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<blockquote data-quote="Dave" data-source="post: 1538348" data-attributes="member: 498"><p>Trying to remember what the numbers were. It has been about 15 years since I dealt with this. I am pretty sure that the soil K was over 2,000 ppm. On a dairy I worked with the late father had fertilized with 10-20-20 and for years during the winter the close field had got all the manure during the winter. They had also imported alfalfa to the farm which is generally high in K. That combination put the K in the soil through the roof. Good old K stays put until the plants take it up. K, Ca, and Mg are all cations. The plant can't tell them apart from each other so if one is present in abundance and there is a shortage of another the plant will luxury consume the abundant one. If it is too much K the resulting shortage of Ca or Mg can cause milk fever or grass tetany or other issues. I don't remember the K number in the feed I do remember the university experts saying one little notch higher and cows would start dropping like flies.</p><p>I remember another case where a dairy bought 5 cows from out of the area. Paid through the nose for those cows. Brought them home and put them on their home grown feed which was very high on K. They lost all 5 of those cows. That was the first case of extreme high K that I worked on. Got to be over 20 years ago so I don't remember any other details.</p></blockquote><p></p>
[QUOTE="Dave, post: 1538348, member: 498"] Trying to remember what the numbers were. It has been about 15 years since I dealt with this. I am pretty sure that the soil K was over 2,000 ppm. On a dairy I worked with the late father had fertilized with 10-20-20 and for years during the winter the close field had got all the manure during the winter. They had also imported alfalfa to the farm which is generally high in K. That combination put the K in the soil through the roof. Good old K stays put until the plants take it up. K, Ca, and Mg are all cations. The plant can't tell them apart from each other so if one is present in abundance and there is a shortage of another the plant will luxury consume the abundant one. If it is too much K the resulting shortage of Ca or Mg can cause milk fever or grass tetany or other issues. I don't remember the K number in the feed I do remember the university experts saying one little notch higher and cows would start dropping like flies. I remember another case where a dairy bought 5 cows from out of the area. Paid through the nose for those cows. Brought them home and put them on their home grown feed which was very high on K. They lost all 5 of those cows. That was the first case of extreme high K that I worked on. Got to be over 20 years ago so I don't remember any other details. [/QUOTE]
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