• Effect of different sources of nitrogen on yield and yield components of rice

  •   | 
  • 01/04/2016

This is the BSc thesis completed by Md. Abubakker Siddique at the Department of Agronomy and Agricultural Extension at the University of Rajshahi, Bangladesh.


Fertilization management of rice is becoming increasingly difficult due to climate change. At the same time it is important to manage nitrogen fertilization more effectively to ensure acceptable rice yields in the future.

In this research study different urea types, as nitrogen sources, were compared with the objective to identify the best source for local conditions at the study sites and ideal management options to enable local farmers to increase their rice yields.

An experiment was conducted in SAF-BIN project locations in the upazillas[1] Baraigram (Natore district), Paba (Rajshahi district) and Patnitala (Naogaon district), Bangladesh. The tested urea types were granular urea (GU) and urea super granule (USG) urea. A randomized complete block design with two replications was applied (plot size 6m x 4m). BINA dhan7, a short duration drought tolerant as well as drought escaping rice variety, was used. 25 days old seedlings were transplanted (3-4/ hill; spacing 20cm x 15cm), fertilized (180kg/ha urea, 75kg/ha TSP, 90kg/ha MOP, 60kg/ha gypsum) and if necessary pest management was applied. Data collected included: growth duration (days), productive tillers/hill, total grain weight/panicle (g/10m²) and yield (t/ha). Analysis of variance (ANOVA), mean differences (Duncan's new multiple range test) and correlation co-efficient of urea type and yield components was performed.

Growth duration varied significantly between locations (Paba 113.8 days; Patnitala: 110, Baraigram: 111.2) and urea type (GU: 111; USG: 112.3). Fertile tillers/hill varied significantly between locations (Paba: 15.6, Patnitala: 14.2, Baraigram: 17.4) and urea types (GU: 14.6; USG: 16.9). USG produced most tillers/hill in all locations. Total grain weight/panicle was significantly influenced by location (Paba 21.1g; Patnitala: 20.8g, Baraigram: 22.7g), urea type (GU: 21.4g; USG: 21.6g) and their interaction. Yield varied significantly urea type (GU: 4.5t/ha; USG: 4.96t/ha). Both urea types positively correlated with fertile tillers/hill but USG correlated higher than GU.

It can be concluded that USG has a greater impact on rice yield than GU and can be recommended to farmers in the study sites.

[1] a geographical region in Bangladesh used for administrative purposes, sub-units of districts. (Wikipedia, 2015: access date 19/10/2015.