Pertumbuhan dan Efisiensi Penggunaan Nitrogen pada Padi (Oryza sativa L.) Dengan Pemberian Pupuk Urea yang Berbeda

Abstract

Nitrogen fertilizer as urea has become a staple for farmers, especially in Indonesia. Consequently, applying such large quantities of urea cannot be avoided. The understanding of nutrient-use efficiency on paddy-field is needed to increase plant productivity and reduce environmental pollution due to the utilization of luxury urea fertilizer. The objective of this research was to quantify the nitrogen-use efficiency (NUE) on paddy-field in different urea application. This study was conducted in field and green house. The experiments were carried out in the experimental field at the Indonesian Center for Rice Research (ICRR), Subang-West Java and farmer’s field at Bogor–West Java. The N fertilizer applied in ICRR and farmer field were 225 and 612.25 kg urea/ha, respectively. Experimental plots were about 25 m2. The N fertilizer applied in the green house experiment were 200, 300, 400, 500 and 600 kg urea/ha, respectively. The result showed that the NUE and N resorption were higher in ICRR than that of in farmer’s field. The green house experiment showed that the NUE and N resorption were higher under 500 kg urea/ha than other treatments. The plant growth, plant biomass, grain yield, NUET, NUEES, ANUE, PNUE dan N resorption were declined with the high availability in nitrogen-pool and increasing in large quantities at certain doses of N fertilizer.