نتایج جستجو برای: weed composition

تعداد نتایج: 270718  

2012
Ather Masoodi Fareed A. Khan

Alligator weed Alternanthera philoxeroides (Mart.) Griseb (Amaranthaceae) is being reported for the first time from Kashmir, India. Alternanthera philoxeroides was collected in 2008 during the vegetation survey of Wular Lake, a wetland of international importance under Ramsar convention. Alternanthera philoxeroides is a noxious invasive weed widespread throughout the world. We suggested that al...

2004
W. Thomas Lanini

Controlling weeds in organic farming systems requires the use of many techniques and strategies in order to achieve economically acceptable weed control and yields. Weeds can always be pulled or cut out, but the question is simply how much can a grower spend in terms of time and money to reduce weed pressure. The more a grower is able to reduce weed pressure (seed and perennial propagules) the ...

2010
V. D. Damsteegt E. N. Postnikova

V. D. Damsteegt, E. N. Postnikova, and A. L. Stone, Foreign Disease-Weed Science Research Unit, ARS, USDA, Frederick, MD 21702; M. Kuhlmann, University of Maryland, College Park; C. Wilson, University of Wisconsin, Madison; A. Sechler and N. W. Schaad, Foreign Disease-Weed Science Research Unit, ARS, USDA, Frederick, MD 21702; R. H. Brlansky, CREC, IFAS, UFL, Lake Alfred, FL 33850; and W. L. Sc...

آبادیان, هدی , عباسی, رحمت, پیردشتی , همت‌اله, یارنیا, مهرداد,

In order to study the intercropping of basil (Ocimum basiilicum L.) and cowpea (Vigna unguiculata  L.) under different levels of nitrogen supply and weed competition conditions, a field experiment was carried out in split-split plot arrangement based on a randomized complete block design with three replications during 2010 and 2011 at Sari Agricultural Science and Natural Resources University. ...

2008
Ali M. Sadeghi James L. Starr John R. Teasdale Richard C. Rosecrance Randy A. Rowland

Weeds compete with crops for belowground resources; however, there is little detailed information on relative dynamics of soil water during competitive interactions. This research was conducted to determine changes in soil-water storage (CSWS) in rain-fed no-tillage corn (Zea mays L.) production in the presence or absence of weed competition over two droughty growing seasons. Weeds at the exper...

Journal: :Agronomy 2022

Weed management in large-scale solar photovoltaic (LSS-PV) farms has become a great concern to the industry due scarcity of labour and ever-increasing price pesticides, which opens up possibilities for integrated farming, also known as agrivoltaics. Improper weed control may have multiple negative impacts such permanent shading module surface, pest housing damages communication cables, even bus...

2006

Returns of an individual enterprise in the short term are usually measured through a gross margin budget, which is determined by subtracting factors such as the cost of weed control (both herbicide and non-herbicide) and other inputs (eg seed and fertiliser) from gross income (calculated as crop yield multiplied by grain price). Crop yield is directly influenced by weed density, which itself is...

Journal: :Agriculture 2021

Crop residues management has great effects on weeds in croplands. To understand the weed responses to crop and impact yield, a field trial with three strategies been conducted North China Plain since 2008. Weed community composition structure across species, morphological types, life forms, levels were investigated during 2019–2020. The results show that retention significantly decreased densit...

Journal: :Plant Soil and Environment 2021

The paper presents species richness and composition of arable weed vegetation in the region West Bohemia (Czech Republic) different types farming (conventional organic) grown crops (winter spring cereals, wide-row crops). During field survey years 2007 to 2017, 105 phytocoenological relevés were recorded. average one relevé was significantly higher organic farming, as well total cover. lowest f...

Journal: :journal of agricultural science and technology 2010
h. ghadiri n. bagherani torshiz

laboratory experiments were performed to determine the effect of various scarification treatments at four temperature regimes on germination of licorice seeds . a randomized complete block design with four replications was used. germination counts were made every day for 2 weeks. at 50c, none of the chemically and mechanically scarified and non scarified seeds germinated. at 15, 25, and 350...

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