The reason for the lower credit with a fall harvest is due to the limited amount of legume regrowth that would occur prior to a killing frost. Forage legume nitrogen credits. Textured Soils Sandy Soils Regrowth after last cut Regrowth after last cut more than 8 in. The method for assessing N credits following soybeans has been modified based on research findings. Research has shown the N credit following low-yielding soybeans to be higher than previously thought.
Research continues to investigate other parameters for assessing soybean N credits.
As a result of the new estimates of soil buffering capacity, the P and K fertilizer recommendations for corn, alfalfa, and soybeans at soil test values of very low and low have been revised to allow for a more rapid build-up of soil fertility levels. Table 3 shows these changes. Soil buffer capacity values for phosphorus and potassium. 2 Use lower values on sandy or organic soils. 4 Use the loser values on sandy or organic soils.