Дисертації з теми "Weedy biomass"
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Pittman, Kara Brooke. "High Residue Cover Crops for Annual Weed Suppression in Corn and Soybean Production and Potential for Hairy Vetch (Vicia villosa) to be Weedy." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/82041.
Повний текст джерелаMaster of Science in Life Sciences
Pittman, Kara. "High Residue Cover Crops for Annual Weed Suppression in Corn and Soybean Production and Potential for Hairy Vetch (Vicia villosa) to be Weedy." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/82041.
Повний текст джерелаMaster of Science in Life Sciences
Davis, Philip Browning. "The invasion potential and competitive ability of Camelina sativa (L.) Crantz (camelina) in rangeland ecosystems." Thesis, Montana State University, 2010. http://etd.lib.montana.edu/etd/2010/davis/DavisP0510.pdf.
Повний текст джерелаTolson, Joshua Allen. "THE EFFECT OF INTEGRATED WEED MANAGEMENT STRATEGIES ON WEED POPULATIONS AND BIOMASS, PASTURE PRODUCTIVITY, ECONOMIC RETURNS, AND FORAGE QUALITY WITH AND WITHOUT GRAZING." UKnowledge, 2012. http://uknowledge.uky.edu/pss_etds/4.
Повний текст джерелаMuzangwa, Lindah. "Cover crop biomass production and effects on weeds and soil fertility in a maize-based conservation agriculture system." Thesis, University of Fort Hare, 2011. http://hdl.handle.net/10353/484.
Повний текст джерелаBedet, Charlotte. "Soil fertility, crop nutrients, weed biomass and insect populations in organic and conventional field corn (Zea mays L.) agroecosystems /." The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488196781734832.
Повний текст джерелаGavazzi, Michael Joseph. "The Influence of Elevated Carbon Dioxide and Water Availability on Herbaceous Weed Development and Planted Loblolly Pine (Pinus taeda) and Coppice Sweetgum (Liquidambar styraciflua) Growth." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36813.
Повний текст джерелаWeed growth had an effect on tree growth, but the amount of variation in tree biomass explained by weed biomass was very low. It appears that the tree seedlings benefited more from available resources than the herbaceous weeds. The influence of competition with loblolly pine and elevated CO2 did not have an influence on total weed biomass; however, it did favor C3 weed community development regardless of water availability. This suggests that weed community composition may shift toward C3 plants in a future elevated CO2 atmosphere.
Loblolly pine height, diameter, needle, shoot and total biomass were significantly greater in the well watered treatment than the water stressed treatment. Pine root, needle, shoot and total biomass were significantly greater in the elevated treatment than the ambient treatment. While not significant, root biomass of water stressed pine seedlings was 63% greater in the elevated CO2 treatment than the ambient treatment. There was a significant water and CO2 interaction for pine root:shoot ratio. Under elevated CO2, root:shoot ratio was significantly greater in the water stressed treatment than the well watered treatment. In contrast, root:shoot ratio in the ambient treatment was nearly identical under both water treatments. These results indicate that loblolly pine will respond favorably in an elevated CO2 atmosphere, even under dry conditions.
The coppiced sweetgum seedlings responded favorably to well watered conditions
with significant increases in leaf area, specific leaf area, leaf, shoot and total
biomass compared to water stressed conditions. Leaf, root, shoot+stump and total
biomass of sweetgum significantly increased and specific leaf area decreased under
elevated CO2 compared to ambient CO2, but differences were smaller than previous
findings. This indicates that coppicing may dampen the growth response to
elevated CO2, at least in the initial growth stage after coppicing.
Master of Science
Gonçalves, Gerlândio Suassuna. "Período crítico de interferência de plantas infestantes e seus efeitos sobre as características fisiológicas e nutricionais em laranjeira ‘pera’, no Amazonas." Universidade Federal do Amazonas, 2015. http://tede.ufam.edu.br/handle/tede/4038.
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The determination of the critical period of weed interference is very important because it indicates the phase of the culture in which the management of weed shall be performed, furthermore, it limits the number of weeding and other management practices to the minimum, allowing the plant express its maximum yield potential at lower cost to the producer. The aim of this study was to identify the critical period of weed interference in the culture of orange ‘Pera’ tree by parameters valuated: falling immature fruits, productivity, juice yield, juice chemical characteristics, production of photosynthetic pigments and proline in leaves of orange tree, identify the weed species and their accumulation of biomass and nutrients. The experiment was installed in october 2012 and conducted until september 2014, in Rio Preto da Eva - AM. To define the treatments with and without interference of weeds in orange tree, was taken as reference the water balance in the region. The interference periods were defined considering the degree of water availability or absence in the soil: from october to january; february to may; june to september; october to may; october to January, june to september and february to september; period without weed interference (control treatment), and without producer management practices interference. The control of weed was obtained using the herbicide glyphosate (1.720 g ha-1 e.a.). The characteristics evaluated were: Falling immature fruits, productivity, juice yield, total soluble solids (SS), titratable acidity (TA), technological index (TI), chlorophyll production and carotenoids, proline content, biomass accumulation and nutrients by weeds. The treatment with weed interference in the period from october to may increase the fruit drop, reduced the number of fruits per plant and productivity, promoted an increase in soluble solids (SS), total acidity (TA) and reduced values of SS/TA ratio. The different periods of weed interference did not promote significant changes in the contents of chlorophyll a, b, total and of carotenoids in orange tree leaves, but viii promoted significant changes in the free proline content in the leaves. The weed species differ from each other in the accumulation of biomass and nutrients. The critical period of weed interference to the culture of orange ‘Pera’ was from october to may.
