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  <title>WEED BIOLOGY AND CONTROL</title>
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  <namePart>Pilipavicius, Vytautas</namePart>
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 <note>Weed control is one of the most intensive management practices in different production&#13;
systems in tropical regions and can influence both agricultural productivity and impact the&#13;
environment. Despite the importance of this issue, studies reporting the action of different&#13;
methods of weed control on soil physical properties and their effects on the management and&#13;
conservation of soil and water are scarce, requiring a greater understanding of the adequacy&#13;
of management systems. Weeds are considered one of the major constraints in crop production&#13;
and may substantially reduce yields when not controlled properly. Potential yield reductions&#13;
caused by uncontrolled weeds are estimated at Śś % to şś % depending on the crop, ecological&#13;
and climatic conditions [ŗ].&#13;
A  key  to  effectiveness  weed  management  is  a  holistic  approach  regarding  the  scenario&#13;
considered and must include a combination of tactics and practices in order to successfully&#13;
and economically reduce the potentially negative impacts inherent to weeds incidence [Ř].&#13;
There are numerous methods of mechanical control of weeds including mowing, cultivation,&#13;
hoeing, flaming, mulching, and hand weeding. Chemical control of weeds mainly consists of&#13;
using pre and post-emergence herbicides and soil fumigants [Ř]. Herbicides and tillage are the&#13;
dominant practices in many production systems due to efficiency and facilities for weed&#13;
control [ř]. However, these methods may be inadequate for weed control in tropical conditions&#13;
and may have negative impacts on soil and to the environment most of these impacts are&#13;
related to hydric erosion [Ś-ŝ] and soil compaction, which affect soil quality [Ş-ŗŗ]. Weed&#13;
management and cover crops also affects micropedological [Ŝ], biological [ŗŘ-ŗř], chemical soil&#13;
properties [ŗŘ, ŗŚ-ŗŝ].</note>
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 <subject authority="">
  <topic>EBOOK</topic>
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 <subject authority="">
  <topic>SOIL</topic>
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 <subject authority="">
  <topic>BIOLOGY</topic>
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 <classification>NONE</classification>
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  <physicalLocation>e-BOOK UPT Perpustakaan Instiper Yogyakarta</physicalLocation>
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  <recordIdentifier>517</recordIdentifier>
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