Abstract
ABSTRACT Plant growth is related to media pH and nutrient components. For this study, we developed the use of silicate minerals, which buffer pH, and a nutri-culture system using quartz porphyry (QP). Nutrient solutions were allowed to pass from the lower to the upper side of the packing layer by pumping into the system. The pH of the nutrient solution not using QP changed rapidly with the addition of pH buffer. However, the nutrient pH using QP without addition of buffer remained stable at 5.6–6.1. The variation in solution pH appeared to be related to the disruption in nutrient components affected by QP, which released calcium (Ca2+), magnesium (Mg2+), and potassium (K+). With cultivation of komatsuna (Brassica rapa L. nothovar) in the Nutrient film technique system, the fresh weight of leaves and roots and the length of plants were significantly higher in treatments compared to control. Therefore, this nutrient system has potential applications in hydroponics.
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