نتایج جستجو برای: rice fields

تعداد نتایج: 314519  

1997

An investigation of the migration of 3-chloro-p-toluidine hydrochloride (CPTH) on treated rice baits to soils in Louisiana rice fields was completed. The persistence of free CPTH in these soils was evaluated with field and laboratory experiments. These soils were also screened for the presence of CPTH degradation products. Soils treated with CPTHfortified rice bait and aqueous solutions of CPTH...

2015
Qingsong Liu Jörg Romeis Huilin Yu Yongjun Zhang Yunhe Li Yufa Peng

We determined whether plant volatiles help explain why Cotesia chilonis (a parasitoid of the target pest Chilo suppressalis) is less abundant in Bt than in non-Bt rice fields. Olfactometer studies revealed that C. chilonis females responded similarly to undamaged Bt and non-Bt rice plants. Parasitoids preferred rice plants damaged by 3(rd)-instar larvae of C. suppressalis, but did not different...

Journal: :Medical and veterinary entomology 2000
T J Victor R Reuben

The effects of nitrogenous (inorganic) fertilisers, organic manures and blue-green algae (BGA) biofertiliser on mosquito populations (Diptera: Culicidae) were studied in rice fields of Madurai, Tamil Nadu, south India, with particular attention to Culex vishnui Theobald, Cx. pseudovishnui Colless and Cx. tritaeniorhynchus Giles, the vectors of Japanese encephalitis (JE). The application of urea...

Journal: :Frontiers of earth science 2016
Cui Jin Xiangming Xiao Jinwei Dong Yuanwei Qin Zongming Wang

Information of paddy rice distribution is essential for food production and methane emission calculation. Phenology-based algorithms have been utilized in the mapping of paddy rice fields by identifying the unique flooding and seedling transplanting phases using multi-temporal moderate resolution (500 m to 1 km) images. In this study, we developed simple algorithms to identify paddy rice at a f...

Journal: :ISPRS journal of photogrammetry and remote sensing : official publication of the International Society for Photogrammetry and Remote Sensing 2015
Geli Zhang Xiangming Xiao Jinwei Dong Weili Kou Cui Jin Yuanwei Qin Yuting Zhou Jie Wang Michael Angelo Menarguez Chandrashekhar Biradar

Knowledge of the area and spatial distribution of paddy rice is important for assessment of food security, management of water resources, and estimation of greenhouse gas (methane) emissions. Paddy rice agriculture has expanded rapidly in northeastern China in the last decade, but there are no updated maps of paddy rice fields in the region. Existing algorithms for identifying paddy rice fields...

2013
Kohei Arai

Rice crop quality evaluation method through regressive analysis between nitrogen content in the rice leaves and near infrared reflectance measurement data from near field, from radio wave controlled helicopter is proposed. Rice quality dependency on nitrogen of chemical fertilizer and water supply condition is evaluated. Also homogeneity of the rice crop quality in the paddy fields is evaluated...

Journal: :Molecular ecology 2010
Briana L Gross Michael Reagon Shih-Chung Hsu Ana L Caicedo Yulin Jia Kenneth M Olsen

Weedy forms of crop species infest agricultural fields worldwide and are a leading cause of crop losses, yet little is known about how these weeds evolve. Red rice (Oryza sativa), a major weed of cultivated rice fields in the US, is recognized by the dark-pigmented grain that gives it its common name. Studies using neutral molecular markers have indicated a close relationship between US red ric...

2011
Juan M. Lopez-Sanchez Shane R. Cloude J. David Ballester-Berman

The polarimetric behaviour of rice fields at different phenological stages has been analysed by using time series of TerraSAR-X images. These are X-band copolar dual-pol images available for the whole growth cycle. As plants grow, changes in their morphology produce clear signatures in various polarimetric observables. Based on this sensitivity to phenology, a physically based retrieval approac...

1980
D. B. COPEMAN

SUHARDONO and D.B. COPEMAN 2000. Population dinamics of Lymnaea rubiginosa in rice fields and its infection with larvae of trematodes. Jurnal Ilmu Ternak dan Veteriner 5(4): 241-249. Field of irrigated rice paddy was the most suitable habitat as breeding site of snail Lymnaea rubiginosa, the intermadiate host of Fasciola gigantica and other trematodes. Fluctuations in the population of fresh wa...

Journal: :Int. J. Applied Earth Observation and Geoinformation 2011
Dailiang Peng Alfredo R. Huete Jingfeng Huang Fuming Wang Huasheng Sun

In this paper, we developed a more sophisticated method for detection and estimation of mixed paddy rice agriculture from Moderate Resolution Imaging Spectroradiometer (MODIS) satellite data. Previous research demonstrated thatMODIS data can be used tomap paddy rice fields and to distinguish rice from other crops at large, continental scaleswith combined Enhanced Vegetation Index (EVI) and Land...

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