scholarly journals UAV Low-Altitude Remote Sensing for Precision Weed Management

2017 ◽  
Vol 32 (1) ◽  
pp. 2-6 ◽  
Author(s):  
Yanbo Huang ◽  
Krishna N. Reddy ◽  
Reginald S. Fletcher ◽  
Dean Pennington
Keyword(s):  
Remote Sensing ◽  
Precision Agriculture ◽  
Weed Management ◽  
Infrared Imaging ◽  
Weed Species ◽  
Crop Fields ◽  
Sensing Technology ◽  
Weed Infestation ◽  
High Resolution Images ◽  
Low Altitude

AbstractPrecision weed management, an application of precision agriculture, accounts for within-field variability of weed infestation and herbicide damage. Unmanned aerial vehicles (UAVs) provide a unique platform for remote sensing of field crops. They are more efficient and flexible than manned agricultural airplanes in acquiring high-resolution images at low altitudes and low speeds. UAVs are more universal than agricultural aircraft, because the latter are used only in specific regions. We have developed and used UAV systems for red–green–blue digital and color–infrared imaging over crop fields to identify weed species, determine crop injury from dicamba at different doses, and detect naturally grown glyphosate-resistant weeds. This article presents remote sensing technologies for weed management and focuses on development and application of UAV-based low-altitude remote sensing technology for precision weed management. In particular, this article futher discusses the potential application of UAV-based plant-sensing systems for mapping the distributions of glyphosate-resistant and glyphosate-susceptible weeds in crop fields.

scholarly journals Weeds and Their Effect on the Performance of Maize and Finger Millet in Mid-Hills of Nepal

2014 ◽  
Vol 2 (3) ◽  
pp. 275-278 ◽  
Author(s):  
Tika Bahadur Karki ◽  
Shrawan K. Sah ◽  
Resam B. Thapa ◽  
Andrew J. McDonald ◽  
Adam S. Davis ◽  
...  
Keyword(s):  
Weed Management ◽  
Crop Production ◽  
Finger Millet ◽  
Crop Yields ◽  
Management Strategies ◽  
Cropping System ◽  
Weed Species ◽  
Ageratum Conyzoides ◽  
Alternative Crop ◽  
Weed Infestation

Relay cropping of maize with fingermillet (maize/fingermillet) is the predominant cropping system for sustaining food security situation in the hilly regions of Nepal. In this region weed pressure severely reduces crop yields. Basic information on weed species composition, biomass production and their effect on crop yields and economics are lacking for this region. This information will be necessary to develop effective weed management strategies for the future. In light of this an empirical study was carried out in two representatives mid hill districts of Parbat and Baglung during summer season of 2010/2011 in Nepal. A total of 10 major weed species with densities of 172 in Parbat and 311 per 0.25m2 area in Baglung were observed. The highest percentage of both relative and absolute densities were recorded for Ageratum conyzoides in Parbat and Polygonum chinensis in Baglung. Weed infestation under farmers practice of crop management reduced the grain yield of maize by 1.985 Mt ha-1 (117%) in Baglung and 1.760 Mt ha-1 (108%) in Parbat. Similarly, in finger millet it was 0.489 Mt ha-1 (63%) in Baglung and 0.403 Mt ha-1 in Parbat. Similarly, the combined yield of both the crops was also significantly reduced by 79.3% and 61.7% in Baglung and Parbat respectively. Hence, weeds are directly affecting the crop performance in the region. Therefore, there is an urgent need to develop an alternative crop production system in the hills. DOI: http://dx.doi.org/10.3126/ijasbt.v2i3.10790Int J Appl Sci Biotechnol, Vol. 2(3): 275-278  

scholarly journals Medicinal weeds in the rice field of Kathmandu Valley, Nepal

2018 ◽  
Vol 6 ◽  
pp. 16-26
Author(s):  
Ram Sharan Dani ◽  
Achyut Tiwari
Keyword(s):  
Weed Management ◽  
Paddy Field ◽  
Rice Field ◽  
Anthropogenic Activities ◽  
Kathmandu Valley ◽  
Weed Species ◽  
Periodic Field ◽  
Crop Fields ◽  
History Of ◽  
Traditional Practitioners

