Fig. 1. Effect of extraction ratio on inorganic water-extractable phosphorus measured colorimetrically without digestion (WEPI) and total water-extractable phosphorus measured colorimetrically with digestion (WEPT) in two dairy manures, either (a and b) with or (c and d) without bedding, as analyzed fresh, air-dried, or oven-dried. Data are averages of single and sequential batch extractions.