Download or read book Weed Management and Dynamics of Weed Seedbank in Fennel written by B. S. Gohil and published by LAP Lambert Academic Publishing. This book was released on 2014-02 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: India occupies prime position in seed spices and plays very important role in earning foreign exchange through export of seed spices. India is the world's largest producer, consumer and exporter of the spices. Fennel (Foeniculum vulgare Mill.) is an important seed spice. Gujarat ranks first with respect to production and productivity in India. Area under rabi direct seeded fennel is increasing day by day, because it is more profitable than other rabi crops like wheat, gram, cumin, mustard etc. Lake of production technologies and weed control particularly for rabi drilled fennel are important constraints in boosting up the production. Initial slow growth of seed spices leads to severe weed crop competition and reduces growth as well as yield as high as 91.4%. Application of herbicides in fennel effectively controls the weeds and increases seed yield from 43.2 to 86.9 %. Soil weed seedbank is reserve of viable seeds present on the surface and in the soil. The seedbank is an indicator of past and present weed populations in soil. It is the main source of weeds in agricultural fields. Therefore, knowledge of seedbank dynamics can help in designing weed management practices.
Download or read book Dynamics of Weed Populations written by Roger Cousens and published by Cambridge University Press. This book was released on 1995-11-24 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Puts the broad empirical knowledge on weed ecology into a theoretical framework.
Download or read book Soil Weed Seed Bank Population Dynamics and Methods for Measuring Weed Seed Populations in Soil written by Clark R. Wagner and published by . This book was released on 1992 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Weed Seeds and the Seedbank Implications for Weed Management written by Robert G. Hartzler and published by . This book was released on 1996 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bioeconomic Weed Management Maodels with Dynamics and Risk Effects written by Wei Wei and published by . This book was released on 1996 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Weed Fennel Competition Period written by Khuram Mubeen and published by LAP Lambert Academic Publishing. This book was released on 2013-01 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: WEEDS are considered as one of the serious pests in crop production. The weeds affect crops through allelopathy and competition. Weed competition is monitored for economic threshold in terms of density and duration. The duration for which weeds actively grasp the resources of crop should be critically monitored to avoid economic losses.Fennel being one of the important medicinal and multi purpose crop of winter season also require the critical competition period to be fixed for devising an eco friendly weed management plan. This book encompasses the weed competition effects in fennel and the time when it becomes crucial to manage weeds.
Download or read book An Investigation of Weed Seedbank Population Dynamics Under Various Tillage and Herbicide Regimes in a Rotational Sequence of Industrial Crops in Northern Greece written by Vasileios P. Vasileiadis and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seedbank Dynamics in Conservation Agriculture in Southwestern Zimbabwe written by Ronald Mandumbu and published by LAP Lambert Academic Publishing. This book was released on 2011-11-09 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: The influence of conservation agriculture (CA) on weed ecology has been a concern to many researchers across the world and that has culminated into this study. The trial was a factorial experiment with two factors laid out as a split plot design with tillage as the main plot factor and residue level as subplot factor with three replicates. Species richness (P>0.001) and grass weeds (P=0.003) were however significantly higher in the 0-5cm depth compared to the other two depths. A significant interaction (P=0.048) between tillage and sampling position revealed higher number of grass weeds in ripping under inter-row position compared to in-row positions and other tillage systems. All the nine main weed species and total weeds were not significantly affected by both tillage and residue levels. Eleucine indica (P=0.02), Setaria spp (P=0.004) and total weeds (P=0.003) were however higher in the 0-5cm compared to the other two depths. Although there were no direct effects of tillage and residue level on weeds the several interactions revealed that grass weeds, Setaria spp and E indica, C tridens and weed seed bank size will increase under CA systems.
