Crop and Soil Science

I work with various techniques to control weeds in dryland wheat production. This work includes seeding rates, seeding patterns, and various in-crop tillage options. Currently I am looking at the effects of green manure on moisture-limited dryland wheat production.

Seed Science and Technology

Seed quality evaluation in relation to the physiology of seed germination, vigor, dormancy, storability, post-harvest technologies, and the relationship to field performance.

To provide vision and leadership for developing a collaborative work model for national and global colleagues within the forage and grassland sciences, wherein we:

Responsibilities include state-wide weed management support for agronomic crops for farmers, OSU Regional Extension Faculty, and the diverse agricultural industry throughout Oregon.

Nutrient cycling in natural and human-disturbed ecosystems, including the attenuation of increased nitrogen inputs to terrestrial ecosystems by soils and vegetation, detrital controls on soil organic matter formation

Stephen Machado leads the OSU's long-term research activities at CBARC Pendleton, CBARC Moro, and in Heppner in eastern Oregon.

Responsible for Extension and Research programming related to cropping systems in Malheur County.

IPM, Biological Control, Insect Ecology, Integrated Pest Management.

My research focuses on Potato Breeding and Germplasm Improvement using traditional, molecular, and genomic tools. My program will aim at developing new potato cultivars with increased biotic and abiotic stress tolerance, nutrient efficiency and processing quality.