Details

Autor(en) / Beteiligte

• Yang, Xianlong
• Lu, Yongli
• Ding, Yan
• Yin, Xiaofang
• Raza, Sajjad
• Tong, Yan’an

Titel

Optimising nitrogen fertilisation: A key to improving nitrogen-use efficiency and minimising nitrate leaching losses in an intensive wheat/maize rotation (2008–2014)

Ist Teil von

• Field crops research, 2017-05, Vol.206, p.1-10

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Crop yields increased quadratically and NUE decreased linearly with increasing N application rates.•Nitrate residue and annual nitrate-leaching loss increased exponentially with increasing N application rates.•N-application rates of 150–170 and 180–200kgNha−1 are respectively recommended for wheat and maize.•High crop yields can be obtained at the optimal N application rates with low environmental risks. Optimising nitrogen (N) fertilisation is critically important for obtaining high crop yields with low environmental costs. A seven-year field experiment was conducted to evaluate the effects of the rate of N application on crop yield, N-use efficiency (NUE), nitrate residue (NR), and nitrate leaching in an intensive wheat/maize rotation system on the Loess Plateau of China. Five treatments were tested: a control (no N fertilisation) and conventional, low, moderate, and high rates of N fertilisation. Nitrates were leached mainly after heavy rains and with flood irrigation and varied notably between years. Annual nitrate-leaching loss (ANLL) averaged 3.4–17.3kgNha−1y−1 at N rates of 165–495kgNha−1. Crop yields increased quadratically and NUE decreased linearly with increasing rates of N application. NR and ANLL increased exponentially. Compared with conventional management, moderate N fertilisation increased NUE and decreased NR and ANLL by 46 and 34%, respectively, without any significant decrease in crop yield. High yields can thus be achieved at a moderate N rate and an economically optimal N rate with less ANLL and acceptable soil NR. We recommend N-application rates of 150–170 and 180–200kgNha−1 for wheat and maize, respectively, for obtaining high crop yields with low environmental risks.