Weed management in the crop field is one of the major challenges of agriculture. It has been reported that new weeds are encroaching crop fields due to anthropogenic activities such as the use of insecticides, pesticides and chemical fertilizer, and also due to climatic changes including warming temperatures, erratic and unseasonal precipitation, flood and landslides. The agricultural history of Kathmandu valley is quite old, which represents one of the highly productive valleys in of Nepal for agricultural crops including rice, indicating the long history of weeds in the region. There are quite a lot number of medicinally important plants found in rice field as weeds. Traditional practitioners are using these weeds in curing diseases as primary health care, and the utilization of weeds is the best method of weed management. The objective of this present study was to enumerate the weeds in and around paddy field and gather their medicinal properties of weeds among the local people of Kathmandu valley in order to assist with the weed management of paddy field. The periodic field survey was conducted in 9 selected sites, 3 from each district (Kathmandu, Lalitpur, and Bhaktapur) during summer 2012-2014 (two times: crop matured seasons and just after harvesting). We found 104 weed species belonging to 36 families in the rice field of Kathmandu valley that have medicine values.

The Application of Airborne Remote Sensing Technology in Land and Resources

2014 ◽  
Vol 644-650 ◽  
pp. 4360-4363
Author(s):  
Li Na Dong ◽  
Jing Tong ◽  
Chen Yang Wang
Keyword(s):  
Remote Sensing ◽  
High Resolution ◽  
Remote Sensing Data ◽  
Observation System ◽  
Airborne Remote Sensing ◽  
Geological Investigation ◽  
Good Efficiency ◽  
Sensing Technology ◽  
Earth Observation System ◽  
Low Altitude

Airborne and space remote sensing system are all the important parts of the earth observation system, also being good supplements to each other. Airborne remote sensing has the advantages of being high resolution, good efficiency and flexibility, which makes itself an effective method to rapidly acquire high resolution remote sensing data. Particularly, the technologies of conducting low altitude remote sensing investigation by unmanned aerial vehicles are rapidly developed with a great progress achieved, so there is no doubt that it will plays an important role in the remote sensing geological investigation.

scholarly journals Mechatronics System Design for Weed Management and Soil Condition Monitoring Within the Rows of Vineyards

2020 ◽  
Vol 9 (4) ◽  
pp. 3088-3094
Keyword(s):  
Condition Monitoring ◽  
Precision Agriculture ◽  
Weed Management ◽  
Complete Removal ◽  
Soil Condition ◽  
Weed Species ◽  
Berry Size ◽  
Living Organisms ◽  
The Right ◽  
Processing Techniques

Weed management always has been a vigorous task for farmers. Grapevines and weeds compete for water, nutrients, sunlight and have an unfavorable impact on berry size and sugar contents, if uncontrolled. More than 95% of herbicides are reported to reach a destination other than the targeted crops, resulting in wastage and many undesirable effects on the humans, other living organisms and the environment. Mechatronic system on agriculture vehicle is proposed for weed management and soil condition monitoring within the rows of the vineyards. Heavy and dense vegetation is first removed mechanically using a rotating knife and then herbicides are sprayed on the identified weeds, which enable it to reach up to the roots of the weeds for complete removal using image processing techniques. The designed Mechatronics system correctly identifies the different weed species and sprays the right quantity of herbicides at the right place and at the right time using the principle of Precision Agriculture. The proposed system also monitors the different parameters of the soil using a variety of sensors.

scholarly journals Effect of Fertilization and Weed Management on Weed Flora of Hemp Crop

