Monitoring Soil Nitrate to Estimate Cover Crop Nitrogen Contribution in Organic Vegetable Production Fields

Authors: Nick Andrews, Dan M. Sullivan, and Kristin Pool, Oregon State University

View the full document here.

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: solo common vetch (V),¬† phacelia + V (PV), and cereal rye + V (RV), plus a winter fallow (F) control in grower fields in the north Willamette Valley OR. Soil textures were … Read the rest

Soil Nitrate Testing for Willamette Valley Vegetable Production (2019) EM9221

Link: https://catalog.extension.oregonstate.edu/em9221

This publication describes how to use in-season soil nitrate testing to adjust sidedress N fertilizer application rate to match crop N requirements. Data to support our recommendations comes from field trials conducted in the Willamette Valley for vegetable crops produced during summer months.… Read the rest