caa a22 4500 463209281 CHVBK 20180405153135.0 cr unu---uuuuu 170326e20071101xx s 000 0 eng 10.1007/s10705-007-9112-8 doi (NATIONALLICENCE)springer-10.1007/s10705-007-9112-8 Nitrogen input, 15N balance and mineral N dynamics in a rice-wheat rotation in southwest China [Elektronische Daten] [Mingsheng Fan, Shihua Lu, Rongfeng Jiang, Xuejun Liu, Xiangzhong Zeng, Keith Goulding, Fusuo Zhang] A field experiment and farm survey were conducted to test nitrogen (N) inputs, 15N-labelled fertilizer balance and mineral N dynamics of a rice-wheat rotation in southwest China. Total N input in one rice-wheat cycle averaged about 448kg Nha−1, of which inorganic fertilizer accounted for 63% of the total. The effects of good N management strategies on N cycling were clear: an optimized N treatment with a 27% reduction in total N fertilizer input over the rotation decreased apparent N loss by 52% and increased production (sum of grain yield of rice and wheat) compared with farmers' traditional practice. In the 15N-labelled fertilizer experiment, an optimized N treatment led to significantly lower 15N losses than farmers' traditional practice; N loss mainly occurred in the rice growing season, which accounted for 82% and 67% of the total loss from the rotation in farmers' fields and the optimized N treatment, respectively. After the wheat harvest, accumulated soil mineral N ranged from 42 to 115kgha−1 in farmers' fields, of which the extractable soil NO3 −-N accounted for 63%. However, flooding soil for rice production significantly reduced accumulated mineral N after the wheat harvest: in the 15N experiment, farmers' practice led to considerable accumulation of mineral N after the wheat harvest (125kgha−1), of which 69% was subsequently lost after 13days of flooding. Results from this study indicate the importance of N management in the wheat-growing season, which affects N dynamics and N losses significantly in the following rice season. Integrated N management should be adopted for rice-wheat rotations in order to achieve a better N recovery efficiency and lower N loss. Springer Science+Business Media B.V., 2007 Alternate soil wetting and drying nationallicence Integrated nutrient management nationallicence 15N labelled Urea nationallicence Nitrogen budget nationallicence Nitrogen cycling nationallicence Rice-wheat cropping system nationallicence N : Nitrogen nationallicence R-W : Rice-wheat nationallicence TRF : Farmers' traditional nitrogen practice nationallicence OPT : Optimized nitrogen treatment nationallicence BNF : Biological N2 fixation nationallicence Nmin : Mineral nitrogen nationallicence Fan Mingsheng Department of Plant Nutrition, China Agricultural University, 100094, Beijing, China aut Lu Shihua Institute of Soils and Fertilizers, Sichuan Academy of Agricultural Sciences, 610066, Chengdu, China aut Jiang Rongfeng Department of Plant Nutrition, China Agricultural University, 100094, Beijing, China aut Liu Xuejun Department of Plant Nutrition, China Agricultural University, 100094, Beijing, China aut Zeng Xiangzhong Institute of Soils and Fertilizers, Sichuan Academy of Agricultural Sciences, 610066, Chengdu, China aut Goulding Keith Agriculture and Environment Division, Rothamsted Research, AL5 2JQ, Harpenden, Hertfordshire, UK aut Zhang Fusuo Department of Plant Nutrition, China Agricultural University, 100094, Beijing, China aut Nutrient Cycling in Agroecosystems Springer Netherlands 79/3(2007-11-01), 255-265 1385-1314 79:3<255 2007 79 10705 https://doi.org/10.1007/s10705-007-9112-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10705-007-9112-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fan Mingsheng Department of Plant Nutrition, China Agricultural University, 100094, Beijing, China aut NATIONALLICENCE 700 1- Lu Shihua Institute of Soils and Fertilizers, Sichuan Academy of Agricultural Sciences, 610066, Chengdu, China aut NATIONALLICENCE 700 1- Jiang Rongfeng Department of Plant Nutrition, China Agricultural University, 100094, Beijing, China aut NATIONALLICENCE 700 1- Liu Xuejun Department of Plant Nutrition, China Agricultural University, 100094, Beijing, China aut NATIONALLICENCE 700 1- Zeng Xiangzhong Institute of Soils and Fertilizers, Sichuan Academy of Agricultural Sciences, 610066, Chengdu, China aut NATIONALLICENCE 700 1- Goulding Keith Agriculture and Environment Division, Rothamsted Research, AL5 2JQ, Harpenden, Hertfordshire, UK aut NATIONALLICENCE 700 1- Zhang Fusuo Department of Plant Nutrition, China Agricultural University, 100094, Beijing, China aut NATIONALLICENCE 773 0- Nutrient Cycling in Agroecosystems Springer Netherlands 79/3(2007-11-01), 255-265 1385-1314 79:3<255 2007 79 10705 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer