Abstract
<em>The content of nitrogen and potassium in vermicompost generally low, i.e. less than two percent, so that still require the addition of another source to meet crop requirement.� Potassium nitrate to form the ions K<sup>+</sup> and NO<sub>3</sub><sup>?</sup>� after disolved in water so as to be readily available to plants.� The study aims to determine the effect of the addition of potassium nitrate in vermicompost me</em>dium to the concentration of nutrients in the shoot of lettuce.� Research conducted in the form of pot experiment.� The treatment consists of 12 levels of concentration or nutrient solution electrical conductivity with the addition of potassium nitrate.� The results of experiment indicated that the concentrations of P and K in plant shoot tissue were significantly increased linearly with the provision of KNO<sub>3</sub>.� The concentration N, Ca, Mg, S, Na, Fe, Mn, Cu, Zn, Al and B in shoot tissue of plants is not affected KNO<sub>3</sub>.
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