title: [Effect of reduced N application on soil N residue and N loss in maize-soybean relay strip intercropping system].
abstract: A field experiment was conducted in 2012, including three planting pattern (maize-soybean relay strip intercropping, mono-cultured maize and soybean) and three nitrogen application level [0 kg N x hm(-2), 180 kg N x hm(-2) (reduced N) and 240 kg N x hm(-2) (normal N)]. Fields were assigned to different treatments in a randomized block design with three replicates. The objective of this work was to analyze the effects of planting patterns and nitrogen application rates on plant N uptake, soil N residue and N loss. After fertilization applications, NH4(+)-N and NO3(-)-N levels increased in the soil of intercropped maize but decreased in the soil of intercropped soybean. Compared with mono-crops, the soil N residue and loss of intercropped soybean were reduced, while those of intercropped maize were increased and decreased, respectively. With the reduced rate of N application, N residue rate, N loss rate and ammonia volatilization loss rate of the maize-soybean intercropping relay strip system were decreased by 17.7%, 21.5% and 0.4% compared to mono-cultured maize, but increased by 2.0%, 19.8% and 0.1% compared to mono-cultured soybean, respectively. Likewise, the reduced N application resulted in reductions in N residue, N loss, and the N loss via ammonia volatilization in the maize-soybean relay strip intercropping system compared with the conventional rate of N application adopted by local farmers, and the N residue rate, N loss rate and ammonia volatilization loss rate reduced by 12.0%, 15.4% and 1.2%, respectively.
authors.forename: Xiao-Ming
authors.initials: XM
authors.lastname: Liu
authors.forename: Tai-Wen
authors.initials: TW
authors.lastname: Yong
authors.forename: Wen-Yu
authors.initials: WY
authors.lastname: Liu
authors.forename: Ben-Ying
authors.initials: BY
authors.lastname: Su
authors.forename: Chun
authors.initials: C
authors.lastname: Song
authors.forename: Feng
authors.initials: F
authors.lastname: Yang
authors.forename: Xiao-Chun
authors.initials: XC
authors.lastname: Wang
authors.forename: Wen-Yu
authors.initials: WY
authors.lastname: Yang
mesh_terms: D000383:Agriculture / Q000379:methods*; D018556:Crops, Agricultural; D005308:Fertilizers; D009584:Nitrogen / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D013025:Glycine max / Q000254:growth & development*; D003313:Zea mays / Q000254:growth & development*
chemical_list: D005308:Fertilizers; D012987:Soil; D009584:Nitrogen