Download or read book Impact of Tillage Systems on the Weed Seedbank and Weed Dynamics in Spelt written by Manon Puelacher and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effective Management of the Weed Seed Bank written by Mackenzie R. Trader and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: With herbicide efficacy declining as weeds continue to evolve and resist key modes of action, long-term, multi-faceted control practices need to be investigated. Two studies, involving cover crops and tillage, were implemented to understand how management practices influence the weed seed bank. The objectives of both studies were to examine long-term changes in the weed seed bank in response to tillage methods, fertility, and cover crops, and to analyze differences in distribution and community composition between individual species in the weed seed bank. To assess the weed community present in both seed banks, soil samples were collected, and a soil grow out was conducted in the greenhouse. To examine the field-emerged seed banks, percent coverage was collected for each weed species, crop residue, bare ground, and cover crop if present. The first study was established in 1970, evaluating four tillage systems: moldboard plow (CT), chisel plow (RT), alternative (AT), and no-tillage (NT). From 1970 to 1990, this study was continuous corn (Zea mays L.), but in 1991, soybeans (Glycine max L.) were added into the rotation, marking the beginning of the current corn-soybean rotation. Fertilizer treatments (no-fertilizer, nitrogen only, and NPK) were also evaluated. Each tillage and fertility treatment were replicated four times in the field in 6 m by 8 m plots. Weed seeds were found to be distributed within the soil profile differently by tillage treatment. No-till treatments maintained most of the seed bank near the surface of the soil. Based on the response of individual species to fertility treatments, community shifts in seed bank composition were found. LAMAM, STEME, and SIBVI had the greatest richness in NPK treatments compared to no fertilizer and nitrogen only. CERVU tended to favor treatments without any fertilizer. Tillage and fertility were also found to interact and influence species presence and community composition. The second study was established in 2013, to examine changes and differences in distribution and composition between individual species in the weed community in response to cover crop rotations and tillage. A split-plot design with three crop rotation systems was implemented: 1) corn (Zea mays L.)--cereal rye (Secale cereale L.)--soybean (Glycine max (L.) Merr.)--hairy vetch (Vicia villosa Roth) [CcrShv], 2) corn-cereal rye-soybean-oats + radish (Avena sativa L. + Raphanus sativus L.) [CcrSor], and 3) corn-no cover crop-soybean-no cover crop [NOCC], and two tillage treatments: conventional tillage and no-till. This field study also supported previous findings of higher weed diversity in no-till systems. ANOVA performed in R suggested species richness was significantly higher in no-tillage treatments in comparison to tillage treatments. For the field-emerged weed community, a pairwise comparisons test suggested cover crop treatments have significantly lower weed richness compared to plots with no cover crop present, but there was no interactive effect of tillage. 3-Way ANOVAs suggested time, tillage, and crop rotation influenced each weed species differently. Due to individual weed species having different requirements for germination and seed longevity, these data suggest the importance of developing and implementing a quality, integrated weed management program to maintain low levels of weed emergence and seed credits to the seed bank.
Download or read book Bioeconomic Weed Management Models with Dynamics and Risk Effects written by Wei Wei and published by . This book was released on 1996 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seedbank Dynamics of the Weed Echinochloa Crus galli L Beauv written by Michael Walton Hair and published by . This book was released on 1996 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conservation Buffers and Ecological Weed Management in Southeast Organic Cropping Systems written by Aaron Freeman Fox and published by . This book was released on 2013 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Steel in the Field written by Greg Bowman and published by . This book was released on 1997 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Weed Technology written by and published by . This book was released on 2003 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seeds written by Carol C. Baskin and published by Elsevier. This book was released on 2014-02-20 with total page 1601 pages. Available in PDF, EPUB and Kindle. Book excerpt: The new edition of Seeds contains new information on many topics discussed in the first edition, such as fruit/seed heteromorphism, breaking of physical dormancy and effects of inbreeding depression on germination. New topics have been added to each chapter, including dichotomous keys to types of seeds and kinds of dormancy; a hierarchical dormancy classification system; role of seed banks in restoration of plant communities; and seed germination in relation to parental effects, pollen competition, local adaption, climate change and karrikinolide in smoke from burning plants. The database for the world biogeography of seed dormancy has been expanded from 3,580 to about 13,600 species. New insights are presented on seed dormancy and germination ecology of species with specialized life cycles or habitat requirements such as orchids, parasitic, aquatics and halophytes. Information from various fields of science has been combined with seed dormancy data to increase our understanding of the evolutionary/phylogenetic origins and relationships of the various kinds of seed dormancy (and nondormancy) and the conditions under which each may have evolved. This comprehensive synthesis of information on the ecology, biogeography and evolution of seeds provides a thorough overview of whole-seed biology that will facilitate and help focus research efforts. - Most wide-ranging and thorough account of whole-seed dormancy available - Contains information on dormancy and germination of more than 14,000 species from all the continents – even the two angiosperm species native to the Antarctica continent - Includes a taxonomic index so researchers can quickly find information on their study organism(s) and - Provides a dichotomous key for the kinds of seed dormancy - Topics range from fossil evidence of seed dormancy to molecular biology of seed dormancy - Much attention is given to the evolution of kinds of seed dormancy - Includes chapters on the basics of how to do seed dormancy studies; on special groups of plants, for example orchids, parasites, aquatics, halophytes; and one chapter devoted to soil seed banks - Contains a revised, up-dated classification scheme of seed dormancy, including a formula for each kind of dormancy - Detailed attention is given to physiological dormancy, the most common kind of dormancy on earth
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
