soils

Potassium availability declines rapidly in calcareous soil

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South Florida sports field soils are generally calcareous, sand, have high (> 7.0) pH, and have insufficient potassium (K). For such soils the medium sufficiency range for turfgrass is reported as 75-175 ppm K by ammonium acetate extraction, which is

Measuring organic matter: Weight or volume?

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Organic matter is the most valuable part, by weight, of soil. But organic sources in soil mixes are specified by volume which is mostly air. What is the price of the air part? What made me wonder was an 80:20