Fate of applied nitrogen in rice under full flood and delayed permanent water


Studies in the 1980s found that less than 50% of applied N fertiliser is taken up by drillsown rice crops in the Murray Irrigation Area, and crops relied heavily on native soil N. In the last decade, DPW has been promoted for water savings and crops reportedly have lower N fertiliser requirements. However, whether these lower N fertiliser requirements are a result of greater efficiency of uptake of applied fertiliser, or reflect greater mining of native soil N reserves is not known. This project will use a 15Nlabelled fertiliser source (urea) to quantify the recovery of fertiliser N in full flooded vs DPW systems to determine whether DPW systems are more efficient at recovering fertiliser N or whether they lead to greater uptake of native soil N. This study will have strong implications for sustainable N fertiliser use in the rice industry.



Research Organisation

Southern Cross University

Objective Summary

The objectives of the project are to: i) Determine the recovery of nitrogen (N) fertiliser (N use efficiency) and yield of rice grown under delayed permanent water (DPW)compared to a control full flood system using 15N isotope ii) Determine the reliance of DPW vs full flood systems on native soil N

Project Code


Project Stage


Project Start Date

Tuesday, July 15, 2014

Project Completion Date

Wednesday, September 30, 2015

Journal Articles From Project

Not Available

National Priority

Frontier technologies for building and transforming Australian industries

National Priority

Adoption of R&D

National Priority

RIC-Farm productivity - crop inputs, crop protection and the farming system