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- W2186768823 abstract "INTRODUCTION Phosphorous and potassium are important to grow a high yielding and quality potatoes. Much of the northwest has had traditionally high soil test K levels. These soils have historically had greater that 200 ppm K, with many higher than 400, now have less than 100 ppm K. Some of the sandier soils that have been in production for over 20 years have been testing less than 30 ppm K. Potatoes have a high requirement for K and during the growing season petioles can drop to less than 4% K on low testing soils. Work done in the Columbia Basin has shown that seasonal K uptake can be as high as 800 pounds per acre with daily uptake rates of 20 pounds per acre per day in 2000. There has been a wide variety of methods used to supply K to potatoes on some of these low K soils: including large amounts of K applied pre-plant, applications at planting and in-season additions all with limited success in raising petioles to levels considered adequate. Phosphorous has always been a battle in potato production. Work done in Idaho suggests 0.1% PO4 is adequate. The Oregon State University Potato guide recommends minimal P is needed when soil P is greater than 20 ppm. The benefit of in-season phosphorous applications is difficult in potato production. University guidelines tend to be exact, e.g. when soils are greater than 20 ppm P no P is needed or when petioles are will drop below 0.1% apply P. Life is rarely so easy." @default.
- W2186768823 created "2016-06-24" @default.
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- W2186768823 date "2005-01-01" @default.
- W2186768823 modified "2023-09-27" @default.
- W2186768823 title "P AND K IN POTATOES" @default.
- W2186768823 hasPublicationYear "2005" @default.
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