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Monitoring soil nitrate to estimate cover crop nitrogen contribution in organic vegetable production fields

Creator:

Andrews, Nicholas, Sullivan, Dan M., and Pool, Kristin

Abstract:

Organic vegetable growers rely on legume cover crops as an economical source of plant-available N. This research evaluated N contributions to summer vegetable crops by cover crops (CC) residues by monitoring soil nitrate (NO3-N) concentrations during the summer crop growing season. Replicated field plots were established with three CC mixes:...

Resource Type:

Conference Proceeding

Full Text:

growers rely on legume cover crops as an economical source of plant-available N. This research evaluated
Measuring ammonia loss using field-scale and laboratory techniques

Creator:

Heinrich, Aaron and Sullivan, Dan M.

Abstract:

Following the surface application of urea to soil, there is the potential for nitrogen (N) loss from ammonia (NH3) volatilization until sufficient rain or irrigation has moved it into the soil. Many studies measuring NH3 loss have used laboratory and microplot field studies. The limitation of these techniques is that...

Resource Type:

Conference Proceeding

Full Text:

-28) Site 2 6.3 (5.9-6.9) NA 22 (16-29) 19 (10-32) 30 (27-34) Site 3 5.7 (5.5-5.8) NA 22 (20-24) 28