
TY  - JOUR
A1  - Palta, JA 
A1  - Fillery, IR 
T1  - Nitrogen accumulation and remobilisation in wheat of sup <sup>15</sup>N-urea applied to a duplex soil at seeding
JF  - Australian Journal of Experimental Agriculture
JO  - Aust. J. Exp. Agric.
Y1  - 1993
VL  - 33
IS  - 2
SP  - 233
EP  - 238
KW  - 
UR  - https://doi.org/10.1071/EA9930233 
N2  - Accumulation and remobilisation of 15N-labelled urea by wheat grown on a duplex soil at East Beverley, Western Australia, was investigated. 15N-urea was applied to microplots in a field experiment at 5.2 g N/m2 at seeding. The microplots were sampled at tillering, stem elongation, anthesis, and maturity. A maximum of 10.6 g N/m2 was accumulated by anthesis and no additional N was accumulated to maturity. Most N uptake occurred between tillering and stem elongation when plant N increased by 7 g/m2. Nitrogen loss of about 1.2 g/m2 occurred after anthesis. Post-anthesis remobilisation from the vegetative plant parts accounted for 69% of the N measured in the heads. Remobilisation from the straw of the mainstem and tiller 1, respectively, was 68 and 71% of the N measured in the heads. The balance of about 0.7 and 0.4 g N/m2for the mainstem and tiller 1 was presumably obtained from tiller 2 and 3, from which losses were 0.4 and 0.6 g N/m2, respectively. Recovery of 15N-labelled urea in the plant was 39% and the apparent efficiency of utilisation of the N fertiliser applied at seeding was 50%. These low recoveries in the plant indicate a need to improve N utilisation by wheat in duplex soils. 
ER  -

