Increased agricultural production can be achieved through appropriate technology approach, among others, by applying a balanced fertilizer technology specific location. Currently, the recommended fertilization technology is hardly practiced by most of Indonesian farmers, causing fertilization becomes unbalanced. The low knowledge of the importance of garden soil fertility data and carrying capacity of the plant nutrients for growth and production is characterized by low levels of productivity compared to crop genetics.

In support of balanced fertilization method can be performed using several types of single nutrients that are mixed in a simple ( simple blending) , or mixed mechanically ( mechanical blending) or by chemically mixing technology ( chemical blending) called compound fertilizer with nutrient composition or certain formula. While site-specific fertilization is approached by reading secondary data map of soil fertility in a region followed by listening to customer information will condition the garden. Information about the condition of crops farmers can also visually provide basic data for calculation of nutrient composition for preparing a fertilizer that will be manufactured at the factory.

Gramafix® Karet ( Rubber Trees Fertilizer) as compound fertilizer formulating special for rubber trees plant. Its contain complete essential ingredient such as macro nutrient ( N, P, K) , secondary nutrient ( Mg, S, Ca) and micro essential nutrient ( Zn, B, Bo, Cl, Mn, Fe) with composition 19-10-15-3-4-2 + micro element. The formula registered at Ministry of Agriculture Department Republik of Indonesia Number : T905/ BSP/ II/ 2003.

Complete nutrient essential, which as tablet former on 10 grams make rubber tree planting need as same as 35 % than single fertilizer totally amount as usually farmer using like Urea, SP and Potassium and Potash. For example, 1 ( one) ha use 200 kg/ ha/ year only. Gramafix® Karet ( Rubber Compound Fertilizer Specific ) could increase efficiency and furthermore grows up farmer or estate income.