title: [Relationships of water conservation through mulching in fallow period with wheat nitrogen transportation and crop yield in dryland].
abstract: Field experiments were carried out to study the effects of different mulching times (30 or 60 d after previous wheat harvest) and mulching methods (whole-mulching, half-mulching and no- mulching) on wheat plant N absorption and assimilation after deep plowing in fallow period on dryland. The results showed that mulching improved water storage efficiency in fallow period and soil water storage of 0-300 cm at sowing stage significantly. Mulching in fallow period, especially the whole-mulching, increased the N accumulation amount of each growth stage, N translocation amount and rate before anthesis (NABA) , and N accumulation amount after anthesis (NAAA) and grain N. Yield, N uptake efficiency (NUPE), N partial factor productivity (NPFP) and N harvest index (NHI) were all significantly increased under mulching, and whole-mulching had better effects. Mulching at 30 d after previous wheat harvest significantly increased the soil water storage of 0-300 cm at sowing stage and the water storage efficiency in fallow period compared with mulching at 60 d after previous wheat harvest. Compared with mulching at 60 d after previous wheat harvest, mulching at 30 d increased the N accumulation amount of each growth stage, the N accumulation amount in leaf and shoot at maturity, the NABA of stem + sheath, leaf and shoot and the yield. The soil water at the depth of 0-300 cm at sowing stage was positively correlated to N mobilization amount before anthesis and N accumulation amount after anthesis. The N mobilization amount of stem + sheath had a remarkable direct effect on its yield with the direct path coefficient of 0.619. In summary, mulching in fallow period increased the soil moisture at sowing stage to promote N absorption and utilization, increase yield and improve quality, and whole-mulching in advance had better effects.
authors.forename: Meng
authors.initials: M
authors.lastname: Zhang
authors.forename: Min
authors.initials: M
authors.lastname: Sun
authors.forename: Zhi-qiang
authors.initials: ZQ
authors.lastname: Gao
authors.forename: Hong-mei
authors.initials: HM
authors.lastname: Zhao
authors.forename: Guang
authors.initials: G
authors.lastname: Li
authors.forename: Ai-xia
authors.initials: AX
authors.lastname: Ren
authors.forename: Xing-yu
authors.initials: XY
authors.lastname: Hao
authors.forename: Zhen-ping
authors.initials: ZP
authors.lastname: Yang
mesh_terms: D000383:Agriculture / Q000379:methods*; D003247:Conservation of Natural Resources / Q000379:methods*; D002523:Edible Grain; D009584:Nitrogen / Q000032:analysis*; D018515:Plant Leaves; D018547:Plant Stems; D012987:Soil; D014908:Triticum; D014867:Water
chemical_list: D012987:Soil; D014867:Water; D009584:Nitrogen