Processed Vegetable Production

Enhanced efficiency fertilizer technologies for improved production in sweet corn (2014)

Enhanced efficiency fertilizer (EEF) technologies have the potential to improve the crop N use efficiency (NUE) as well as minimize negative environmental losses compared to conventional fertilizers. The EEF fertilizer products consist of urea plus additives (to inhibit N loss). The major pathways for N loss in our sweet corn cropping systems are 1) N leached below the root zone as water soluble nitrate-N (NO3-N), and 2) gaseous ammonia loss (NH3-N) to the atmosphere following a surface urea application.Field studies and a laboratory incubation study were conducted in 2014 to evaluate the potential for benefit from EEF products via reduced nitrate-N leaching. Three products were evaluated: ESN (polymer coated urea), SuperU (prilled urea containing both a urease and nitrification inhibitor), and Instinct (urea + nitrification inhibitor).

Increasing the Nutrient Use Efficiency of Snap Beans (2014)

The overall objective of this multi-year project is to maximize nutrient use efficiency without compromising bean yield and quality. This year’s project objectives were to: 1) evaluate crop response to P fertilizer at current soil P test levels in grower fields; 2) generate phosphorus (P) potassium (K), and nitrogen (N) nutrient budgets (fertilizer inputs vs. harvest removal); and 3) evaluate relationships among bean root rot disease, plant P uptake, biomass allocation (pods vs. leaves).

Using the Pre-Sidedressing Soil Nitrate (PSNT) ‘Quick Test’ to Guide N Fertilizer Management in Sweet Corn (2013)

The following is a method for cheaply and quickly determining a soil’s nitrate status for the purpose of determining the midseason sidedress fertilizer rate for sweet corn. For information on the pre-sidedress nitrate test (PSNT), see OSU’s nutrient management guide EM 9010-E (Sweet Corn- Western Oregon). The ‘Quick Test’ (QT) has been in use for years in the Salinas Valley of California with good results. Compared to a traditional laboratory test, it is cheaper and test results can be obtained within hours of sample collection. Although this method is semi-quantitative, results from the QT are well correlated with laboratory results.

Phosphorus fertilization of snap beans for processing: revisiting current recommendations (2013)

Current snap bean phosphorus (P) fertilizer recommendations for Oregon are higher than those given in other extension publications across the US. Despite the scale and importance of snap bean production in Oregon, little attention has been paid to the phosphorus (P) utilization of this crop over the past 30 years in the Willamette Valley.Due to changes in production practices, the increase in the price of P fertilizers, trends towards greater sustainability, and soil test P (STP) values commonly greater than 50 ppm Bray (the level at which a crop response to P fertilizer is unlikely), there is interest in revisiting the current recommendations to better balance P inputs/outputs.