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Effects Of Simulated Drift Of Glyphosate, Imazethapyr, Glufosinate, And Imazamox To Non-Transgenic Rice, Justin Brian Hensley
Effects Of Simulated Drift Of Glyphosate, Imazethapyr, Glufosinate, And Imazamox To Non-Transgenic Rice, Justin Brian Hensley
LSU Doctoral Dissertations
Four studies were conducted at the LSU AgCenter Rice Research Station near Crowley, Louisiana to evaluate the effects of simulated herbicide drift on ‘Cocodrie’ rice. Herbicides were applied at 6.3 and 12.5% of the labeled usage rate of 863 g ae/ha of glyphosate, 70 g ai/ha of imazethapyr, 493 g ai/ha of glufosinate, and 44 g ai/ha of imazamox. Herbicides were applied to rice at the 1-tiller, panicle differentiation (PD), boot, and physiological maturity growth stages. Spray volume varied proportionally to herbicide dosage and was 15 L/ha for the 6.3% rate and 29 L/ha for the 12.5% rate using 234 …
Molecular, Statistical And Genetic Analyses Of Complex Agronomic Traits In Rice, Samuel Agbayani Ordonez Jr.
Molecular, Statistical And Genetic Analyses Of Complex Agronomic Traits In Rice, Samuel Agbayani Ordonez Jr.
LSU Doctoral Dissertations
Novel molecular and statistical approaches are needed for identification of DNA markers associated with complex traits in rice. The first research objective was to evaluate mixed-model and multiple regression approaches for their ability to identify molecular markers associated with complex traits in rice. A combined mixed model and multiple regression approach was optimal for selecting the smallest number of DNA markers associated with relatively high R2 values and for consistency with previous mapping studies. Support Vector Regression (SVR) was evaluated in the second research objective for the ability to generate high levels of accuracy and power for markers associated with …
Integrated Management Of Creeping Rivergrass In Rice, Sunny Lynn Bottoms
Integrated Management Of Creeping Rivergrass In Rice, Sunny Lynn Bottoms
LSU Doctoral Dissertations
Studies were conducted to evaluate growth and reproductive capabilities of creeping rivergrass in response to flood depth, burial depth, desiccation, herbicide programs and interference with rice. Seed production of a natural population of creeping rivergrass was 0.8 seeds per panicle. Germination was 45% and seedling vigor was poor. Flowers from surviving seedlings were male sterile. A 5 and 10 cm flood depth increased fresh weight, stolon length, and node production of creeping rivergrass compared with non-flooded plants. However, depths at 15 and 20 cm did not differ from no-flood; therefore permanent flooding should be delayed until rice can survive a …