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 20 of 114 for “"Yield Losses"”.
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Effect of Resistance Type on the Development of and Yield Losses Due to Northern Corn Leaf Blight
The effect of resistant type on the development of northern leaf blight (NLB), caused by Exserohilum turcicum, was studied on three dent corn (Zea mays L.) hybrids: A619 x A632, B73 x Oh545 and Mo17 x B73. Two nearly isogenic versions of each hybrid were used, one version carrying the resistance …
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Epidemiology of Northern Corn Leaf Blight as Affected by Host Resistance and Yield Losses Following Simulated Epidemics
Made available in DSpace on 2014-12-14T04:37:45Z (GMT). No. of bitstreams: 1 7913585.pdf: 3893794 bytes, checksum: f0b34bd5bb51b161b42f25ea899dfd31 (MD5) Previous issue date: 1978
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Making More Cars with Less Metal
Reducing sheet metal yield losses in automotive manufacturing would reduce material demand, providing environmental and financial benefits. This thesis explores material efficiency from four perspectives: 1. The opportunity for improvement: A part by part analysis of yield losses for every sheet …
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Economic Feasibility of a Biological Control Cottage Industry in Niger
… region of Niger are vulnerable to high millet yield losses due to the millet head miner, and their pest control options are extremely limited. Researchers have begun to support small businesses which sell a beneficial insect (Habrobracon Hebetor) that is very effective in limiting millet yield …
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The ecology of Brassica napus
… are strong competitors and produce large seed yields, however seed shattering during harvest creates large volunteer seedbanks. The segregation of hybrid trait and changes in variability of traits may allow successive generations of volunteer B. napus weeds to display different levels of …
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Response of Soybean Iron and Manganese Deficiency
… chemical fertilizers have been used to control yield losses associated with these deficiencies, genetic resistance is more reliable and effective. Identification of resistant cultivars requires an understanding of the genetic inheritance for resistance, knowledge of the physiological mechanisms …
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Inheritance of Resistance of Maize to Infection by Barley Yellow Dwarf Viruses
… middle to late June in order to limit potential yield losses.
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Interaction Between Weeds and Insect Pests With Snap Beans (Phaseolus Vulgaris L.)
… model for both relative leaf area and snap yield loss. The yield losses were dependent on the year and emergence time. Maximum yield losses at 8-weeds/m row ranged from 29 to 53% in snap bean plots with redroot pigweed, and 46 to 50% in plots with crabgrass. In crabgrass plots, coefficient A …
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Analyses of Interactions Between Soybean and Phialophora Gregata
… (Glycine max (L.) Merr.), is critical to prevent yield losses in the northern USA. The objective of the first phase of this study was to determine the effect of P. gregata source on aggressiveness and physiologic specialization. Isolates were derived after two cycles of infection from four host …
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Penentuan ambang kendali kepik coklat (Riptortus anulicornis) pada tanaman kedelai (Glycine max (L) Merrill) varietas Wilis
… of seeds and seed weight, the rate of loss of yield, control threshold value R. anulicornis on soybean plants. The results showed that soybean yield losses due to infestation of brown ladybugs expressed by the regression equation Y = 15.24 x - 10.98 and the value of R2 = 0.946 [y = yield losses …
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Evolution of Bacillus thuringiensis Maize Yields in South Africa
… the potential impact of insect resistance on yields and estimates the economic and food availability impacts of genetic deterioration of Bt maize. Using data from South African National Maize Cultivar trials from 1989-2018, yield gains from Bt are observed to peak for Bt maize in 8 provinces …
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Understanding and managing Frogeye Leaf Spot through network-based modeling in soybean
… a significant threat to soybean production, with yield losses of 30 - 60%. Traditional mass-action models assume homogeneous mixing, which rarely holds in real fields and limits their ability to gain insights into FLS management. To address this, we developed a network-based model that …
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The epidemiology and management of fungal- and nonpersistent aphid-borne plant viruses in a Mediterranean type climate
… recovered while plants infected later incurred yield losses (up to 45%). In contrast, plants of C. arietinum infected with AMV when young were killed. L. culinaris plants infected with AMV and CMV suffered high yield losses (up to 90%) dependent on the age of plants when they were infected. …
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Predicting Pallet Part Yields From Hardwood Cants
… for accurately predicting hardwood pallet part yield as a function of raw material geometry and grade, processing equipment, and pallet part geometry, 2) to develop a model for accurately predicting raw material costs for hardwood pallet parts as a function of yield, 3) to examine current pallet …
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Sources and Inheritance of Resistance to Anthracnose Stalk Rot of Corn
… potential for anthracnose stalk rot to cause yield losses. Host genetic resistance has been successfully used to reduce loss due to Diplodia and Gibberella stalk rots of corn, but this resistance does not appear to be effective in controlling anthracnose stalk rot. Knowledge about available …
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Simple sequence repeat polymorphism screening for resistance to Cercospora Arachidila in groundnut(Arachis Hypogaea)Genotypes
… Cercospora arachidicola. C. arachidicola causes yield losses which on interaction with other pests and/ or diseases and favourable weather conditions aggravate yield losses in Sub–Saharan Africa. The utilisation of chemical control methods is not economically feasible for the small holder farmer …
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Economic costs of extreme heat on groundnut production in the Senegal Groundnut Basin
… between extreme temperatures and groundnut yield. This leads to financial losses for farmers, with adaptation strategies such as input level adjustments providing partial mitigation. Future projections indicate further increases in extreme heat degrees days, resulting in significant yield …
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Efeito do extrato aquoso das folhas de Nim indiano (Azadirachta indica) sobre o crescimento inicial de plantas daninhas.
Weeds pose serious problems for crops by multiple losses causing yield losses by competition for water, light, nutrients and space. Allelopathy is a biological phenomenon that occurs when a plant species releases to the environment substances that may inhibit germination and / or establishment of …
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Efeito do extrato aquoso das folhas de nim indiano (Azadirachta indica) sobre o crescimento inicial de plantas daninhas.
Weeds pose serious problems for crops by multiple losses causing yield losses by competition for water, light, nutrients and space. Allelopathy is a biological phenomenon that occurs when a plant species releases to the environment substances that may inhibit germination and / or establishment of …
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Relationships between somatic cell counts and milk production in dairy cattle
… between somatic cell count and daily milk yield was shown to exist. The relationship indicated daily milk yield declined more rapidly as somatic cell counts increased from 50 X 10³ through 300 X 10³ cells per ml compared to daily milk decline as somatic cell counts rose from 400 X 10³ …
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