A determinação do período crítico de interferência de plantas infestantes é muito importante, pois seu conhecimento indica a fase da cultura em que o manejo das infestantes deve ser realizado, limita o número de capinas e de outras práticas de manejo ao mínimo necessário, possibilitando que a planta expresse o seu máximo potencial produtivo com menor custo para o produtor. O objetivo deste trabalho foi identificar o período crítico de interferência de plantas infestantes na cultura da laranja ‘Pera’ pela avaliação dos parâmetros: queda de frutos imaturos, produtividade, rendimento em suco e suas características químicas, produção de pigmentos fotossintéticos e de prolina nas folhas de laranjeira e identificar as espécies infestantes assim como a acumulação de biomassa e de nutrientes por elas. O experimento foi instalado em outubro de 2012 e conduzido até setembro de 2014, no município de Rio Preto da Eva – AM. Para definição dos tratamentos de interferência ou não de plantas infestantes em laranjeira, tomou-se como referência o balanço hídrico da região. Os períodos de interferência estabelecidos levaram em consideração o grau de disponibilidade ou não de água no solo: de outubro a janeiro; fevereiro a maio; junho a setembro; de outubro a maio; outubro a janeiro e de junho a setembro; fevereiro a setembro; sem interferência das plantas infestantes – tratamento controle; e sem interferência com práticas de manejo do produtor. O controle das plantas infestantes foi obtido com uso do herbicida glyphosate (1.720 g ha-1 e.a.). As características avaliadas foram: queda de frutos imaturos, produtividade, rendimento em suco, sólidos solúveis totais (SS), acidez titulável (AT), índice tecnológico (IT), produção de clorofila e de carotenoides, teor de prolina, acumulação de biomassa e nutrientes pelas infestantes. O tratamento com interferência das plantas infestantes no período de outubro a maio aumentou a queda de frutos prematuros, reduziu o número de frutos por planta e a produtividade, promoveu incremento dos sólidos solúveis (SS), da acidez total (AT) e reduziu vi os valores da relação SS/AT. Os diferentes períodos de interferência de plantas infestantes não promoveram alterações significativas nos teores de clorofila a, b, total e de carotenoides em folhas de laranjeira, mas promoveram mudanças significativas no conteúdo de prolina livre nas folhas. As espécies infestantes diferiram entre si na acumulação de biomassa e de nutrientes. O período crítico de interferência de plantas infestantes para a cultura da laranjeira foi de outubro a maio.
Musunda, Bothwell Zvidzai. "Evaluation of cover crop species for biomass production, weed suppression and maize yields under irrigation in the Eastern Cape Province, South Africa." Thesis, University of Fort Hare, 2010. http://hdl.handle.net/10353/347.
Повний текст джерелаMashingaidze, Nester. "Weed dynamics in low-input dryland smallholder conservation agriculture systems in semi-arid Zimbabwe." Thesis, University of Pretoria, 2013. http://hdl.handle.net/2263/24412.
Повний текст джерелаThesis (PhD)--University of Pretoria, 2013.
Plant Production and Soil Science
unrestricted
Setter, Cassandra Marie. "Weed Control Effects on Native Species, Soil Seedbank Change, and Biofuel Production." Thesis, North Dakota State University, 2011. https://hdl.handle.net/10365/29318.
Повний текст джерелаAttarian, Amir. "Weed management for giant reed (Arindo donax) biomass production in Oregon." Thesis, 2013. http://hdl.handle.net/1957/38098.
Повний текст джерелаGraduation date: 2013
Conley, Shawn P. "Effect of cultivar, row spacing, and weed management on weed biomass, potato ("Solanum tuberosum" L.) yield, net crop value, and crop canopy development." 1999. http://catalog.hathitrust.org/api/volumes/oclc/42195379.html.
Повний текст джерелаTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 49-54).
Wijesuriya, Wipulal Sardha. "Investigation of the relationships between biomass reduction, soil disturbance, soil nutrients and weed invasion in basalt plains native grassland remnants in Victoria, Australia." Thesis, 1999. https://vuir.vu.edu.au/15240/.
Повний текст джерелаKumalasari, Nur. "Diversity of rice weeds vegetation and its potential as local forage resource in Java, Indonesia." Thesis, 2014. http://hdl.handle.net/11858/00-1735-0000-0022-5EEF-8.
Повний текст джерелаCogdill, Todd Joseph. "Impact of Herbicides on Winter Canola (Brassica napus L.) Production and Fatty Acid Composition in South Texas." Thesis, 2013. http://hdl.handle.net/1969.1/149274.
Повний текст джерела