Wheat crop surveys in southern New South Wales. 4. The response by grain yield and other wheat attributes to weeds.
1986
Taylor A.C. | Lill W.J.
At wheat flowering, over all sites, wheat DM, N concentration, N uptake, P uptake and number of ears were inceased by 11.2, 3.3, 14.4, 13.6 and 7.8 percent, respectively, by weeding; wheat P concentrations did not respond to weeding. At maturity, grain yield and nitrogen yield increased after weeding by 17.3 and 17.0 percent, respectively, but grain protein and kernel weight did not respond to weeding. At flowering, for every 100 g of DM removed, wheat DM, N uptake, P uptake and ear number increased by 52.3g, 958mg, 92.6mg and 18.7 per sq m respectively. At maturity, grain yield and grain N yield increased by 31.9 and 665 mg per sq m, respectively, for every 100 g per sq m of weed DM present at flowering. At both flowering and maturity, fumitory, annual grasses and sundry weeds (a group made up of weeds not sufficiently widespread to consider separately) appeared to be the most aggressive weeds. Consideration of standardised responses of the wheat attributes increased by weeding showed that they all responded similarly when corrected for scale of measurement.
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