Abstract

High dose application of inorganic fertilizer in agriculture creats several problems, such as high cost production, reduce farmers income and solid fertility, and harm our environment. Therefore, it is needed to understand a fertilizer which is cheap, abundant raw material and adaptive to environment. Many author reported that macroalga could be used as raw materials for developing organic fertilizer as it contains phytohormones and essential alements stimulating growth and production of plants. This article reports the effect of anorganic fertilizers and brown alga solid extract on growth and yield of rice plants. The experiments consisted of two factors, dose of anorganic fertilizer (0,25,50, and 100%), and brown alga solid extract (P0 and P1). Since there was eight combinations, and each combination was repeated three times, then the experiment consisted of 24 experimental pot. The results shown application of 25% anorganic fertilizer in combination with solid axtract increased growth and yield of rice plants on the similar value when the rice plants supplied with 50% or 100% dose of anorganic fertilizer. This suggests that the application of 25% anorganic fertilizer in combination with solid extract could increase efficiency in using organic fertilizer into 75%.

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