Plant Mineral Nutrient Deficiency: A Hydroponic Alternative Utilizing Nutrient Flow Techniques

 

Tested Studies in Laboratory Teaching, 2013, Volume 34

Kevin Johnson

Abstract

The purpose of this lab experiment is to show the nutrient deficiencies in eight-week old tomato or lettuce plants. Results of the experiment include design methodologies, plant mineral deficiency results, possible errors in nutrient flow technique (NFT) performance, and costs involved. Controlling the growth factors of plants is difficult in a lab setting with students. The variability in the growing medium is limited based on the size of the lab, available equipment, number of students, and budget availability. Using soil to show macronutrient deficiency is almost impossible so the use of hydroponic systems is the most suitable alternative. The (NFT) yields the appropriate nutrient deficiency results in a short turnaround period. With particular design implications, an appropriate hydroponic NFT system can be used to display the teaching prospective of plant mineral deficiency. NFT uses a solubilized nutrient solution which is pumped into a gradient flow reservoir containing exposed roots. The solution is recycled back into the storage container creating a closed loop cycle. The particular macronutrients important to plant growth that are tested include nitrogen, potassium, and phosphorus. The hydroponic systems used in this experiment were specifically designed and built for this laboratory experiment and with student interest in mind. The designs are not only useful in display of mineral deficiency but also present an attractive visual appeal.

Keywords:  plant physiology, hydroponics, mineral nutrient deficiency

University of North Carolina, Chapel Hill (2012)