<![CDATA[In recent years, the main problem in agriculture practices is how to increase the efficiency of K fertilization toachieve high productivity, in both quantity and quality. Potassium fertilizer applied is not completely absorbed by plantduo to nutrient loss from root zone and converting to unavailable form. Beside that, soybean requirement in Indonesiaevery year always mount along with accretion of resident. To fulfill the requirement have to be imported becausedomestic product not yet earned to answer the demand the requirement. Therefore these problems, coupled with increasinguse of K fertilizer and the fact that fertilizer of K are expensive, point to the need that the fertilizer is more and moreimportant. To overcome these problems, efforts need to be corrected to increasing the efficiency of nutrient uptake,especially uptake K nutrient by soybean plant from application of K fertilizer and increasing yield efficiency of seedsoybean for every unit of K fertilizer applied. One of the means to achieve these is used of lines soybeans as will newvarieties, which have superiority of character, and efficiency in K fertilizer uptake. This research aims to know how biguse efficiency fertilizer of potassium at some soybean lines and to see the response of some soybean lines to gift ofpotassium. This research has been executed in Research Site of the Faculty of Agriculture, University of Riau. TheResearch is executed during four months, started from April until July 2010. Desain used by the Randomized Blok Design(RAK) with two factors. The first factor is the genotype of soybean, i.e.: line 11 AB, line 13 ED, line 14 DD, line 19 BE,and line 25 EC. The second factor is the rate of potassium fertilizer, i.e.: without potassium, 50 kg KCl/ha, 100 kg KCl/ha. Hence, there were 15 treatment combinations, each with three replications.The results showed that the effect of Kfertilizer was not significant on parameter of absorption of potassium, efficiency of potassium absorption, produce seedsper plot and efficiency of seed produced. Among the five genotypes, line 14 DD shows responsifity to application ofpotassium fertilizer at rate 50 kg KCl/ha and also 100 kg KCl/ha, was indicated by positive value on parameterefficiency of seed produced, efficiency of potassium absorption and production of seed per plot. Where as the others linesof soybean indicated negative value on the efficiency of potassium absorption and the efficiency of seed production,meant the application of K fertilizer 50 kg KCl/ha and 100 kg KCl/ha were lower production than without K fertilizerapplication. In general, K fertilizer application on the soil which have moderately low K (0,35 cmol(+)/kg) were notefficient to increase seed production of soybeans, except on lines 13 ED and 14 DD were efficiency if giving 50 kg KCl/ha.Keywords: efficiency, potassium fertilizer, soybean]]>
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