The Efisiensi Penggunaan Nitrogen pada Padi Gogo Varietas IPB 9G

Suwarto; Defiyanto Djami Adi; Iskandar Lubis; Sugiyanta

doi:10.24831/jai.v49i1.33626

Suwarto Departemen Agronomi dan HortikulturaFaperta-IPB
Defiyanto Djami Adi Akademi Komunitas Negeri Sabu Raijua Jl. Trans Seba, Sabu Barat, Sabu Raijua, Nusa Tenggara Timur, Indonesia
Iskandar Lubis Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor (IPB University), Jl. Meranti, Kampus IPB Darmaga, Bogor 16680, Indonesia
Sugiyanta Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor (IPB University), Jl. Meranti, Kampus IPB Darmaga, Bogor 16680, Indonesia

DOI: https://doi.org/10.24831/jai.v49i1.33626

Abstract

Rice is a major staple food in Indonesia. Some new upland rice varieties have been released and should be accompanied by accurate fertilization dosage at a specific location. One of the fertilizers is nitrogen (N). The objective of this research was to evaluate N use efficiency in upland rice variety IPB 9G as a response to N dose. The N doses were 0, 46, 92, 138, and 184 kg N ha^-1 (using urea 46% N). The experiment was conducted using a randomized complete block design with three replications in Darmaga, Bogor in March-July 2018. The plot size of each N dose was 3.5 m x 3.0 m. The N use efficiency was determined through rice growth, N uptake, agronomical and physiological efficiency. Plant height and tiller number increased followed the increase of N dose. The N uptake and grain yield had a quadratic response to the N dose which could be an indicator of the N fertilizing efficiency. The maximum N uptake and grain yield were achieved at an average of 143.8 kg N ha-1 (312.5 kg urea ha^-1). The recommendation of N fertilizing for soil with moderately N (0.27%) during the dry season was 143.8 kg N ha^-1 (312.5 kg urea ha^-1), as it is the most efficient dose in IPB 9G cultivation.

Keywords: agronomical efficiency, grain yield, N uptake, physiological efficiency