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.
Results
Showing 1 to 15 of 15 for “"Crop coefficient"”.
-
Measurement of Cover Crop Evapotranspiration and Impacts on Water Management in Crop Production Systems
<p>Cover cropping is a popular agriculture practice that provides many benefits to the soil and subsequent cash crops. However, eastern South Dakota lies in a transitional climatic zone between the subhumid climate to the east and the semiarid climate to the west, an area susceptible to both excess …
-
Micrometeorological approaches to measure and model surface energy fluxes of irrigated citrus orchards in a semi-arid environment
… processes within one of the most relevant crop of the agricultural Sicilian context. The study was conceived as a long monitoring program of micrometeorological features of the study orange orchard at different spatial scales (plant, orchard, farm). Different micrometeorological methods, …
-
Analysis of Error in a Model Predictive Irrigation Controller
… thesis presents an analysis of sensitivity to crop model parameters in the MIT GEAR Lab’s new POWEIr irrigation controller with the goal of making it cheaper and easier to deploy and therefore more accessible. The analysis shows that, of the four crop parameters, the controller is most …
-
Irrigation scheduling: a soft adaptor to weather uncertainties and irrigation efficiency improvement initiatives
… (ET), plant available water (PAW) and crop coefficient (Kc). This was achieved through estimating Kc of pasture at different grazing rotations by field measurements and analysing irrigation and deep percolation under a range of PAW-based irrigation triggers by applications of …
-
Deficit Irrigation Strategies on young orange trees (cv Tarocco Sciara)
… irrigation, supplying 50-100% IR, depending on crop phenological phases and (iv) Surface drip irrigation, supplying 100% IR. The IR was calculated using the Penman-Monteith approach, by assuming a crop coefficient of 0.45, and correction coefficients accounting for the localized irrigation. On …
-
Effect of irrigation technology and plant density on cotton growth, yield, yield components, and water use efficiency
… water use efficiency, and grass-reference crop coefficients of cotton under different irrigation technologies and rainfed conditions. Four irrigation technologies, which were Low Energy Precision Application (LEPA), Low Elevation Spray Application (LESA), Mobile Drip Irrigation 1 (MDI1 with …
-
Creeping Bentgrass, Kentucky Bluegrass and Tall Fescue Responses to Plant Growth Stimulants Under Deficit Irrigation
… product (PP). The objectives were to determine crop coefficients (K<sub>c</sub>) for creeping bentgrass fairways and tall fescue home lawns, to determine if PGS application allowed for more water conservation, and to determine if they impacted physiological function and/or root morphology. A …
-
Design of an Affordable, Precise Irrigation Controller that Lowers the Barrier to Water- and Energy-Sustainable Agriculture
… production. Available techniques to bolster crop productivity, such as solar-powered drip irrigation (SPDI) and precision irrigation, are currently cost-prohibitive for farmers in low-and middle-income countries (LMICs), where food insecurity will be most severe. This thesis demonstrates one …
-
Evaluation of water use efficiency in upland Rice (Oryza sativa L) Under deficit irrigation)
… increasing greenhouse gas emission, maximizing crop water use becomes an important topic. Considerable research is being done on deficit irrigation. However, there is limited published work elaborating the water use efficiency of upland rice grown under deficit irrigation in Sub-Saharan Africa …
-
Evaluation of water use efficiency in upland Rice (Oryza sativa L) Under deficit irrigation)
… increasing greenhouse gas emission, maximizing crop water use becomes an important topic. Considerable research is being done on deficit irrigation. However, there is limited published work elaborating the water use efficiency of upland rice grown under deficit irrigation in Sub-Saharan Africa …
-
Evaluation and improvement of CERES-Maize evapotranspiration simulations under full and limited irrigation treatments in northern Colorado
… 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 Colorado, in both an …
-
'Hass' avocado tree water use and the effects of water stress on fruit development
… d⁻¹ and the lowest in June at 1.2 to 1.4 mm d⁻¹. Crop coefficients (Kc) were provided for each site, and the three sites had similar Kc values throughout the year, as all three orchards were considered mature, with >75% orchard shaded area. However, fruit load influenced tree water use. At all …
-
Water use of mature pecan orchards under semi-arid conditions
… fruit production, and as a result most orchard crops depend on supplemental irrigation, especially in areas in South Africa, where rainfall patterns are unpredictable and sparsely distributed. Through accurate quantification or estimation of crop water use or evapotranspiration (ET), the need …
-
Discerning Agronomic Best Management Practices for the Bioenergy Crop Camelina: A Focus on Water Requirements, Sowing Date and Method, and Nitrogen Application Rate in the Semiarid Environment of Northern Nevada
… [Camelina sativa (L.) Crantz], a reemerging crop that has been grown for decades in different parts of the world, has drawn considerable attention as a viable feedstock for biodiesel and jet fuel production, and it has widespread environmental adaptations, because of its ability to thrive …
-
Evaluating the Hydrologic and Thermal Performance of a Green Roof in Syracuse: Measurements and Modeling of a Full-Scale System
… and antecedent precipitation index (API). The crop coefficient (Kc) was obtained through backward least squares optimization. When soil moisture data are available, the Blaney-Criddle model and the Priestley-Taylor model together with SMEF and monthly Kc values are recommended for predicting ET …