Changes in the Content of Fixed Ammonium in Gray Forest Soil Depending on Potassium Balance and Crop Species
It was shown in long-term stationary experiments that a strong potassium deficit in agrocenoses appreciably decreased the content of nonexchangeable ammonium in the arable soil layer, and the simultaneous application of nitrogen fertilizers favored the downward migration of mineral nitrogen and the accumulation of fixed ammonium in the lower part of soil profile. When the potassium balance was positive, nonexchangeable ammonium was deposited in both arable and lower soil horizons.