186,315 research outputs found
Finger weeder for cabbage and lettuce cultures
No full textSummer 2002 we compared finger weeder against net harrow and herbicides in cabbage. Field trial 2003 was dedicated to lettuce: we compared different intensities of finger weeding in two different lettuce cultivars
Influence of the weeder on weed infestation of wicker plantation
No full textDoświadczenie polowe przeprowadzono w latach 2005-2007 w uprawie wikliny na Uniwersytecie Przyrodniczym w Poznaniu. Badano w nich skuteczność zwalczania chwastów po zastosowaniu mechanicznej pielęgnacji międzyrzędzi. Skuteczność zwalczania chwastów wynosiła od 34,6% do 82,2%. Plon prętów wikliny po zastosowaniu pielęgnacji mechanicznej wzrastał od 100% do 142,1%.Field experiments were conducted at the Poznań University of Life Sciences in 2005-2007. The weed control after weeder in wicker was the object of this investigation. The weed control efficacy after weeder was observed at 34,6% to 82,2%. The wicker yield after applying of the mechanical weed control grew from 100 to 142.1%
Design and Development of Ridge Profile Power Weeder
No full textImproper weed control methods can cause about 30–35% reduction in crop yield. Mechanical weed control on ridges is still a major problem. A ridge profile power weeder was designed and developed for weeding of ridge planted crops. The main working components of the weeder were cutting blades and rotor shaft. Three types of blades (L-type, C-type and Flat-type) were selected having length, width and thickness of 100 mm, 25 mm and 6 mm, respectively, operating with a rotor shaft of 18 mm in diameter. C-type blades were most suitable at gang speed of 200 rpm and 15.26±0.96% (d.b) soil moisture content with weeding efficiency, plant damage, field capacity of 91.37%, 2.66%, and 0.086 ha.h-1, respectively. Time saving with ridge profile power weeder as compared to manual weeding was 92.97 per cent
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Design and development of four wheel weeder for wide-row crops
No full textSingle/twin wheel weeders have been developed for manual weeding in about 20 cm row spaced crops. These weeders are unable to provide uniform depth of cut and lateral stability. Presently marginal and small farmers in the country are inclined to grow cash crops. Manual weeders are not available for vegetables planted at row spacing of 30 to 50 cm. Keeping these facts in view, a weeder, employing two innovative techniques such as application of ‘Four- wheels’ and ‘Swinging handle’ was developed for wide row spaced crops. The slicing/cutting the weeds with best possible depth control were the main considerations for its design. Anthropometric data of men and women workers were taken into considerations for design of components of the weeder. Weight of equipment was kept below 10 kg as per the ergonomic requirement by adopting alternate fabrication material. Soil bin study on push force revealed the significant effect of compaction levels and handle angles on the performance of operator in terms of high force. The minimum field capacity of the weeder was 0.0206 ha/h with more than 95% weeding efficiency. The push force requirement per cm cutting width was lowest (6.34N) as compared to other mechanical weeders. The ergo-mech approach of design enabled operators to complete the weeding work timely with reduced drudgery and increased productivity as compared to conventional practice
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
DESIGN ANALYSIS AND INVESTIGATION OF FABRICATED WEEDER FOR TAPIOCA FARM
No full textIn the present-day agriculture, weed regulator in the farm lands is a tedious process that needs more money and human effort. There are a number of methods such as manually removing the unwanted plants by using traditional hand tools or by spraying chemical weedicides which will kill the weeds or using some mechanical equipment’s. Of the above-mentioned methods, the mechanical weeding is mostly preferred due to its low operating cost and human effort. Moreover, the efficiency of the mechanical weeding process is high when compared with the other methods. In dry land tapioca farms, it is difficult to remove the unwanted weed plants by using the existing weeding equipment’s. In the tapioca farms, the tubers of tapioca are located only few millimeters below the soil surface. The present -day weeding equipment’s remove the weed plants by digging the soil surface and it is not favoured because the process will cause damage to the tubers. The use of chemical weedicides is not preferred due to the hazardous nature of the chemicals. The manual weeding process is also not preferred because of the high labour cost. So, in this project A mechanical equipment for carrying out the weeding process in the tapioca farms is designed and fabricated in a way such that it will not cause any damage to the crops. The weeder will only remove the unwanted weed crops in the farm. Apart from the weeding operation, the weeder can make the soil surface loose which will increase the porosity of the soil. Hence the water percolation will be more and the moisture content of the soil can also be maintained. Thus, the weeder will reduce the costs involved in the maintenance of the tapioca farm lands. It will also reduce the human effort involved in the weeding proces
