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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Influence of cover crop management on Armyworm, Pseudaletia Unipuncta (Haworth) seasonal abundance, natural enemies, and yield in no-till corn, and diurnal abundance and spatial distribution of Armyworm /

Laub, Curtis A., January 1990 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1990. / Vita. Abstract. Includes bibliographical references (leaves 73-77). Also available via the Internet.
2

Effectively utilizing legume cover crops as an organic source of nitrogen in concord grape

Bair, Kyle Edward, January 2006 (has links) (PDF)
Thesis (Master of soil science)--Washington State University, December 2006. / Includes bibliographical references.
3

Influence of cover crops on vine performance at two Willamette Valley vineyards /

Sweet, Rebecca Marie. January 1900 (has links)
Thesis (M.S.)--Oregon State University, 2007. / Printout. Includes bibliographical references (leaves 68-74). Also available on the World Wide Web.
4

Characterization of disease reduction by cover crops in a no-till pumpkin production system

Collins, Alyssa A.. January 2006 (has links)
Thesis (Ph.D.)--University of Delaware, 2006. / Principal faculty advisor: Kathryne L. Everts and Jeffrey J. Fuhrmann, Dept. of Plant and Soil Science. Includes bibliographical references.
5

Influence of Winter Annual Cover Crops and Insect Management Strategies on Insect Pests of Mississippi Soybean

Whalen, Daniel Adam 14 December 2018 (has links)
An increasing cultural practice in soybean, Glycine max (L.), production is the use of winter annual cover crops before planting. Species of grasses, legumes, and forbs are planted for many agronomic purposes during the fall months. In the spring, cover crops are killed and soybean planted into the residue. When the termination of the cover crops is delayed for longer lasting benefits, insect pest issues can arise. The movement of insect pests from cover crops to subsequent cash crops happens through a connection known as the “Green Bridge”. Pests found in cover crops such as the pea leaf weevil, Sitona lineatus L. (Coleoptera: Curculionidae), can be particularly damaging to immature soybean plants. Experiments were conducted to tests how cover crops influence insect populations in soybean. Also, various chemical control options, soybean planting populations, and the timing of cover crop termination prior to planting were tested in these cover crop-soybean systems. Lastly, an experiment was conducted to measure how various species of cover crops and neonicotinoid seed treatments affect arthropod diversity in soybean fields.
6

Winter cover crops in corn and forage sorghum rotations in the Great Plains

Freeman, Oliver W., II January 1900 (has links)
Doctor of Philosophy / Department of Agronomy / Mary Beth Kirkham / In Kansas, winter cover crops have a new interest with the development of summer crops for biofuel. When a crop is harvested for bioenergy, the residue is removed leaving the soil prone to erosion during the winter. It is possible that the use of winter cover crops may allow for more residue to remain in a field while keeping the soil from blowing. Therefore, the objective of this research was to determine the effect of two winter cover crops on the growth of two biofuel crops, corn (Zea mays L.) and forage sorghum [Sorghum bicolor (L.) Moench] in a corn-forage sorghum rotation. The two cover crops were a legume, Austrian winter pea (Pisum sativum var. arvense Poir.) and winter wheat (Triticum aestivum L.). Control plots were fallowed. The experiment was done for two years (2010 and 2011) at two locations: under rain-fed conditions in Manhattan in the northeastern part of Kansas, where the soil was a Belvue silt loam (coarse-silty, mixed superactive non-acid, mesic Typic Udifluvents) and under irrigated conditions in Tribune in the western part of Kansas, where the soil was a Richfield silt loam (fine, smectitic, mesic Aridic Argiustolls). Two levels of nitrogen were added to the soil: 0 and 101 kg ha[superscript]-1 N. Grain and stover yields of the corn and forage sorghum were determined at harvest of the crops in the fall, and dry matter production of the cover crops was determined at their termination in the springs of 2011 and 2012. Additional nitrogen fertilizer increased grain and stover yields in both growing seasons at both locations, except for Manhattan in 2010. During the second winter of the study, Austrian winter pea did not emerge in Manhattan, probably due to a combination of cold temperatures and drought. Austrian winter pea survived both winters at Tribune. Corn yielded more grain than did the forage sorghum in Manhattan in 2011 and in Tribune in 2011. This suggests that, under both rain-fed and irrigated conditions in Kansas, corn would potentially be more productive for bioenergy production than forage sorghum. The results of the study also showed that winter wheat for both Manhattan, Kansas, and Tribune, Kansas, should be the cover crop chosen, because of its ability to grow well during the off-season of the bioenergy crops and to provide soil cover during winter.
7

Management and assessment of winter cover crop systems for supplying nitrogen to corn in the mid-Atlantic region of the United States /

Vaughan, Jeffrey David, January 1994 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1994. / Vita. Abstract. Includes bibliographical references. Also available via the Internet.
8

Aggregation, bulk density, compaction, and water intake responses to winter cover cropping in Willamette Valley vegetable production /

Buller, Gilbert L. January 1900 (has links)
Thesis (M.S.)--Oregon State University, 1999. / Typescript (photocopy). Includes bibliographical references. Also available online.
9

The evaluation and management of different grasses and legumes as potential cover crops in the vineyards of South Africa /

Fourie, J. C. January 2007 (has links)
Dissertation (PhD(Agric))--University of Stellenbosch, 2007. / Bibliography.
10

Die effek van verskillende oppervlakbewerkingspraktyke op die wortelverspreiding van wingerd /

Brink, Daan January 2007 (has links)
Thesis (MScAgric)--University of Stellenbosch, 2007. / Bibliography. Also available via the Internet.

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