Results 221 to 230 of about 14,595 (259)
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Relative density of weeds and weed indices as influenced by weed control options in cotton
Indian Journal of Weed Science, 2019Field experiments were conducted at Professor Jayashankar Telangana State Agricultural University, Rajendranagar during Kharif 2017 for the evaluation of efficacy different doses of diuron in both red and black soils. The treatment consisted of test herbicides such as, diuron 80% WP at 0.5 kg/ha, 0.75 kg/ha and 1.0 kg/ha along with registered ...
N. Varsha +3 more
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Weed Density Estimation Using Semantic Segmentation
2020Use of herbicides is rising globally to enhance crop yield and meet the ever increasing food demand. It adversely impacts environment and biosphere. To rationalize its use, variable rate herbicide based on weed densities mapping is a promising technique.
Muhammad Hamza Asad, Abdul Bais
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Modelling the effects of herbicide dose and weed density on rice‐weed competition
Weed Research, 2014SummaryThe effects of herbicide dose on rice‐weed competition were investigated to develop a combined model, which can be utilised to estimate an optimum herbicide dose for a given weed density in paddy rice cultivation. Field studies were conducted in Suwon for rice‐Echinochloa crus‐galli competition and Iksan for rice‐Eleocharis kuroguwai during 2007.
B C Moon +5 more
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Weed Research, 1996
SummaryWeed removal experiments were conducted in growers' fields in northern Colorado to assess the effect of duration of competition, weed density, weed competitiveness and crop density on irrigated seeded onion (Allium cepa L.). Duration of competition, expressed in thermal time units (TTUs) with a base of 7.2^C, explained 65% of the variation in ...
C. M. DUNAN +3 more
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SummaryWeed removal experiments were conducted in growers' fields in northern Colorado to assess the effect of duration of competition, weed density, weed competitiveness and crop density on irrigated seeded onion (Allium cepa L.). Duration of competition, expressed in thermal time units (TTUs) with a base of 7.2^C, explained 65% of the variation in ...
C. M. DUNAN +3 more
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Level of threshold weed density does not affect the long-term frequency of weed control
Crop Protection, 1997Abstract Weed control thresholds are often presented as a means to reduce unnecessary control measures, thereby increasing the effectiveness of weed management. While the threshold is a useful tool for cost-effective application of control on a single-year base, its role over the longer term is more complicated. It is shown that long-term application
Wallinga, J., van Oijen, M.
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Crop loss elasticity in relation to weed density and control
Agricultural Systems, 1984Abstract Relationships between yield loss in crops and weed density are analysed using an elasticity function ( ( d L L ) ( d W W ) ). In general, loss in crops production caused per weed is higher in low density weed populations than in higher density weed populations.
Tisdell, CA, Auld, BA, Menz, KM
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2019 Boston, Massachusetts July 7- July 10, 2019, 2019
Abstract. This paper presents a novel technique to crop signaling to classify weed and crop for robotic weed control for leafy vegetables. It is a big challenge to classify weeds from the crop plants in a field with high weed densities in the process of automatic weed control due to the high levels of visual occlusion that impair visibility.
R Raja +2 more
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Abstract. This paper presents a novel technique to crop signaling to classify weed and crop for robotic weed control for leafy vegetables. It is a big challenge to classify weeds from the crop plants in a field with high weed densities in the process of automatic weed control due to the high levels of visual occlusion that impair visibility.
R Raja +2 more
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Weed Density Around MacMillian Building
2010Disclaimer: “UBC SEEDS provides students with the opportunity to share the findings of their studies, as well as their opinions, conclusions and recommendations with the UBC community. The reader should bear in mind that this is a student project/report and is not an official document of UBC.
Nugent, Michael R +2 more
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Selecting a Sampling Method for Weed Densities: The Case of Weed Removal in Strips
Weed Science, 1995When a range of weed densities is needed for competition experiments, one method of reducing existing populations is to remove all weeds in strips of specified length down the crop row. This technique also can be used to create different sizes of weed dusters.
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Precision weed control robot for vegetable fields with high crop and weed densities
2019 Boston, Massachusetts July 7- July 10, 2019, 2019Abstract. Weeds growing in close proximity to the seedline area are highly competitive for resources needed by crop plants and causes a reduction in crop productivity if left uncontrolled. A method to automate the weed removal process, which is currently a costly manual operation, is in high demand by vegetable growers.
Rekha Rajaa +3 more
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