2020 ◽  
Vol 77 (2) ◽  
pp. 44
Author(s):  
Angeliki KOUSTA ◽  
Panayiota PAPASTYLIANOU ◽  
Nikolina CΗΕΙΜΟΝΑ ◽  
Ilias TRAVLOS ◽  
Ioanna KAKABOUKI ◽  
...  
Keyword(s):  
Weed Management ◽  
Plant Traits ◽  
Growth Parameters ◽  
Initial Growth ◽  
Weed Species ◽  
Potential Yield ◽  
Affected Plant ◽  
Weed Flora ◽  
Weed Infestation ◽  
Density And Biomass

Hemp is known to have a competitive advantage over weeds. Despite its suppressive ability, weed infestation remains an important issue during the early growth of the crop. The aim of this study was to determine the effect of fertilization and weed management on weed flora and hemp growth parameters during initial growth in the 2019 season. The experiment was laid out in a split-split plot design with three replicates: three hemp cultivars as main plots, three fertilization treatments as sub-plots and two sub-sub-plots (weedy, weed free). For the computation of height and biomass weight, 10 plants were randomly selected in each plot. Weed species were collected by quadrate and density and biomass weight were determined. ANOVA revealed that all factors and their interactions significantly affected plant traits. Hemp cultivars showed different competitive ability. ‘Futura 17’ reduced weed measurement traits better than ‘Uso 31’. Density and biomass of nitrophilous weeds increased with the higher N dose compared to control (up to 56% and 79% respectively), therefore negatively affecting the growth of the hemp plants. Further research is needed in order to identify useful information on interactions between weeds and hemp crop to address potential yield losses under different weed management systems.

scholarly journals Low Altitude Unmanned Aerial Vehicles (UAVs) and Satellite Remote Sensing Are Used to Calculated River Discharge Attenuation Coefficients of Ungauged Catchments in Arid Desert

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2633 ◽  
Author(s):  
Shengtian Yang ◽  
Juan Wang ◽  
Pengfei Wang ◽  
Tongliang Gong ◽  
Huiping Liu
Keyword(s):  
Remote Sensing ◽  
Surface Runoff ◽  
Satellite Remote Sensing ◽  
River Discharge ◽  
Ungauged Catchments ◽  
Attenuation Coefficients ◽  
Remote Sensing Technology ◽  
Sensing Technology ◽  
Low Altitude ◽  
Arid Desert

The arid desert ecosystem is very fragile, and the change of its river discharge has a direct impact on irrigation and natural environment. River discharge attenuation coefficients is a key index to reveal the stability of desert river ecosystem. However, due to the harsh conditions in desert areas, it is difficult to establish a hydrological station to obtain data and calculate the attenuation coefficients, so it is urgent to develop new methods to master the attenuation coefficients of rivers. In this study, Taklamakan desert river was selected as the research area, and the river discharge of the desert river were estimated by combining low-altitude UAV and satellite remote sensing technology, so as to calculate the attenuation status of the river in its natural state. Combined with satellite remote sensing, the surface runoff in the desert reaches of the Hotan River from 1993 to 2017 were estimated. The results showed that the base of runoff attenuation in the lower reaches of the Hotan River is 40%. Coupled UAV and satellite remote sensing technology can provide technical support for the study of surface runoff in desert rivers within ungauged basins. Using UAV and satellite remote sensing can monitor surface runoff effectively providing important reference for river discharge monitoring in ungauged catchments.

Application of low altitude remote sensing (LARS) platform for monitoring crop growth and weed infestation in a soybean plantation

2012 ◽  
Vol 13 (6) ◽  
pp. 611-627 ◽  
Author(s):  
Grianggai Samseemoung ◽  
Peeyush Soni ◽  
Hemantha P. W. Jayasuriya ◽  
Vilas M. Salokhe
Keyword(s):  
Remote Sensing ◽  
Crop Growth ◽  
Weed Infestation ◽  
Low Altitude
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