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RESEARCH ARTICLE

Tracking fertiliser and soil nitrogen in irrigated cotton: uptake, losses and the soil N stock

B. C. T. Macdonald A C , Y. F. Chang B , A. Nadelko B , S. Tuomi A and M. Glover A
+ Author Affiliations
- Author Affiliations

A CSIRO Agriculture and Food, Black Mountain, Canberra, ACT 2601, Australia.

B CSIRO Agriculture and Food, Australian Cotton Research Institute, Narrabri, NSW 2390, Australia.

C Corresponding author. Email: ben.macdonald@csiro.au

Soil Research 55(3) 264-272 https://doi.org/10.1071/SR16167
Submitted: 22 June 2016  Accepted: 30 September 2016   Published: 8 November 2016

Abstract

This paper explores the importance of the N loss pathways relative to the immobilisation and soil mineral N supply during a cotton season. Despite using an agronomic practice of splitting urea application to reduce losses and an optimal rate (232 kg urea-N ha–1) for the experiment, the average fertiliser recovery was 32%, which indicates that soil N mineralisation is a key source of N for irrigated cotton production systems. A large amount of the fertiliser (62 kg N ha–1) was immobilised in the soil at the end of the season and during the season the soil supplied 159 kg N ha–1 to the plant via mineralisation. During the season, large N losses occurred from the field via the atmospheric, deep drainage and surface run-off pathways (143 kg N ha–1). The losses occurred directly after fertilisation, predominantly at the start of the season when the majority of the urea fertiliser was applied (180 kg urea-N ha–1). This indicates that the form, placement and timing of the fertiliser did not synchronise with soil and crop N dynamics and irrigation practice. Over the course of the measurement season, based on the N inputs, losses and storage budget, a 42 kg N ha–1 soil deficit was observed. Further longer term work is required to quantify the magnitude and significance of the soil N stock across different systems.


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