Abstract
Abstract In one technique, water transpired by the crop is replenished with a dilute nutrient solution supplied through a nylon wick. Nutrients are supplied on demand, avoiding infrequent heavy applications, and soil air and moisture tension remain constant. In the second, test plant roots grow through a soil sample into a nutrient solution beneath. Nutrients can be applied through either the soil or the solution, and the sites of nutrient interactions identified. Both techniques are economical in materials, space, and operator time.
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