Initial weed control in Douglas Fir nursery beds at Rangiora.

Authors: J. M. Balneaves
Publication: New Zealand Journal of Forestry, Volume N.Z.J.For. 1975, Issue N.Z.J.For. 20(1) 1975, pp 153-156, May 1975
Publisher: New Zealand Institute of Forestry

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Abstract: Trials at Rangiora Nursery showed that weed control in Douglas fir nursery beds can be obtained by using nitrofen as a pre- and post-emergence herbicide The following treatment gave maximum weed control, without damaging the seedlings:
1.   Post-sowing/'pre-emergence application of paraquat at 0.6 kg in 225 litre water/ha.
2.   Pre-emergence (as first seedlings break soil surface) spray
with nitrofen at 7 kg in 225 litre water/ha.
3.   Repeat of (2) above when a fresh crop of weeds have ger
minated and have entered the first true-leaf stage.
Nitrofen gives a good kill of most newly-germinated weeds, but does not completely eradicate Lotus spp. Rates lower than 7 kg/ha do not appear to give adequate lasting control of Fumaria spp. or Polygonum aviculare, while rates of up to 16 kg/ha had no apparent adverse effect on Douglas fir seedlings.

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