When magnesium is needed and lime is required, the use of dolomitic limestone is recommended. Liming Missouri Soils . The organic matter soil test is used to estimate potential nitrogen release to a crop throughout the growing season. The test also provides a basis for determining proper herbicide rates. There is no rating system for organic matter because it is relatively stable under normal cropping and fertility practices and cannot be easily changed.
Neutralizable acidity is a measure of the exchangeable hydrogen within soil.
To calculate nitrogen needs, the yield goal should be realistic, based on crop yield history of the field, irrigation, and your own managerial skills. Add to that the nitrogen needed to grow the vegetative portion of the crop. Nitrogen rate adjustments 1 . Based on soil texture, organic matter and time of major growth. In this example, the final corn population was expected to be 20,000 plants per acre.