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Full-Text Articles in Agriculture
Litter Decomposition And Root Production In Response To Grazing On Sandhills Subirrigated Meadow, Ben W. Beckman
Litter Decomposition And Root Production In Response To Grazing On Sandhills Subirrigated Meadow, Ben W. Beckman
Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research
Stocking density can be manipulated by management factors including herd size, pasture size, and grazing period length. Ultrahigh stocking density (mob grazing) is commonly characterized at 200,000 kg animal live weight ha-1 or higher with multiple movements of livestock per day. Practitioners claim increased plant production, soil development, and nutrient cycling rates because of high trampling percentages resulting from ultrahigh socking densities. This study was conducted on subirrigated meadow in the Nebraska Sandhills in 2012 and 2013 to determine grazing method effect on annual root production and litter decomposition. Stocking rates were held constant while stocking densities varied by …
Control Of Herbicide-Resistant Volunteer Corn In Herbicide-Resistant Soybean, Parminder Chahal
Control Of Herbicide-Resistant Volunteer Corn In Herbicide-Resistant Soybean, Parminder Chahal
Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research
Volunteer corn is a problem weed in soybean fields because it reduces yield and seed quality, and potentially harbors insects, pests, and diseases. Several pre-packaged herbicides have been registered in soybean in recent years, but response of volunteer corn to these herbicides has not yet been documented. Therefore, the first objective of this study was to evaluate the response of glufosinate-, glyphosate-, and imidazolinone-resistant volunteer corn to 20 pre-emergence (PRE) and 17 post-emergence (POST) soybean herbicides. The results indicated that PRE soybean herbicides partially controlled (< 80%) volunteer corn except clomazone, while acetyl CoA carboxylase (ACCase) inhibiting herbicides provided ≥ 85% control. Germination and emergence are critical stages in weed seed establishment and persistence. Scientific literature is not available about the factors affecting germination and emergence of volunteer corn. The second objective was to determine the effects of different environmental and agronomic factors on the germination and emergence of glyphosate-resistant hybrid and volunteer corn. The results indicated that response of hybrid and volunteer corn to majority of the variables tested was similar, suggesting that volunteer corn can germinate and emerge in a wide range of climatic conditions. Majority of growers control volunteer corn when it is visible above the soybean canopy, but this can results in early season competition with soybean. The third objective was to evaluate the impact of different densities of glyphosate-resistant volunteer corn at different control timings, and late season volunteer corn emergence on soybean yields. Late season volunteer corn emergence had no significant effect on soybean yield. Yield did not decrease with all volunteer corn densities, except with the highest density (10,000 plants and 500 clumps ha-1) at all control timings. Soybean growers are looking for alternative herbicides, such …
Effects Of Culture Media And Plant Growth Regulators On Micropropagation Of Willow (Salix Matsudana ‘Golden Spiral’) And Hazelnut (Corylus Colurna ‘Te Terra Red), Dongxue Shi
Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research
The branches and leaves of Salix matsudana ‘Golden Spiral’ , willow, grow in a twisted manner, which makes it an important bonsai plant. Its mature stems have potential for the woody cut floral industry. Corylus colurna ‘ Te Terra Red’, hazelnut, distinguished by red or purple leaves in the spring, has potential ornamental value in the horticulture industry for landscape use. Micropropagation of these two plants could provide more and healthier plantlets for rapid commercial scale-up by the nursery industry. Nas and Read Medium (NRM) is a newer medium developed specifically for hazelnut species by Nas and Read based on …
Functional Genomics Of Maize Endosperm Maturation And Protein Quality, Lingling Yuan
Functional Genomics Of Maize Endosperm Maturation And Protein Quality, Lingling Yuan
Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research
Maize is one of the most important cereal crops and widely cultivated throughout the world. The study on maize kernel development including protein quality improvement is essential for removing dietary protein deficiency because of the lack of essential amino acids, especially lysine and tryptophan, in maize kernel. Quality Protein Maize (QPM) is a hard kernel variant of the high-lysine mutant, opaque-2. We created opaque QPM variants to identify opaque-2 modifier genes and to investigate deletion mutagenesis combined with Illumina sequencing as a maize functional genomics tool. A K0326Y-QPM deletion mutant, line 107, was null for the 27- and 50-kD …
Delay Of Bud Break On 'Edelweiss' Grapevines With Multiple Applications Of Amigo Oil And Naa, Benjamin A. Loseke
Delay Of Bud Break On 'Edelweiss' Grapevines With Multiple Applications Of Amigo Oil And Naa, Benjamin A. Loseke
Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research
‘Edelweiss’ is an important grape cultivar grown in the Midwestern part of the USA. This grapevine is tolerant to extreme winter temperatures which can be experienced in the areas where it is most widely grown. ‘Edelweiss’ is one of the earliest cultivars in the vineyard to break bud, making it very susceptible to late spring freezes. The primary buds of ‘Edelweiss’ produce a significant amount of fruit, while unlike many other hybrids, the secondary and tertiary buds will have little to no yields, thus making it important to protect the primary buds from a late freeze. The objective of this …