Comparison of Pour-through and Saturated Pine Bark Extract N, P, K, and pH Levels1

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Abstract
The pour-through (PT) method of nutrient extraction, which involves pouring water on the container media surface and collecting the extract (leachate), was compared to the saturated soil extract (SSE) method for a 100% pine bark medium at container capacity (102% gravimetric moisture). The SSE and PT correlation coefficients, respectively, were 0.99 and 0.94 for N, 0.99 and 0.97 for P, 0.99 and 0.93 for K, and 0.99 and 0.98 for pH. As container media moisture levels increased from 50 to 102%, the PT and SSE soluble salt levels increased 1.5 and 1.6 times, respectively, while nitrate levels increased 1.7 and 1.6 times, respectively. The volume of water applied for the PT was varied from 40 to 100 ml and did not result in extraction of different levels of N, P, K, Ca, or Mg. These data indicate the PT is an alternative to the SSE for nutrient extraction from a pine bark medium.

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