New Zealand Journal of Agricultural Research abstracts
Establishment of legumes and grasses overdrilled into Hieracium
-infested montane tussock grasslands
R. F. WOODMAN*
W. L. LOWTHER
AgResearch
Invermay Agricultural Centre
Private Bag 50034
Mosgiel, New Zealand
R. F. HORRELL
Lincoln Ventures
P. O. Box 84
Lincoln University
Lincoln, New Zealand
R. P. LITTLEJOHN
AgResearch
Invermay Agricultural Centre
Private Bag 50034
Mosgiel, New Zealand
*Present address: 8 Beaconsfield Road, Portobello, Dunedin
Abstract The establishment of lotus (Lotus
corniculatus), alsike clover (Trifolium hybridum), cocksfoot
(Dactylis glomerata), and mountain brome (Bromus marginatus) were
compared following overdrilling by an experimental strip seeder and a
conventional triple disc drill in the presence and absence of paraquat
herbicide. Drilling was carried out in late August or in late January at two
sites on dry, undeveloped soils in the Mackenzie Basin, New Zealand. With
August sowing, the number of lotus, cocksfoot, and brome, but not alsike
seedlings at the end of the first growing season, were higher with the strip
seeder drill than with the triple disc drill. With January sowing, lotus,
alsike, and cocksfoot seedling numbers were higher with the strip seeder drill.
Numbers declined over the following four years but the advantage of the strip
seeder drill remained. Improved seedling nodulation, root development, root
length, and shoot length were recorded with the strip seeder drill. Drill
effects on legume herbage accumulation in Years 2-4 were not consistent. There
were no significant herbicide effects on seedling establishment in the first
growing season but herbicide increased legume herbage accumulation in Years
2-4, particularly with the triple disc drill. The higher seedling establishment
and enhanced early seedling growth indicate the potential of the strip seeder
drill technology particularly for establishing species with low seedling
vigour.
Keywords Overdrilling; Hieracium; legumes;
establishment; grasses; strip seeder drill; triple disc drill; herbicide;
tussock grasslands
New Zealand Journal of Agricultural Research, 1997, Vol. 40: 317-328
0028-8233/97/4003-0317 $7.00/0 (c) The Royal Society of New Zealand
1997
PDF file of entire paper: medium quality (860K); (scanned from paper original: notes about this process)
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