Weeder Web: discovery of transcription factor binding sites in a set of sequences from co-regulated genes
No full textOne of the greatest challenges that modern molecular biology is facing is the understanding of the complex mechanisms regulating gene expression. A fundamental step in this process requires the characterization of regulatory motifs playing key roles in the regulation of gene expression at transcriptional and post-transcriptional levels. In particular, transcription is modulated by the interaction of transcription factors with their corresponding binding sites. Weeder Web is a web interface to Weeder, an algorithm for the automatic discovery of conserved motifs in a set of related regulatory DNA sequences. The motifs found are in turn likely to be instances of binding sites for some transcription factor. Other than providing access to the program, the interface has been designed so to make usage of the program itself as simple as possible, and to require very little prior knowledge about the length and the conservation of the motifs to be found. In fact, the interface automatically starts different runs of the program, each one with different parameters, and provides the user with an overall summary of the results as well as some ‘advice ’ on which motifs look more interesting according to their statistical significance and some simple considerations. The web interface is available at the address www.pesolelab.it by following the ‘Tools ’ link
VIBRATIONS LEVELS ASSESSMENT OF A ROBOTIC INTRA-ROW WEEDER USING LOW-COST DATA ACQUISITION SYSTEM
No full textAutomated weeding is a way to increase efficiency in the control of invasive plants. Soil characteristics can influence the performance of weeder mechanisms. The objective of this work was to determine the vibrations levels of a robotic intra-row weeder mechanism for different operating conditions and provide information to correlate with soil conditions. The data acquisition system was composed of a single-board computer and a triaxial MEMS accelerometer. The computer was programmed in C++ to acquire vibration measurements. The accelerometer was mounted to the bearing housing of the rotary tine shaft. Vibrations of the weeder mechanism were first measured without soil contact for different angular velocities of the rotary tine disk. Then, vibrations were monitored in different soils (dry and moist loam soil and sand) for three angular velocities of rotary tines (25, 50 and 100 rev/min) and two tine depths (25 and 50 mm). RMS accelerations and the frequency spectrum were used to evaluate the vibrations levels. Moist loam soil and sand had the highest and lowest increases in accelerations, respectively. The analysis showed it is possible to correlate vibrational characteristics with soil conditions that may exist during intra-row weeding. In addition, mechanical vibrations in an intra-row weeder can be monitored using a low-cost and user-friendly system.This proceeding is published as Villibor, Geice Paula, Brian L. Steward, Greg R. Luecke, Daniel M. Queiroz, Lie Tang, and Safal Kshetri. "Vibrations Levels Assessment of a Robotic Intra-Row Weeder Using Low-Cost Data Acquisition System." In 2017 ASABE Annual International Meeting. 2017. Paper No. 1700652. (DOI: 10.13031/aim.201700652). </p
Design, Development and Evaluation of a Power-Operated Cono Weeder for Wetland Rice Farming
No full textManual cono weeding in rice cultivation demands significant labor and energy. To address the same, a power-operated cono weeder was developed at the Agricultural Engineering and Research Institute, Tamil Nadu Agricultural University, Kumulur, Trichy, between 2018 and 2020. The new design incorporated a main frame, a 1 kW petrol engine, a power transmission system, a handle, plastic molded ground wheels, a slider crank mechanism for weeding cone motion, an adjustable depth control lever, and plastic molded weeding cones with MS blades. It offers adjustable depth settings from 15 mm to 70 mm. Field performance was assessed across three operational speeds (0.28 m s-1, 0.42 m s-1 and 0.56 m s-1) and water levels (10 mm, 25 mm, and 40 mm). Results showed maximum weeding efficiency (85%) and field capacity (0.026 ha h-1) at an operational speed of 0.42 m s-1 and a water level of 25 mm. Minimal plant damage (1.2%) occurred at an operational speed of 0.28 m s-1 and a water level of 10 mm. The weeder demonstrated an operational efficiency of 86.5% in the field. This power-operated cono weeder offers a promising solution to the labor-intensive manual cono weeding in rice cultivation. Its adjustable depth control and efficient field performance indicate potential for enhancing productivity while reducing labor costs and environmental impact
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