Effects of Nitrogen Application Rate on Fractionation of Soil Organic Nitrogen Relative to Crop Rotation Mode

doi:10.11766/trxb201706230077

Home > Archive>Volume 54, Issue 6, 2017 >1547-1558. DOI:10.11766/trxb201706230077

Effects of Nitrogen Application Rate on Fractionation of Soil Organic Nitrogen Relative to Crop Rotation Mode
DOI:
                        10.11766/trxb201706230077
                    
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                        JIA QianJIA Qian
College of Resource and Environment, Huazhong Agricultural University, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture
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LIAO ShipengLIAO Shipeng
College of Resource and Environment, Huazhong Agricultural University, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture
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BU RongyanBU Rongyan
College of Resource and Environment, Huazhong Agricultural University, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture
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ZHANG MengZHANG Meng
College of Resource and Environment, Huazhong Agricultural University, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture
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REN TaoREN Tao
College of Resource and Environment, Huazhong Agricultural University, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture
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LI XiaokunLI Xiaokun
College of Resource and Environment, Huazhong Agricultural University, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture
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CONG RihuanCONG Rihuan
College of Resource and Environment, Huazhong Agricultural University, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture
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LU JianweiLU Jianwei
College of Resource and Environment, Huazhong Agricultural University, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture
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Fund Project:Supported by the National Natural Science Foundation of China (No. 41401324) and the Earmarked Fund for China Agriculture Research System（No. CARS-13）

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Abstract:

A 3 a field experiment, consisting of 6 croppings, was conducted to investigate effects of N fertilization on content and fractionation of soil organic N relative to N application rate and crop rotation mode, paddy/upland (rice/rapeseed, RR) rotation and upland (cotton/rapeseed, CR) rotation. Results show that after the 3 years of crop rotations cultivations, soil total N content in the 0~20 cm soil layer increased remarkably in plots more than 300 kg hm^-2 in N input. Compared with CK (No N fertilization, N0-0), soil total N content increased by 13.6%~23.5% and 15.0%~23.0%, respectively, in the treatments 300 kg hm^-2 and 375 kg hm^-2 in N application rate under either RR or CR rotation. The increase in soil total acidolysable N content accounted for most of the increase in soil total N. Although no significant difference in soil total acidolysable N content was observed between plots under RR and CR rotations, fractionation of the soil acidolysable N varied between plots. The proportion of soil acidolysable ammonium N increased by 33.8% in the plots under RR rotation, much lower than that (53.9%) in the plots under CR rotation, but the increment of unidentified soil acidolysable N in proportion was higher in plots under RR rotation (36.0%) than that (16.6%) in the plots under CR rotation. To sum up, reasonable N fertilization may significantly increase soil organic N content. Fractionation of the soil organic N pool varies sharply between plots under RR and CR rotations. It is, therefore, of important significance to optimize N fertilization for high crop yield and high N utilization efficiency in the light of the characteristics of soil organic N transformation under different rotation systems.

Key words:Nitrogen fertilizer; Paddy-upland rotation (RR); Continuous upland rotation (CR); Soil total N; Soil acidolysable nitrogen

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JIA Qian, LIAO Shipeng, BU Rongyan, ZHANG Meng, REN Tao, LI Xiaokun, CONG Rihuan, LU Jianwei. Effects of Nitrogen Application Rate on Fractionation of Soil Organic Nitrogen Relative to Crop Rotation Mode[J]. Acta Pedologica Sinica,2017,54(6):1547-1558.

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Received:March 02,2017
Revised:August 17,2017
Adopted:September 01,2017
Online: September 04,2017
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