Nitrogen Uptake Eficiency And Nitrate Reductase Activity On Elephant And Kolonjono Grasses With Diffferent Composition Of Urea And Organic Fertilizer In Saline Soil

Abstract

Experiment was aimed to investigate the effect of different composition of urea and oranic fertilizer on the nitrogen uptake efficiency (NUE) and nitrate reductase activity (NRA) of Elephant and Kolonjono grasses in saline soil. It was conducted in the aline soil of Jerakah, Semarang City from June to June to September 2005. Analysis was carried out in the Forage Crp Science Laboratory, Faculty of Animal Agriculture, Diponegoro University, Semarang. Elephant and Kolonjono grasses, urea and organic fertilizer, and saline soil were used throughout the experiment. Completely randomized design in series experiment (4 x 2), with 3 replication was used to arrange the experiment. The first factor consists of fertilizer (control/no added fertilizer, T0; added urea 30 kg N ha-1, T1; added urea 60 kg N ha-1, T2; added organic fertilizer equally to 1,21 C-Organic, T3). The second factors were kinds of grasses (Elephant grass, R1; Kolonjono grass, R2). It was resulted that there were significantly differences on the two parameters (NUE and NRA) of Elephant and Kolonjono grasses in the saline soil. The organic fertilizer increased both the NUE and NRA on Elephant and Kolonjono grasses compared to that of urea fertilizer.