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Highlighting agricultural developments, problems, research, & issues for central coast CA
by Viseth KONG
on January 9, 2013 at 7:24 PM
It is good that fix to what I need to search about my field problem. Could someone help to explain me more clear that it can be cause by fertilizer (10-5-0). or cause by not do crop rotation. I am looking forward for any help
by Richard Smith
on January 11, 2013 at 11:11 AM
Viseth: Ammonium toxicity on lettuce is causes by a temporary increase in ammonium levels in the immediate vicinity of the lettuce roots. During much of the growing season ammonium levels in the soil are rarely greater than 2.0 ppm; however, in the cooler times of the year (e.g. January - March) ammonium levels can increase to 8-10 or more ppm because the normal nitrification process that converts ammonium to nitrate slows down due to cold soil temperatures. Under these conditions ammonium toxicity can occur. Fertilizers that contain urea or ammonium can build up ammonium levels. The rate of fertilizer application also affects the levels of ammonium found in the soil. In addition, the placement of the fertilizer can be a factor.
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