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• W2751522012 abstract "Irrigation and nitrogen (N) fertilization in excess of crop requirements are responsible for substantial nitrate accumulation in the soil profile and contamination of groundwater by nitrate leaching during intensive agricultural production. In this on-farm field trial, we compared 16 different water and N treatments on nitrate accumulation and its distribution in the soil profile (0–180 cm), nitrate leaching potential, and groundwater nitrate concentration within a summer-maize (Zea mays L.) and winter-wheat (Triticum aestivum L.) rotation system in the Huang-Huai-Hai Plain over five cropping cycles (2006–2010). The results indicated that nitrate remaining in the soil profile after crop harvest and nitrate concentration of soil solutions at two depths (80 cm and 180 cm) declined with increasing irrigation amounts and increased greatly with increasing N application rates, especially for seasonal N application rates higher than 190 kg N ha− 1. During the experimental period, continuous torrential rainfall was the main cause for nitrate leaching beyond the root zone (180 cm), which could pose potential risks for contamination of groundwater. Nitrate concentration of groundwater varied from 0.2 to 2.9 mg L− 1, which was lower than the limit of 10 mg L− 1 as the maximum safe level for drinking water. In view of the balance between grain production and environmental consequences, seasonal N application rates of 190 kg N ha− 1 and 150 kg N ha− 1 were recommended for winter wheat and summer maize, respectively. Irrigation to the field capacity of 0–40 cm and 0–60 cm soil depth could be appropriate for maize and wheat, respectively. Therefore, taking grain yields, mineral N accumulation in the soil profile, nitrate leaching potential, and groundwater quality into account, coupled water and N management could provide an opportunity to promote grain production while reducing negative environmental impacts in this region." @default.
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• W2751522012 date "2018-01-01" @default.
• W2751522012 modified "2023-10-17" @default.
• W2751522012 title "Nitrate accumulation and leaching potential reduced by coupled water and nitrogen management in the Huang-Huai-Hai Plain" @default.
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• W2751522012 doi "https://doi.org/10.1016/j.scitotenv.2017.08.127" @default.
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