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The relationship between medium nutrient levels extracted with the pour-through (PT) and the saturated medium extract (SME) procedures was investigated. These procedures were used as indicators of plant nutrient uptake and growth of poinsettia, Euphorbia pulcherrima Wind. ex. Klotzch. The medium nutrient levels and electrical conductivity associated with optimal plant growth were about two times greater for PT than for SME. The pH values were similar for both procedures. Regression analysis of the relationship between applied and extracted nutrient levels gave higher R 2 values for the SME, although the relationship for PT was acceptable. Both procedures provided an acceptable and similar correlation between the level of NO 3 -N extracted and the level of N absorbed by the plants. The results demonstrate the utility of both PT and SME as indicators of the nutritional status of a greenhouse medium.
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Wright et al. (1990) studied this question.
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