symptoms, tobacco exposure, job history (without direct exposure measurement) and lung function. COPD was defined by the Global Initiative for Chronic Obstructive Lung Disease (GOLD) criterion (post-bronchodilator forced expiratory volume in 1 s (FEV1)/forced vital capacity (FVC) <0. Read More

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January 2016

Agricultural work exposures and pulmonary function among hired farm workers in California (the MICASA study).

J Agromedicine 2014 ;19(4):427-36

a Center for Tobacco Control Research and Education , University of California, San Francisco , San Francisco , California , USA.

Despite California's dependence on hired farm labor, scarce research has been conducted on the respiratory health of hired farm workers. Agricultural exposures to inorganic and organic dusts can adversely affect an individual's respiratory health and differ by farm type and job task. The purpose of the present analysis was to examine associations between agricultural work exposures and pulmonary function among 450 California farm workers. Read More

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October 2015

Effects of exposure to rice-crop residue burning smoke on pulmonary functions and oxygen saturation level of human beings in Patiala (India).

Sci Total Environ 2012 Jul 10;429:161-6. Epub 2012 May 10.

Thapar University Patiala, New Delhi, India.

Pulmonary Function Tests (PFTs) like Force Vital Capacity (FVC), Force Expiratory Volume in one second (FEV₁), Peak Expiratory Flow (PEF) and Force Expiratory Flow between 25 and 75% of FVC (FEF(25-75%)) and Oxygen Saturation (SpO₂) level of 50 healthy inhabitants with respect to rice crop residue burning were investigated for three rice cultivation periods from 2007 to 2009. The subjects were residents of five sampling sites selected in Patiala city. Concentration of Suspended Particulate Matter (SPM), Sulfur dioxide (SO₂), Nitrogen dioxide (NO₂) and Particulate Matter (PM) of size less than 10 and 2. Read More

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Effects of agriculture crop residue burning on children and young on PFTs in North West India.

Sci Total Environ 2010 Sep 16;408(20):4440-5. Epub 2010 Jul 16.

Thapar University, Patiala-147004, India.

Variations in pulmonary function tests (PFTs) due to agriculture crop residue burning (ACRB) on children between the age group of 10 to 13 years and the young between 20 to 35 years are studied. The effects of exposure to smoke due to rice-wheat crop residue burning on pulmonary functions like Force Vital Capacity (FVC), Force Expiratory Volume in one second (FEV(1)), Peak Expiratory Flow (PEF) and Force Expiratory Flow in 25 to 75% of FVC (FEF(25-75%)) on 40 healthy subjects of rural/agricultural area of Sidhuwal village of Patiala City were investigated for a period from August 2008 to July 2009. Measurements were taken by spirometry according to the American Thoracic Society standards. Read More

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September 2010

Chronic bronchitis, COPD, and lung function in farmers: the role of biological agents.

Chest 2009 Sep 24;136(3):716-725. Epub 2009 Mar 24.

Centre for Public Health Research, Massey University, Wellington, New Zealands.

Background: Farmers have an increased risk of respiratory morbidity and mortality. The causal agents have not been fully established.

Methods: In a cross-sectional study of 4,735 Norwegian farmers, we assessed respiratory symptoms and lung function. Read More

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September 2009

Reduced FVC among California grape workers.

Am Rev Respir Dis 1992 Feb;145(2 Pt 1):257-62

Department of Internal Medicine, University of California, Davis 95616-8648.

Pulmonary disease due to organic and inorganic dust inhalation represents a significant health problem in the agricultural community. In response to concern over the potential adverse health effects of agricultural exposures, and to address the question of whether the specific crop worked was associated with decreased lung function, we conducted a cross-sectional survey of pulmonary function in a population of 238 grape workers, 355 tomato workers, and 166 citrus workers in California's Central Valley. In addition, 92 workers (66 males and 26 females) performed spirometry before and after an 8-h work shift. Read More

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February 1992
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