title: [Effects of coated controlled release urea combined with conventional urea on winter wheat growth and soil NO3- -N].
abstract: Field experiments were conducted to study the effects of different dosages coated controlled release urea (PCU60, 60 d release duration) combined with conventional urea (U) used as basal on the winter wheat grain yield, nitrogen (N) recovery rate, and soil NO3- -N content, etc. Five treatments were installed, i.e., U (CK), 10% PCU60+90% U (PU1), 20% PCU60+80% U (PU2), 30% PCU60+70% U (PU3), and 40% PCU60+60% U (PU4). In the meantime, a comparative analysis was also carried out on the PCU60 N release characteristics under field condition and in 25 "C static water. At the same N dosage, all the test indices in treatment PU4 were significantly higher, with the grain yield, N recovery rate, total N accumulation amount, total tiller number and aboveground biomass at ripening stage, and economic benefit increased by 5.6%, 14.6%, 7.2%, 2.6%, 7.5%, and 984.3 yuan x hm(-2), respectively, compared with those in treatment U. The accumulation amount of NO3- -N in 0-100 cm soil layer in all treatments ranged in 39.70-49.93 kg x hm-2, and was the lowest (39.70 kg x hm(-2)) in treatment PU4. The N release pattern of PCU60 under field condition better fitted the N absorption characteristics of winter wheat.
authors.affiliation: Institute of Plant Nutrition and Resources, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China. ywenping639@yahoo.com.cn
authors.forename: Wen-ping
authors.initials: WP
authors.lastname: Yi
authors.forename: Zhe
authors.initials: Z
authors.lastname: Sun
authors.forename: Liang
authors.initials: L
authors.lastname: Wu
authors.forename: Gui-fang
authors.initials: GF
authors.lastname: Shi
authors.forename: Guo-liang
authors.initials: GL
authors.lastname: Zhu
authors.forename: Ya-xing
authors.initials: YX
authors.lastname: Li
authors.forename: Jia-lin
authors.initials: JL
authors.lastname: Gu
authors.forename: Qiu-ming
authors.initials: QM
authors.lastname: Xu
mesh_terms: D000042:Absorption; D000383:Agriculture / Q000379:methods*; D018533:Biomass; D005308:Fertilizers; D009566:Nitrates / Q000032:analysis; D009584:Nitrogen / Q000032:analysis* / Q000378:metabolism; D012621:Seasons; D012987:Soil / Q000032:analysis*; D014908:Triticum / Q000254:growth & development* / Q000378:metabolism; D014508:Urea / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D005308:Fertilizers; D009566:Nitrates; D012987:Soil; D014508:Urea; D009584:Nitrogen