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Filtering by: Academic Affiliation Crop and Soil Science Committee Member Selker, John Language English [eng]

Effects of Initial Moisture and Surface Properties on Sorptivity of Coarse Soil and Sand

Creator:

Ambrowiak, Gloria M.

Abstract:

Many different models and mechanisms of water imbibition into soil have been described in the literature. Theoretical equations based on those models exist to predict how water will flow in porous media. These models can be useful, but have their weaknesses. Research on imbibition and infiltration into soils has mostly...

Resource Type:

Masters Thesis
Nitrate and water under terraced dryland wheat production in Oregon

Creator:

Strock, Jeffrey S.

Abstract:

Dry land agriculture using summer fallow is a common crop production practice in the Columbia Plateau region of eastern Oregon. Farmed-over level terraces are used to control surface water runoff and soil erosion. More than 70 percent of the average annual precipitation around Pendleton, Oregon (350 - 400 mm) falls...

Resource Type:

Masters Thesis
Seedling recruitment of hairy nightshade and other summer annual weeds in irrigated row crops

Creator:

Peachey, Ronald Edward

Abstract:

This study evaluated the effects of tillage system, rotational tillage sequences, and winter seed burial depth on weed seedling recruitment in irrigated cropping systems. Notill (NT) planting of vegetable crops reduced emergence of hairy nightshade by 77 to 99% and Powell amaranth emergence from 50 to 87% compared to conventional...

Resource Type:

Dissertation
N processing in grass seed crops differing in soil drainage and disturbance in western Oregon, U.S.A.

Creator:

Nelson, Machelle A.

Abstract:

A better understanding of grass seed crop and soil fertility is necessary to improve fertilizer practices and preserving water quality in Willamette Valley, Oregon, where 55% of land-use is in grass seed production that directly impacts adjacent waterways containing native protected fish species. I determined tillage effects on soil N...

Resource Type:

Masters Thesis