P and K are stable nutrients that stay in place from year to year, so they built up in the soil if they are not consumed by crops. P and K and can be maintained over the long term bases on crop yields.
Nitrogen is more volatile and must be managed to only supply short term crop needs. Nitrogen can be lost even if it is not consumed by crops. Nitorgen level need to be tested more often and in more locations than P and K level.
There is a soil nitrogen cycle or N-cycle. Organic matter and nitrogen fertilizers applied in Ammonium forms (NH4+) are stable and stay in place in the soil. Soil micro-organizms break down Ammoniums (NH4+) into Nitrite (NO2) and then into Nitrate (NO3) that plant roots can take up. Nitate (NO3)is water soluable and will leach down below the root zone. Soil micro-organizms also continue to break down Nitate (No3) into Nitrogen gas (N2) that evaporates into the air. High soil temperatures, and water saturated soil depleat nitrogen levels more quickly regardless of crop yeilds. So... nitrogen levels must be managed to only supply short term crop needs before it is lost.
Others know more about this than I do and can explain it better than I can.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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