Effect of method of phosphorus application on alfalfa grown on a Willamette Valley "Red Hill" soil

Published December 1963. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo

The use of soil and plant analysis in the diagnosis of zinc deficiency in Oregon

Published January 1977. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo

Crop Response to Lime in the Western United States

The western states include a complex combination of geological, topographical, climatic, and vegetative features. The region extends through 1900 km of latitude and contains three major north-south, storm-directing mountain systems. Most of the region is arid (annual precipitation < 50 em); however, sizeable agriculturally important areas west of the Cascade and Sierra Nevada mountains, and at higher elevations along all the major mountain systems, receive substantial annual precipitation (120-200 em). Mean annual temperatures vary from 24°C in the desert areas near our border with Mexico to 3°C in the mountain valleys of the Northwest. This wide range of climates superimposed over a variety of parent materials and landforms has favored the development of many widely differing soils. To this variety of soils and climates, farmers have introduced agricultural systems that include a large number of economically important crops grown under management systems that vary from minimal to the most intensive. As a result, acid soils and soil acidification, although not always extensive, are important in every area of the region

Lime Fertilizer Interactions Affecting Vegetable Crop Production

Experiments at the North Willamette Experiment Station have evaluated response of vegetables to lime and other fertilizers since 1970. The soils are moderately acid (pH 5.4 to 5.6), high in P, and better drained than most soils used for vegetable crop production in western Oregon. Typical soil acidity problems such as Mn toxicity are probably less severe than for many soils with comparable pH values. Therefore, lime responses at this location might be less than would be expected for many Willamette Valley soils.p.109-119 from the 34th Annual Northwest Conference at Portland, Oregon. July 12-14, 1983

Potential for Phosphorus Toxicity in Zinc-Stressed Corn and Potato

Corn (Zea mays L., 'Illinois WF 9x38-11') and potato (Solanum tuberosum L., 'Russet Burbank') were grown in dithizone purified nutrient solutions to contrast relationships between dry matter yield, tissue phosphorus (P) concentration, and tissue zinc (Zn) concentration as they influence the development of Zn deficiency and P toxicity. Treatments consisted of Zn at 0, 0.14, and 0.41 μM in factorial combination with P at 0.02, 0.10, 1.0, and 3.0 mM. Yield and tissue concentration of P and Zn were affected by statistically significant P-Zn treatment interactions in both species. Corn plants developed Zn deficiency symptoms and responded to nutrient solution Zn when plant growth was not limited by inadequate nutrient solution P. Corn plants grown in nutrient solutions containing 0 μM Zn and 3.0 mM P contained 3.39% P in leaf tissue and had significantly lower yields than did plants grown in nutrient solutions containing 1.0 mM P. Even though no visual symptoms were evident, P toxicity probably was responsible for the reduction in yield. Potato plants responded to nutrient solution Zn when growth was not limited by inadequate P but did not exhibit visual symptoms of Zn deficiency. Zinc--deficient potato plants containing in excess of 2.22l% P in leaf tissue exhibited probable P toxicity symptoms characterized by puckering of leaf edges, thickening and upward curling of leaves, and leaf necrosis. Excessive concentration of P in leaf tissue of Zn-deficient potato was the result of increased mobilization and translocation of P from roots to above-ground parts, increased total P uptake, and concentration of P resulting from restricted growth. Excessive levels of P in corn leaf tissue were primarily the result of concentration of P due to restricted growth. Zinc concentration in tissue of both species was reduced by growth response dilution, but Zn uptake by plants receiving low levels of Zn was not reduced by increasing nutrient solution P concentrations. Apparent accentuation of Zn deficiency by P application is explained on the basis of accumulation of toxic levels of P in Zn- deficient plants. Species such as potato which show increased P uptake and increased mobilization and translocation of P to tops when under Zn stress are probably more susceptible to P toxicity

Wheat production practices for Polk and Yamhill Counties, 1981-1982

Published February 1984. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo

Phosphorus and copper fertilization effects on chiefton and danver onions

Proceedings of the Annual Fertilizer Conference of Pacific Northwest - 31stPublished 1980. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo

Spring grains : western Oregon -- west of Cascades [2000]

Revised April 1983. Reprinted January 2000. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo