摘要：The mains of this research were to study the effect ofshade and nitrogen fertilizer variation and also their interaction to nitrogen content,nitrate reductase activity, and biomass of kimpul (Xanthosoma sagittifolium (L.)Schott.). This research was arranged in randomized complete block design (RCBD)with two factor, they were shade variation which contained 3 levels (0%, 50%, and75% of shade) and nitrogen fertilizer dosage variation which contained 4 levels (0;0.0625; 0.125; dan 0.25 g ZA/kg of soil of the dosage of ZA fertilizer). The variables ofthe research were nitrogen content, nitrate reductase activity, fresh weight, dryweight, and shoot/root ratio. The collected data were analyzed with General LinearModel Univariate, and continued with Duncan’s Multiple Range Test (DMRT) on 5%significantly levels. The result showed that the shade treatment affected nitrogencontent, fresh weight and shoot/root ratio. The fertilizer application and theinteraction between shade and fertilizer application was affected to all variabels. Thetreatment of 75% shade and 0.25 g ZA/kg of soil of ZA fertilizer dosage increasednitrogen content (5.32%) and fresh weight (420.88 g). The treatment without shadeand 0.25 g ZA/kg of soil, dosage of ZA fertilizer increased nitrate reductase activity(260.58 μ mol NO2-/g/hour) and dry weight (53.92 g). The treatment of 50% shade and0 g ZA/kg of soil of ZA fertilizer dosage increased shoot/root ratio (0.98).
