Abstract
Fluctuations in rice production due to conversion of paddy field to other various land use defected the rice production in Indonesia, and in turn it may endanger the food security. Efforts to utilize hydroponics as a technology of vegetable production in limited land availability has developed. However, the practice of hydroponics in rice plants is still limited due to the availability of special nutrient. This study aims to determine the benefits of silicate rice husk extract on the growth of rice hydroponics. The research design used was complete randomized block design. The observed growth parameters are : plant height, electrical conductivity of nutrients and pH. The observed data were analyzed using variance analysis. If the results of variance analysis are significant, the analysis will be proceed with Duncan multiple range test. The results showed that application of rice husk silica extract of 20 ml/L through leaves gave the same response with sodium silicate (Na2O3Si) application through nutrient solution, but had significant effect on the change of electrical conductivity value and pH of nutrient solution. The results showed that silicates derived from organic materials can replace the role of silicates derived from inorganic materials on paddy hydroponic.
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