+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Optimum weed removal timing in drilled salad onions and transplanted bulb onions grown in organic and conventional systems



Optimum weed removal timing in drilled salad onions and transplanted bulb onions grown in organic and conventional systems



Biological Agriculture & Horticulture 16(2): 191-201



In field experiments with drilled salad onions, a single weeding made at 4 weeks after 50% crop emergence was sufficient to prevent significant yield loss due to weeds. Weed removal 5 or 6 weeks after 50% crop emergence was generally unsuccessful in averting crop losses. It is well known that the relative timing of crop and weed emergence is important in determining the balance of crop-weed interactions. In the present experiments, the pattern of crop and weed emergence varied between sites and years but the removal of early emerging weeds, at 4 weeks after 50% crop emergence, avoided weed interference consistently. In the transplanted bulb onion experiments, the crop began with an advantage over the weeds, and a single weeding made at 5, 6 or 7 weeks after planting was effective in preventing a reduction in yield. There was no difference in response between crops grown organically and those grown conventionally. Yield loss was due mainly to weed competition occurring prior to handweeding or mechanical injury to the crop following late or repeated weed removal. In the conventional crop, a single weeding that removed inter-row weeds but left within-row weeds in place gave yields little better than those of the unweeded crop.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 003221005

Download citation: RISBibTeXText

DOI: 10.1080/01448765.1998.9755231


Related references

Preliminary experiments on weed control with hydroxy benzonitrile formulations in salad onions m and bulb onions m. Bawden, Sir Fredrick (President) Proceedings Of The 9th British Weed Control Conference Held Nov 18-21, at Brighton, England Symposium Xv+532 (Vol 1); Xxii+533-1045p (Vol 2); Vi+1053-1368p (Vol 3) Illus 344-349, 1968

Timing the removal of weeds from drilled salad onions to prevent crop losses. Crop Protection 15(2): 205-211, 1996

Changes in the weed seedbank following different weeding treatments in drilled salad onion and carrot crops grown in organic and conventional systems. Biological Agriculture & Horticulture 16(2): 203-215, 1998

Changes in the weed seedbank following different weed control treatments in transplanted bulb onions grown organically and conventionally. Aspects of Applied Biology ( 51): 273-278, 1998

Preliminary experiments on weed control with hydroxybenzonitrile formulations in salad and bulb onions. Proc. 9th Brit. Weed Control Conf, 344-9. bibl. 3, 1968

Mechanical in-row weed control in transplanted and direct-sown bulb onions. Biological Agriculture and Horticulture 25(3): 235-251, 2008

Chemical weed control in onions (drilled, grown from sets and trasplanted) and leeks, 1968-1974. Forskning Og Forsok i Landbruket 7(1): 85-110, 1976

The effect of weed removal at different times on the yield of bulb onions. Journal of Horticultural Science 46: 4, 471-483, 1971

The control of white rot sclerotium cepivorum in fluid drilled salad onions. Journal of Horticultural Science 56(3): 251-254, 1981

The effect of irrigation systems and timings on the activity of linuron at 0.75 and nitrofen at 1.5 kg a.i./ha for weed control in transplanted onions. Asociacion Latinoamericana de Malezas "ALAM" [y] Sociedad Colombiana de Control de Malezas y Fisiologia Vegetal "COMALFI" Resumenes de los Trabajos en el II Congreso ALAM y VI Seminario, COMALFI, Cali, 1974: ; 98, 1974

Pre- and post-em. weed control in drilled onions. Proceedings of the 11th British Weed Control Conference: 173-179, 1972

Pre- and post-emergence weed control in drilled onions. 1972

The development of weed control programmes in drilled onions. Proc. 21st N.Z. Weed Pest Control Conf, 17-23. Bibl. 7, 1968

Post-emergence weed control in drilled onions. Proceedings of the Tenth British Weed Control Conference, 210-215, 1970

The effect of time of planting and of bulb size on the yield of salad onions from three onion cultivars. Informatore Agrario 43(18): 93-99, 1987