کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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6374461 | 1624670 | 2016 | 5 صفحه PDF | دانلود رایگان |
Breeding for yield has increased the concentration of reserve water-soluble carbohydrates (WSC) in wheat from dry, low yielding environments of Australia to wet, high-yielding environments of the UK. This generalized increase in WSC can reduce the concentration of nitrogen (N) in shoots and consequently reduce the crop critical N concentration (%Nc: the minimum concentration of N to achieve maximum growth rates). This may cause errors when assessing a crop's N status using N dilution curves which relate critical N concentration (%Nc) and shoot biomass (W), i.e. %Nc = aWâb. Inaccurate diagnosis of a crops N status will have negative environmental and economic consequences such as N losses to the environment and yield gaps. Here, we (i) outline the drivers of variation in WSC, (ii) discuss the implications of WSC on wheat N status, (iii) propose an adjustment of the theoretical N dilution framework that makes explicit a WSC compartment, and (iv) provide estimates of the range of error derived from the current two-compartment model.
Journal: Field Crops Research - Volume 193, July 2016, Pages 196-200