Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"weed competition"”.
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Ecology of wild radish (Raphanus raphanistrum) : crop-weed competition and seed dormancy.
… were able to suppress seed production of this weed species.
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Composted dairy manure and arbuscular mycorrhizae influence on weed competition and potato yield
… compost may also impact microbial communities, weed competition, weed seed fecundity, mortality, and dormancy. Potatoes were grown in field plots amended with 0, 4, or 8 t carbon (C) ha<super>-1</super> of compost during the summer under weed-free conditions, and in competition with common …
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The agronomic and economic performance of flax in Iowa
… concerned about adequate fertility and weed management when adding flax to their crop rotations. Our objective was to evaluate flax response to N rate and source as well as to ambient weed competition when following either soybean or corn in rotation. The particular response variables …
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The effect of plant population, spatial arrangement and weed competition on growth and yield of dwarf beans (Phaseolus vulgaris L.) : a thesis submitted in partial fulfilment of the requirements for the degree of Master of Agricultural Science in the University of Canterbury [Lincoln College]
… was carried out to determine the extent to which competition between weeds and a bean crop at constant spacing influenced yield of both green beans and dry seed. Plots were kept free of weeds for 0, 3, 6, and 9 weeks after emergence. A continuous weeding treatment was also included. Considerable …
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A crop phenology model for Windows
An object oriented model for simulating crop and weed phenology under field conditions has been developed for educational and research purposes. The model can be used to study seasonal dynamics of crop and weed canopies which are important in controlling crop photosynthesis, evapotranspiration, …
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The potential of Short Rotation Coppice (SRC) willow (Salix L.) as a biomass crop in Orkney.
… soil. Moreover fertiliser applications increase weed competition of the crop and its susceptibility to damage by the wind. The disease willow rust (Melampsora spp.) is present but not currently at any level to cause concern.<br/>However, as a disease prevention strategy SRC plantations in Orkney …
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Phenological and Cultural Studies of Common Dandelion (Taraxacum officinale Weber)
… were: 1) hand cultivation to control weed competition, and 2) overseeding with Kentucky bluegrass (Poa pratensis L.). Sub-treatments were: 1) no clipping, 2) clipping at 4 cm each week, 3) clipping at 4 cm every two weeks, 4) clipping at 8 cm each week, and 5) clipping at 8 cm every …
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Red morningglory (Ipomoea coccinea L.) biology and management in sugarcane
… In the sugarcane (Saccharum spp. hybrids) and weed competition study, red morningglory infestation in November, based on the degree of wrapping of sugarcane stalks, was 24 % when plots were maintained weed free until late June and allowed to re-infest thereafter, but was no more than 9% when …
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Evaluating native warm-season grass and wildflower mixtures for beef cattle production in the Mid-Atlantic
… The small plot experiments experienced extreme weed competition in the establishment year, although plots with higher NWSG content had fewer weeds over time. Floral production was comparable across treatment, which suggests lower WF seeding rates can generate comparable pollinator resources. …
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Evaluation of Yield and Agronomic Performance of Leafed and Semi-leafless Pea Blends
… resistance of leafed pea and also gains a weed competition advantage with the leafed blend. There is some evidence that growing blends of leafed and semi-leafless pea may lead to higher crop yield than sole crops of either leaf type. However, previous studies used two different …
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Intercropping for food, fiber, and fuel on pine plantations in Virginia and North Carolina
… the south can increase site utilization, reduce weed competition, provide annual or semi-annual revenues early in the timber rotation, ameliorate the soil, and diversify production. Research was initiated to determine the feasibility of using various plants as intercrops on pine plantations in …
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Variable weather and implications for herbicide efficacy and yield loss due to weeds
… 21st century. Variable weather impacts crops, weeds, and their management; however, empirical study of these phenomena has been piecemeal and limited to a handful of site years (e.g. generally 2 to 4). This research was developed to shed light on how future climate variability in the Midwest …
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Soil erosion and conservation potential of row crop farming in mountainous landscapes of South Korea
… multiple vegetation parameters of crops and weeds of conventional and organic farms cultivating bean, potato, radish, and cabbage, and we simulated long-term soil loss rates with the Revised Universal Soil Loss Equation (RUSLE). We found that organic farming reduced erosion for radish, as a …