Optimising tine weeding in organic pea crops

Dastgheib, F.

doi:10.30843/nzpp.2004.57.6940

Cited by 6 publications

(18 citation statements)

References 4 publications

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“…Comparing our results with reports based on qualitative experimental approaches, where one or two passes with a harrow are carried out at different growth stages, is not straightforward (Dastgheib, 2004;Ausˇkalnis & Ausˇkalnien_ e , 2008;Pardo et al, 2008;Velykis et al, 2009). To describe a treatment with a cultivator by the number of passes is more or less like describing a herbicidal treatment by the amount of herbicide used without information about the active ingredient.…”

Section: Discussioncontrasting

confidence: 52%

Timing of post‐emergence weed harrowing

2010

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Rasmussen J, Mathiasen H & Bibby BM (2010). Timing of post‐emergence weed harrowing. Weed Research50, 436–446. Summary The timing of post‐emergence weed harrowing was evaluated for two years in spring barley with crop‐weed selectivity and crop recovery as the key parameters measured. Selectivity describes the relationship between weed control and crop soil cover immediately after harrowing, with crop soil cover as the percentage of the crop that has been covered by soil due to harrowing. Crop recovery describes the relationship between crop yield loss and crop soil cover in the absence of weeds. Neither selectivity nor crop recovery was affected by timing within a period of two weeks in the early growth stages of spring barley. Selectivity was unaffected by year and 80% weed control was associated with crop soil cover in the range of 23–33%, for all combinations of year and growth stage. Crop recovery was affected by year, with an average crop yield loss of 3.5% caused by 25% crop soil cover in 2007 and complete recovery in 2008. A detailed study of crop growth and weed density in the period just after harrowing, showed that the recovery processes of crop and weeds were influenced by timing of harrowing, but this had no impacts on crop yield. In conclusion, timing of post‐emergence weed harrowing was not found to be crucial, given the condition that the aggressiveness of cultivation was adjusted to the growth stage.

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Section: Discussioncontrasting

confidence: 52%

Timing of post‐emergence weed harrowing

2010

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“…Pre-emergence harrowing was very effective against the early emerging tap-rooted species S. arvensis in the field experiment with peas at Enko¨ping in 2003. Koch (1959 reported similar results.…”

Section: Discussionmentioning

confidence: 74%

“…When pre-and post-wh was combined, it was possible to disturb the growth of both types of weed species at their most sensitive developmental stage (cotyledon stage). The importance of weed control timing in this respect was also shown by Dastgheib (2003), who observed that pre-wh in winter wheat sometimes provided satisfactory weed control, but a post-wh was required for late emerging weeds. Rasmussen and Rasmussen (1995) showed that with pre-wh in spring barley a reduction of 61% in weed dry weight was achieved, while a reduction of 74% was achieved when pre-and post-wh was combined.…”

Section: Discussionmentioning

confidence: 81%

“…Similarly, when a treatment does not affect yield at all, it may diminish the weed population. Dastgheib (2003) showed that pre-and post-emergence harrowing did not cause a yield loss in winter wheat, but reduced the weed cover, thereby contributing to the longer-term goal of reducing weed fecundity. The short-term effect of weed harrowing on resource competition between crop and weeds depends on the weed flora, the development stage of crop and weeds, soil type and fertility, weather and soil moisture content (Melander et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

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Effects of pre‐ and post‐emergence weed harrowing on annual weeds in peas and spring cereals

Lundkvist

2009

Weed Research

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Summary To assess the effects of timing and frequency of weed harrowing on weed abundance and crop yield, different pre‐ and post‐emergence weed harrowing sequences were applied to spring cereals and peas in field experiments performed during 2003 and 2004 in Sweden. Post‐emergence harrowing was performed at crop growth stages 2–3 and 5–6 true leaves respectively. The best weed control was obtained by a combination of pre‐ and post‐emergence harrowing, but these treatments also caused yield losses of 12–14% in spring cereals, while no yield losses were observed in peas. Pre‐emergence weed harrowing treatments alone or combined with weed harrowing shortly after crop emergence proved to be most effective against the early emerging annual weed species Sinapis arvensis and Galeopsis spp. Post‐emergence harrowing alone in peas had no effect on S. arvensis. The late emerging annual weed species Chenopodium album and Polygonum lapathifolium were most effectively controlled when pre‐emergence weed harrowing was combined with one or two weed harrowing treatments after crop emergence.

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“…This study was undertaken to compare different times and numbers of tine weeding in commercially grown organic wheat in central Canterbury. This report follows a previous paper (Dastgheib 2003) and summarises the results from three years of study.…”

Section: Introductionmentioning

confidence: 65%

Optimising tine weeding in organic wheat

Dastgheib¹

2004

NZPP

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Field trials were undertaken over three years to determine the effect of tine weeding in organic wheat (Triticum aestivum) crops in Canterbury The tine weeding treatments were performed either as single or repeated passes at different times of crop growth Preemergence tine followed by an early postemergence tine at the 3leaf stage gave the highest reduction (93) in weed biomass However grain yield of wheat was not significantly affected by tine weeding treatments in any of the experiments

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Optimising tine weeding in organic pea crops

Cited by 6 publications

References 4 publications

Timing of post‐emergence weed harrowing

Timing of post‐emergence weed harrowing

Effects of pre‐ and post‐emergence weed harrowing on annual weeds in peas and spring cereals

Optimising tine weeding in organic wheat

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