Abstract
Rice cultivation using substrate hydroponic system on the building’s rooftop is an alternative way to improve rice production. This research aimed to study the effect of growth media compositions on rice growth with substrate hydroponic system. The experiment used Completely Randomized Block Design with five treatments of growth media composition i.e. 100% rice husk charcoal; 100% cocopeat; 50% rice husk charcoal: 50% cocopeat; 25% rice husk charcoal: 75% cocopeat; and 75% rice husk charcoal: 25% cocopeat. The result showed that composition of 75% rice husk charcoal : 25% cocopeat significantly affected plant height. Otherwise, reformulating nutrient composition for hydroponic rice cultivation supported the growth media to perform better. The addition of NH4 + as a source of nitrogen improved plant growth in vegetative stage. In addition, the ratio between K: Ca (1.25: 1) applied to complete requirement of those nutrients and considered as environmental stress defence. The use of a container becomes an alternative to maintain media relative humidity and nutritional EC value. Either in the rainy or dry season, relative humidity and nutrient EC of media must be checked frequently to maintain the optimum conditions for rice growth.
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