نتایج جستجو برای: weed

تعداد نتایج: 11355  

2014
Graham Brookes

Crops that have been genetically modified (GM) to be tolerant to herbicides have been widely grown in the USA since 1996. The rapid and widespread adoption of this technology reflects the important economic and environmental benefits that farmers have derived from its use (equal to $21.7 billion additional farm income and a 225 million kg reduction in herbicide active ingredient use 1996-2012)....

2014
K. Mubeen M. A. Nadeem A. Tanveer A. J. Jhala

Field experiments were conducted during the 2 year period from 2008 and 2009 to determine the effects of three seeding dates and seven weed control methods in DSR. The results suggested that seeding in the first week of July reduced weed density and biomass, increased kernel weight, leaf area index, and kernel yield compared to seeding rice in the first week of July. Amongst weed control method...

2007
L. González-Díaz E. Leguizamón F. Forcella J. L. González-Andújar

Weed emergence models and weed population models have shown to be important tools for decision making. However, there have been no attempts to integrate a weed emergence model with a population dynamics model to build an improved model with increased predictive capacity. In this paper, a method of integrating both types of model is presented and an application building a mathematical model base...

2015
Sean C. McKenzie Hayes B. Goosey Kevin M. O’Neill Fabian D. Menalled

Cover crops are a suite of non-marketable plant species grown to improve soil quality. They may have additional benefits including reduced weed pressure and enhanced habitat for beneficial arthropods, but they do not provide direct revenue. Integrating sheep grazing for cover crop termination could make the use of cover crops more economically feasible. However, if grazing shifts biological com...

حمزه ئی, جواد, سیدی, محسن,

To evaluate the advantage of chickpea-barley intercropping systems under weed interference conditions, an experiment was conducted at the Agricultural Research Station, Faculty of Agriculture, University of Bu-Ali Sina, during 2010 growing season. Experiment was conducted as split plot base on randomized complete block design with three replications. Weed control treatment at two levels of weed...

2014
P. Javier Herrera José Dorado Angela Ribeiro

An important objective in weed management is the discrimination between grasses (monocots) and broad-leaved weeds (dicots), because these two weed groups can be appropriately controlled by specific herbicides. In fact, efficiency is higher if selective treatment is performed for each type of infestation instead of using a broadcast herbicide on the whole surface. This work proposes a strategy w...

Journal: :Trends in plant science 2004
Chhandak Basu Matthew D Halfhill Thomas C Mueller C Neal Stewart

In spite of the large yield losses that weeds inflict on crops, we know little about the genomics of economically important weed species. Comparative genomics between plant model species and weeds, map-based approaches, genomic sequencing and functional genomics can play vital roles in understanding and dissecting weedy traits of agronomically important weed species that damage crops. Weed geno...

2014
Sebastian Haug Jörn Ostermann

In this paper we propose a benchmark dataset for crop / weed discrimination, single plant phenotyping and other open computer vision tasks in precision agriculture. The dataset comprises 60 images with annotations and is available online. All images were acquired with the autonomous field robot Bonirob in an organic carrot farm while the carrot plants were in early true leaf growth stage. Intra...

2015
A. N. Rao B. S. Chauhan

India has a wide range of agroclimates and soil types. The highly diverse agriculture and fanning systems are beset with different types of weed problems. Weeds cause 10-80% crop yield losses besides impairing product quality and causing health and environmental hazards. Invasive alien weeds are a major constraint to agriculture, forestry and aquatic environment. Crop-specific problematic weeds...

2004
Claus Dethlefsen

Claus Dethlefsen Dept. of Mathemati al S ien es Aalborg University Fr. Bajers Vej 7G 9220 Aalborg, Denmark Abstra t This paper onsiders spatial ount data from an agri ultural eld experiment. Counts of weed plants in a eld have been re orded in a proje t on pre ision farming. Interest is in mapping the weed intensity so that the dose of herbi ide applied at any lo ation an be adjusted to the amo...

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