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Filtering by: Date issued sim 1972-05-08 Degree Field Soil Science Language English [eng]

Distribution, form, and signigicance of plant opal in Oregon soils

Creator:

Norgren, Joel A.

Abstract:

This study was undertaken to increase knowledge of opal phytoliths in plants and soils of Oregon, and thus encourage further use of phytoliths in future pedologic investigations. Content of plant opal in needles from ten common Oregon conifer species ranged from 0.2 to 7.9%. Western larch (Larix occidentalis) contained the...

Resource Type:

Dissertation
Potato yield and grade as influenced by nitrogen fertilizer and irrigation frequency

Creator:

Jacks, Clinton Cecil

Abstract:

The effects of irrigation frequencies and rates and time of nitrogen fertilizer application on the yields, grades and N status of Russet Burbank potatoes were determined on a sandy soil near Hermiston, Oregon. Increasing the frequency of irrigation from 72 to 48 to 12-hours did not result in increases of...

Resource Type:

Masters Thesis