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Full-Text Articles in Agriculture
Evaluation Of Three Estrous Synchronization Protocols In Beef Heifers1, R. N. Funston, R. J. Lipsey, T. W. Geary, R. P. Ansotegui
Evaluation Of Three Estrous Synchronization Protocols In Beef Heifers1, R. N. Funston, R. J. Lipsey, T. W. Geary, R. P. Ansotegui
West Central Research and Extension Center, North Platte
Objectives of this study were to evaluate synchronization, conception, and pregnancy rates of heifers synchronized with melengestrol acetate (MGA)-prostaglandin F2α (PGF2α,), Select Synch, or Select Synch preceded by MGA (MGA-Select Synch). Heifers in the MGA-PGF2α group (n = 209; BW = 378 kg) received MGA (0.5 mg/ d per heifer) for 14 d and PGF2α (25 mg) 19 d later. Select Synch heifers (n = 213; BW = 374 kg) received gonadotropin- releasing hormone (GnRH; 100 μg) followed by PGF2α (25 mg) 7 d later. The MGA-Select Synch heifers …
Lithospermum Incisum 'Pawnee' Germplasm, Dale T. Lindgren, Daniel Schaaf
Lithospermum Incisum 'Pawnee' Germplasm, Dale T. Lindgren, Daniel Schaaf
West Central Research and Extension Center, North Platte
Lithospermums are a group of spring-flowering herbs that belong to the Boraginaceae Juss. Correll and Johnston (1977) reported there are about 40 species of Lithospermum L. in North America and an additional 20 species outside of North America. Flower color can vary from yellow to greenish-yellow, to orange or white, depending on species. There are four species native to the Great Plains: L. carolinense MacMill., L. canescens (Michx.) Lehm., L. latifolium Michx., and L incisum Lehm. Lithospermum arvense L., non Bove ex DC., Ledeb. nor Thunb. is an introduced, naturalized species of the Great Plains, native to Eurasia. …
Soil Temperature Under A Dormant Bermudagrass Mulch: Simulation And Measurement, Simon Van Donk, Ernest W. Tollner, Jean Steiner, Steven Evett
Soil Temperature Under A Dormant Bermudagrass Mulch: Simulation And Measurement, Simon Van Donk, Ernest W. Tollner, Jean Steiner, Steven Evett
West Central Research and Extension Center, North Platte
The ENergy and WATer BALance (ENWATBAL) model is a mechanistic, numerical model that simulates soil water and temperature profiles, evaporation from soil, and transpiration from crops, but it does not simulate the effects of a mulch layer. Surface vegetative mulches are becoming more common, especially in reduced -tillage systems, limiting the model’s applicability. Our objective was to modify ENWATBAL to enable physically based simulation of the effects of a dense mulch. As a preliminary evaluation of the model, soil temperatures simulated with the modified model were compared with those measured at Watkinsville, Georgia, in Cecil sandy loam ( …
Natural Product Herbicides For Control Of Annual Vegetation Along Roadsides, Stephen L. Young
Natural Product Herbicides For Control Of Annual Vegetation Along Roadsides, Stephen L. Young
West Central Research and Extension Center, North Platte
Natural product herbicides for vegetation control are being considered as alternatives to synthetic herbicides by many public agencies. Studies were conducted along roadsides at the Hopland Research and Extension Center (HREC) in 2001 and 2002 and on California State Route 29 (SR29) in 2002 to evaluate acetic acid, pine oil, and plant essentials compared with glyphosate for control of herbaceous vegetation. In 2001, annual grass control after a single application of pine oil at HREC was 40% or less effective, whereas acetic acid was at least 79% effective. A second application of pine oil or acetic acid did not control …
Influence Of Seed Stratification And See Age On Emergence Of Penstemon, Dale T. Lindgren, Daniel Schaaf
Influence Of Seed Stratification And See Age On Emergence Of Penstemon, Dale T. Lindgren, Daniel Schaaf
West Central Research and Extension Center, North Platte
Studies were conducted to evaluate the effect of stratification and seed age on percent seedling emergence of Penstemon. Emergence differences occurred between the eight Penstemon selections, as well as between seed stratification treatments and seed age. Seed stratification significantly increased emergence. Emergence vaired from 0% with 1-year-old seed Penstemon digitalis with no stratification, to 72.8% emergence with 2-year-old seed of P. angustifolius with 10 weeks of stratification. Seedlings from 3- to 4- year-old seed generally emerged as well as or better than with 1- and 2-year-old seed. Percent emergence varied significantly with stratification, seed age, and species. Some emergence …