NDSS Lookup Table for Northern Irrigation Region (compiled by Geoff Mundy)

Average N response (kgDM/kgN)
Pasture Index Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Ryegrass Low 6 6 6 6 4 4 8 8 9 6 6 6
Ryegrass Medium 8 8 9 9 5 5 10 10 13 9 9 8
Ryegrass High 9 10 11 10 7 5 15 15 20 15 10 10
 Response Time (days) 21-30 21-30 21-30 28-36 28-42 60-90 60+ 30-40 21-30 18-24 21-28 21-28
Paspalum dominant 20 20 9 6 5 4 5 10 11 12 13 15
Response Time (days) 17-21 17-21 21-30 28-36 28-42 60-90 60+ 30-40 21-30 18-24 17-21 17-21
Notes Ryegrass Clover Olsen P Colwell K & pH Other notes
Ryegrass Low = < 30% >50% < 12 ppm K & pH not
usually an issue
Summer weeds eg sedge
Ryegrass High = > 60 % 20-40% > 25 ppm  
Paspalum dominant = < 30% 10-30%    
Comments:
Good late autumn rains may increase response of ryegrass in late autumn (irrigations often stopped in late April)
Responses need to be adjusted within the range given, based on rainfall and temperature for the current season.
Responses are for average responses to nitrogen applied early in the month and responses measure late in the same month
Short regrowth times (eg 14-16 days) may reduce responses
Good surface drainage reduces waterlogging after flood irrigation
July response can be similar to August with 60+ days response time - reduce response by 50% with 30 days response time

Data from a completed project funded by DPI and the Dairy Research & Development Corporation

Go To Home Page

Last modified:16 August, 2004                         Please Note: Disclaimer             Authorised and maintained by: Richard Eckard
Copyright 1997-1999, The University of Melbourne.