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 86 for “"low N"”.
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Genetic and agronomic approaches for improving nitrogen use and maize productivity
… are influenced by its grain yield at low N (check plot yield; no fertilizer N applied), and its response (i.e., increase in grain yield) to fertilizer N application. Maize N use can be improved by focusing on one or both of these parameters; however, better N use will not be sufficient …
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Combining Ability for Ear Prolificacy and Response of Prolific Maize (Zea May L.) Hybrids to Low Nitrogen Stress
… farmers in Sub-Saharan Africa still obtain low grain yields in maize largely due to low soil fertility. The soils are inherently low in nitrogen (N) that is required for the proper development of the maize plant. Currently there are no commercial cultivars for low N tolerance locally. The …
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Effects of Nitrogen and Potassium Fertilizer on Willamette Spider Mite (Eotetranychus willamettei) (Acari: Tetranychidae)
… Med-High N (1500 ppm N fertilizer), Med–Low N (500 ppm N fertilizer), and Low N (0-50 ppm N fertilizer). Four parameters were tested: male and female days to maturation, male and female survivorship to adult, adult female longevity and oviposition. Longevity and oviposition lab results …
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Effect of nitrogen fertilization on the physiological damage and subsequent recovery of mite-infested apple leaves
… and the subsequent recovery of leaf function following mite removal. Nitrogen (N) fertilization affected the visual damage, and the photosynthetic response of 'Imperial Delicious' apple leaves to mite feeding. Visual damage occurred first, and remained greatest on the low N treatment throughout …
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Impacts of Landscape Position and Nitrogen Fertilizer on Soils, Carbon and Nitrogen Leaching, and Greenhouse Gas Fluxes from Switchgrass Production in South Dakota
… design with 4 replications, 3 N rates (low, 0 kg N ha<sup>-1</sup>; medium, 56 kg N ha<sup>-1</sup>; and high, 112 kg N ha<sup>-1</sup>), and 3 landscape positions (shoulder, backslope, and footslope) in South Dakota, USA. This study showed that N rate did not impact soil pH, SOC, TN, …
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Long-term effects of fire on nitrogen cycling in a broad-leaf savanna, Kruger National Park, South Africa
… pools and availability and the maintenance of low fertility conditions. However, previous research in the Kruger National Park (KNP) and elsewhere found conflicting results for the effects of fire on nitrogen pools and transformation rates. The main aim of this study was to gain a better …
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Agronomic and marker-assisted breeding strategies for improving nitrogen use efficiency in maize
… ranged from 0.17 to 0.53 and 0.17 to 0.72 under low and high N conditions (0 and 252 kg N ha-1), respectively. The two major agronomic factors influencing a hybrid’s NUE performance are the tolerance to N stress (yield under unfertilized N conditions) and the yield response to additional N …
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Ammonia Emissions from Dairy Manure Storage Tanks Affected by Diets and Manure Removal Practices
… manure from dairy cows fed either normal or low N diet; and 2) seasonal effects on ammonia emission rates from stored scraped and flushed dairy manure. Four pilot-scale tanks were used for manure storage with different treatments - scraped manure for normal diet (NS), flushed manure for …
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Effects of Nitrate and Cytokinin on Nitrogen Metabolism and Heat Stress Tolerance of Creeping Bentgrass
… bentgrass (Agrostis stolonifera L.) is a major low-cut cool-season turfgrass used worldwide. The objectives of this research were to: 1) to gain insight into the diurnal fluctuation of N metabolism and effects of cytokinin (CK) and nitrate; 2) to characterize the impacts of N and CK on creeping …
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Evaluation of quickstand bermudagrass fertilized with two rates of nitrogen and grazed by sheep at different stocking rates in a temperate environment
… trials, paddocks were fertilized with 114 (low N) or 340 (high N) kg N ha-1yr-1 in split applications.
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Bone Mineral Density and Biomarkers of Bone Turnover in Young-Adult Females with and without Cognitive Eating Restraint
… in women with high (n = 31) and low (n = 34) CER scores. High CER participants possessed more fat mass (FM) (p < 0.05) and percent body fat (BF%) (p = 0.01) and consumed a greater number of servings of fruits and vegetables (p < 0.05) per day than the CER participants. No …
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Ionization of Rydberg Atoms at Patterned Electrode Arrays
… of surface ionization in the detection of low-n Rydberg atoms. The data are analyzed with the aid of a Monte Carlo model and further demonstrate the critical role that local surface fields can play in governing the nature of atom-surface interactions.
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Soil P availability limits legume persistence and distribution in the fynbos of the Cape Floristic Region
… N2-fixation enables legumes to overcome low N availability but not low P availability. I hypothesized that: legumes are less effective at acquiring P from sparingly soluble sources compared with members of Proteaceae and Restionaceae ; legume seeders occupy soils with a higher nutrient …
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Genetic Analysis of Nitrogen Use Efficiency and Related Traits in the IBMRIL X IHP1 Population of Maize
… NUE traits. The QTL for stover biomass at low N and kernel composition traits were shown to be the most environmentally stable. Candidate genes, including genes involved in cytokinin signaling and storage protein synthesis, among others, could be assigned to a portion of the QTL identified, …
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Biogeochemical effects of an invasive grass across a land-use gradient: linking alterations of nitrogen cycling to depleted soil carbon pools
… I quantified the effects of M. vimineum on belowground C and N dynamics and enzyme activities in forests across a 45-km urban-rural gradient in Southern Appalachia, USA. Consistent with previous reports, invasion was associated with depleted soil organic C pools and increased N availability. …
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Physiological Traits and Quantitative Trait Loci Associated with Nitrogen Use Efficiency in Soft Red Winter Wheat
… identify lines consistently expressing high or low NUE under two or more N rates in a total of 51 N-environments. The results indicated that significant genotype by N rate interactions were frequently observed when trials utilized at least three N rates and identified wheat lines with high and …
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Responses of a Louisiana oligohaline marsh plant community to nutrient loading and disturbance
… are co-dominant plant species in this marsh. Low N-loading additions resulted in increased S. patens cover. However, increased N loading did not result in a shift in plant community composition despite S. americanus consistently having higher leaf tissue N than S. patens. Our results indicate …
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Regulation of growth and storage product metabolism in cultured kernels of maize
… medium, while starch synthesis was reduced by low C supply. Extremely low or high concentrations of N also interfered with starch metabolism, possibly through a deficiency in metabolic enzymes or an osmotic imbalance. The relationship between starch and protein accumulation was dependent, at …
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Moderation of age-related cognitive decline in older adults
… This study sought to find a way to slow, halt, or reverse the age-related decline in Fluid Intelligence. Participants aged 50 and older with no prior experience working crossword puzzles worked crossword puzzles for 4 hours per week for 8 weeks. The Constant Group worked easy puzzles …
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Challenges and Opportunities for Denitrifying Bioreactors in the Mid-Atlantic
… N from drainage waters, but at relatively low rates constrained by low N loading that occurred in the absence of fertilizer application during continuous soy cropping at the site (10.0 kg NO3--N ha-1 yr-1 or 4.86 g NO3- -N m-3 d-1 on the basis of bed volume reached the bioreactor.) Removal …
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