NDSS Lookup Table for Western Victoria (compiled by Frank McKenzie)

Average N response (kgDM/kgN)
Pasture Index Jan* Feb* Mar* Apr May Jun Jul Aug Sep Oct Nov* Dec*
Low ** ** ** 5 5 4 4 7 8 8 ** **
Medium 9 9 9 8 7 5 5 8 14 14 11 11
High 14 14 14 10 9 8 8 12 20 20 15 15
Typical Response Time (days) 21-32 21-32 25-35 28-36 28-42 36-90 21-32 18-28 14-28 14-21 14-28 18-32
Notes Ryegrass Olsen P Colwell K pH (H2O)
Low = < 30% < 12 ppm < 80 ppm <4.5
High = > 60 % > 25 ppm > 275 ppm >5.5
Comments:
* = Assumes irrigation, as summer rainfall in SW Victoria (Nov - Mar) is often too unreliable to allow for N applications
** = would not irrigate low potential pasture
Responses need to be adjusted within the range given, based on rainfall and temperature for the current season.
Responses are quote for average responses to nitrogen applied early in the month and responses measure late in the same month
Summer nitrogen responses are highly dependent on adequate soil moisture, usually only adequate with irrigation
Short regrowth times (eg 14-16 days) may reduce responses

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

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