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 22 for “"Phenological stages"”.
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Developing Techniques to Quantify Phenological Development of Smooth Brome (Bromus inermis Leyss.): Sampling Variability
… bluegrass. Understanding and identifying phenological stages of these grasses provides information necessary to effectively administer defoliation or other management treatments. I developed a method for USFWS staff to quickly estimate phenological leaf stage of smooth brome. My objectives …
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Special Reflectance of Hydrophytes
… made with an Exotach radiometer during three phenological stages, flowering and early seed, senescence, and early emergent. Reflectance data were analyzed to determine significant (≥.95) reflectance differences between species in each of four spectral regions during each phenological stage. …
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The phenological study of Securidaca longepedunculata, in the Nylsvley Nature Reserve, Limpopo Province, South Africa
Phenological observations were conducted through analysis of phenological phases and stages of 200 sampled S. longepedunculata plant individuals in the sandy soil areas of Nylsvley Nature Reserve, Limpopo Province, South Africa. Phenological stages comprised of onset, peak development and decline; …
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Spatial quantification of maize water stress using UAV-acquired data in smallholder farms of Swayimane in KwaZulu-Natal Province
… 3) estimate maize water stress across different phenological stages using UAVs acquired data in smallholder croplands. Particularly, the reviews assessed the distribution of publications, the types of methods used, and the types of results obtained, identifying gaps, challenges, and limitations …
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Polarimetric SAR for the monitoring of agricultural crops
… including the monitoring and the estimation of phenological stages of crops. The monitoring of crop phenology is fundamental for the planning and the triggering of cultivation practices, since they require timely information about the crop conditions along the cultivation cycle. Due to the …
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Mapping the maize growth period using multi-temporal sentinel 1 and 2 imagery: a case study in Kasisi area of Chongwe district.
… 2020. The analysis focused on tracking maize phenological stages— sowing, emergence, vegetative growth, and maturity—through biweekly observations of SAR backscatter and NDVI. Dual-polarized SAR data (VV and VH) were analyzed to detect structural and moisture changes in maize, while NDVI and …
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Mapping the maize growth period using multi-temporal sentinel 1 and 2 imagery: a case study in Kasisi area of Chongwe district.
… 2020. The analysis focused on tracking maize phenological stages— sowing, emergence, vegetative growth, and maturity—through biweekly observations of SAR backscatter and NDVI. Dual-polarized SAR data (VV and VH) were analyzed to detect structural and moisture changes in maize, while NDVI and …
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Water use of mature pecan orchards under semi-arid conditions
… be to adjust Kc curve according to observed phenological stages and that the approach would work better in orchards whereby Es is a minor component (≤20%) of ET. By measuring the two ET components separately it is possible that this approach could be applied to a wider range of orchards, …
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Phenology, canopy development, biomass and grain yield of annual canarygrass (Phalaris canariensis L.)
… This study investigated whether canaryseed phenological responses to air temperature were associated with grain yield instability. Two glabrous- and one pubescent-hulled canaryseed cultivars were compared with a cultivar each of a spring wheat with minimum vernalization requirement and an …
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Identification of clone x rootstock effects on cold hardiness and relevant dehydrins changes in Cabernet franc (Vitis vinifera L.)
… combinations throughout dormancy during the stages of cold acclimation, maximum hardiness and deacclimation. The research also looks at the protein expression of dehydrins which may impact cold hardiness. Four clone × rootstock combinations of Cabernet franc (214 × 101-14, 327 × 101-14, 327 × …
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Compensation of Cotton to Square Removal at Various Rates
… and effectiveness of COTMAN in tracking major phenological stages PHS, FF, and Cutout of cotton at various rates of square removal. In 1998, DPL 51 was planted on May first at the Tidewater Agricultural Research and Extension Center in Suffolk, Virginia. This was an ideal location, planting …
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Phenotypic plasticity in soybeans (glycine max (l.) merrill) associated with plant density and phenological stage at thinning
… varieties respond the same and at what phenological stage a soybean plant is able to exhibit adaptive plasticity or elasticity response after thinning. The relationship between plant density stress and plant performance was studied in soybean varieties. The objective of the study was to …
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Phenotypic plasticity in soybeans (glycine max (l.) merrill) associated with plant density and phenological stage at thinning
… varieties respond the same and at what phenological stage a soybean plant is able to exhibit adaptive plasticity or elasticity response after thinning. The relationship between plant density stress and plant performance was studied in soybean varieties. The objective of the study was to …
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Breeding strategies for wine grapes: From genetic analysis of agronomic traits to wine sensory evaluation
… seed, productivity traits, and phenological stages, confirming the influence of flower sex in the genetic determinism of these characters. Influence of berry size on wine composition was studied in two Tempranillo segregating progenies in Rioja and in Pinot noir clones grown in …
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Forage Potential of Seasonal Wetlands
… sedge were comparable to most grasses at similar phenological stages. At mid-summer, however, the nutritional quality of these 2 species is low and would make a hay adequate only as a base roughage. Whitetop nutritional quality is very poor during the latter portion of the growing season, while …
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Evaluation and improvement of CERES-Maize evapotranspiration simulations under full and limited irrigation treatments in northern Colorado
… during the non-water sensitive growth stages. Savings in crop evapotranspiration (ET) could then be leased to municipalities or other entities as desired. This dissertation examined the benefit of limited irrigation in comparison with full irrigation in the northern Front Range of …
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Assessment of plant hormone quantification as a new physiological trait for crop breeding using a new classification method for crop performance under drought
… tissue specificity (leaf and spike) and wheat phenological development (phenological stages). The present study of hormone (ABA and ethylene) quantification in wheat has shown that the genotypic variation in hormone signalling cannot be identified at every developmental stage of the plant. In …
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Evaluation of perennial ryegrass cultivars for dairy production under different pasture management
… were evaluated in a split-plot design at three phenological stages (pre-heading vegetative, reproductive and post-flowering vegetative). Pastures were managed under dairy grazing with irrigation and the annual nitrogen (N) fertiliser application rate was 325 kg N/ha. Compared with diploid …
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The role of Gamma-aminobutyric acid and Hydrogen peroxide in cell death in grape berry development
… the influence of GABA on cell death at different phenological stages will help grape growers to mitigate or reduce berry shrivel in specific cultivars prone to increased cell death and shrivel. GABA can be applied exogenously as part of their routine spray. These trials have the potential to delay …
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Interactive effects of n fertilization rate, cultivars and planting date under climate change on maize (zea mays l.) yield using crop simulation and statistical downscaling of climate models
… grain, and biomass yield were observed at phenological stages. The ANOVA for grain yield and yield parameters were computed using the sp.plot and ssp.plot functions in Agricolae R package. Significant differences between means were tested using Fisher-LSD Test (p<0.05). Site weather data, …
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