Vegetable production

Introduction

The rationale for this trial was similar to that of the previously described broccoli and sweet corn experiments. Sweet corn is planted at smaller populations and wider row spacings than is broccoli and may be less effective at taking up applied N. The purpose of this trial was to determine if yield of sweet corn would be affected by placement or source of N fertilizer at several rates of applied N.

Methods

Research report from OSU's North Willamette Agricultural Research and Extension Center

Delbert Hemphill
OSU Dept of Horticulture, NWREC

Introduction

Introduction

Introduction

Muskmelon production in the Willamette Valley is usually limited by cool springs, a short growing season, and relatively cool nights, even during mid-summer. Cultural techniques to increase air and soil temperature around plants, such as black plastic mulch and row covers, have hastened development and increased yield of muskmelon in the valley.

Introduction

Introduction

Introduction

This grower trial was undertaken to determine whether residual nitrate and ammonium levels in grower fields were similar to those found in our experiments at NWREC. The data should be useful in indicating which of the major processed vegetable crops leave significant quantities of residual mineral N in the soil at harvest and the extent to which grower cultural practices, particularly fertilizer application, influence the amount of residual N that is available for leaching by heavy winter rainfall.

Methods

Introduction

Introduction

The justification for this trial is similar to that for cauliflower, reported earlier. A sweet corn trial in 1992 indicated that source and placement of nitrogen fertilizer had little effect on yield or quality of sweet corn. Rates of nitrogen application greater than 60 pounds per acre resulted in accumulation of significant amounts of nitrate-N in the soil. The purpose of these trials was to confirm 1992 results and to determine if yield of sweet corn would be affected by source or timing of application of nitrogen fertilizer.

Methods

Introduction