Anticrustants on Seedling Emergence of Carrot and Lettuce (1986)
Research report from OSU's North Willamette Agricultural Research and Extension Center
Delbert Hemphill
OSU Dept of Horticulture, NWREC
Introduction
Vegetable production
Cultural Practices on Yield and Head Rot of Broccoli (1987)
Research report from OSU's North Willamette Agricultural Research and Extension Center
Delbert Hemphill
OSU Dept of Horticulture, NWREC
Mary Powelson
OSU Dept of Botany and Plant Pathology
Introduction
The objective of this project was to evaluate the effect of plant spacing and nitrogen rate on yield and disease incidence in broccoli.
Methods
Response of Tomato and Lettuce on Straw Bales to a Plastic Cover (1986)
Response of Tomato, Broccoli, and Muskmelon to a Polypropylene Row Tunnel (1986)
Introduction
The purpose of this trial was to investigate the effect of Kimberly Farms row cover on the yield and earliness of broccoli, muskmelon, and tomato.
Methods
Floating Row Covers Reduce Virus Transmission to Potato Seed Stock (1986)
Control of virus-vectoring insects, particularly aphids, is essential in production of potatoes for seed to exclude viruses such as potato virus Y, leaf roll, and net necrosis. Seed production fields are heavily treated with insecticides to prevent virus transmission, but control is often inadequate. Floating row covers may protect plants from attack by insect vectors, reducing the need for insecticides. Row covers might also increase yield through their effect on air and soil temperatures around the plants.
Response of Cucumber to Floating Row Covers and Herbicides (1986)
Crop protection with floating row covers interferes with tillage or other means of weed control. Therefore, herbicides or ground mulch are the likely means of weed control under covers. A successful weed control program depends on understanding the environmental and physiological interactions between the herbicide and other components of the cropping system. Results in 1983 with bunching onions (N. S. Mansour) indicated that paraquat residues on row covers might injure the subsequently emerging crop.
Weed Control in Overwintered Onions (1986)
Research report from OSU's North Willamette Agricultural Research and Extension Center
Delbert Hemphill and Bob Mcreynolds
OSU Dept of Horticulture, NWREC
Lime and Gypsum Effects on Spring-Planted Onions (1986)
Fertilizer trials with overwintered onions at the North Willamette Station indicated a strong yield increase with application of lime, an increase with gypsum (calcium sulfate), and higher yields with ammonium sulfate rather than other N sources. The yield response to gypsum and ammonium sulfate indicated that when soil pH, N, P, and K are optimal, S may be the limiting element in onion production.
Lime and Fertilizer Effects on Overwintered Onions (1986)
Overwintered onions in the Willamette Valley are seeded in early September for harvest the following spring. Strong growth in the spring is essential for producing high value jumbo bulbs. However, air and soil temperatures in the spring are less than optimal, possibly limiting response to fertilizers.
Nitrogen Rates and Phosphorus on Onions (1986)
Storage onions in western Oregon have been grown almost exclusively on lake bottom soils which are high in organic matter (more than 10%). Recently, production of onions on mineral or "upland" soils with low organic content and N availability has increased rapidly and now equals production on the organic soils. Response of onions to nitrogen rate and to applications of phosphorus and potassium on the mineral soils is not well understood.